instructor guide - transit training · in your own words: instructor’s notes ppt slide 2 5 module...

Instructor Guide

220: Elevator: Other SystemsModule 2: Dumbwaiters

Elevator – Other Systems Dumbwaiters Instructor’s Guide

Table of Contents

1

Overview……………………………………………………………………………………………..…..……....4 Types & Components…………………………………………………………………………………………10 Basic Operation………………………………………………………………………………………………. 20 Drive Systems………………………………………………………………………………………………….22 Maintenance……………………………………………………………………………………………………26 Safety and Weight Capacity…………………………………………………………………………………36 Common Faults & Troubleshooting………………………………………………………………………..37 Summary………………………………………………………………………………………………………..41

Elevator – Other Systems Dumbwaiters Instructor’s Guide Icons Used In This Guide Agenda

Topic # Topic Title Duration

Total Time:

2

1

2

3

4

5

Overview

Types & Components

Basic Operation

Drive Systems

Maintenance

10 minutes

20 minutes

5 minutes

10 minutes

15 minutes

10 minutes

Summary

Safety & Weight Capacity Common Faults & Troubleshooting

6

7

8

5 minutes

90 minutes

15 minutes

Elevator – Other Systems Dumbwaiters Instructor’s Guide

Overview Purpose The purpose of this module is to:

Objectives At the end of this lesson, the transit elevator/escalator trainee will be able to:

Materials Mandatory Make sure you have the following

Optional You may also want the following for optional activities:

3

Provide the participant with basic information about dumbwaiter systems as related to previous knowledge of basic elevator systems.

• PowerPoint Presentation • Coursebook • Quizzes • Pencils

• Chalk board with chalk, large paper with marker, etc.

• Internet connection • Lab, simulator or out of service elevator • Authority specific procedures if applicable • ASME Code A17.1 • Time for a field visit if applicable

• Identify safety procedures for dumbwaiters. • Identify major components of dumbwaiters. • Describe the basic operation of dumbwaiters. • Identify troubleshooting procedures and common faults

specific to dumbwaiters • Identify maintenance requirements specific to

dumbwaiters. • Identify code requirements specific to dumb waiters. • Describe weight limitations of dumbwaiters.

Elevator – Other Systems Dumbwaiters

DO SAY Materials Needed

Instructor’s Guide

In your own words:

Instructor’s Notes

4

Module Length: 90 min Time remaining: 90 min This section: 10 min ( 5 slides) Section start time: ________ Section End Time: ________

Welcome to the course on Elevator Other Systems Dumbwaiters. Advance

PPT slide 1 REVIEW introduction slides




In your own words:


5


This is not exactly the type of waiter we are going to discuss today, but they do illustrate early versions of what the dumbwaiter was intended to be used for. A dumbwaiter is a small elevator system that moves smaller quantities or lighter weighted materials from one floor to another in a building. In transit, these systems are typically found in warehouses or storerooms and not intended for public use or the movement of people. DO NOT ADVANCE

PPT slide 2 REVIEW slide

Multimedia

Internet connection




In your own words:


6


[Multi-media: Click on each illustration to link to an early dumbwaiter. The tray illustration will display a view of a typical an early European dumbwaiter, and the penguin will link to a photo of a later, more developed , and one of the earliest American dumbwaiters used to move wine at Thomas Jefferson’s home in Virginia.] This module will explore some of the key features and topics to know regarding dumbwaiters.


Internet connection

Multimedia




In your own words:


7


Today we will - Identify safety procedures for dumbwaiters. - Identify major components of dumbwaiters. - Describe the basic operation of dumbwaiters. - Identify troubleshooting procedures and common faults specific to dumbwaiters - Identify maintenance requirements specific to dumbwaiters. - Identify code requirements specific to dumb waiters. - Describe weight limitations of dumbwaiters. Ad

PPT slide 3 REVIEW module objectives




In your own words:


8


Lets take a look at some of the key words we will be defining as move through this module: Horizontal Bi-parting Doors Dumbwaiter Make up interlock Mini-traction Winding drum Advance

PPT slide 4 REVIEW key terms




In your own words:


9

PPT slide 5 Thinking back to other courses or just in general, What might you know about dumbwaiters used in transit today? [Allow participants to think for a minute and perhaps discuss with a partner ideas as well as write down any ideas. Discuss participant responses and if possible list them on a chalk board or similar.] Advance


ASK participants what they know about dumbwaiters

SMALL GROUP ACTIVITY

WRITE

Large Paper or chalk board




In your own words:


10

PPT slide 6 There are three basic types of dumbwaiters: traction, hydraulic, and winding drum. Transit industries tend to utilize traction and winding drum type dumbwaiters. Traction dumbwaiters usually service high rise buildings as they have no travel limitations and can travel at faster speeds as compared to winding drum dumbwaiters which tend to be used for low-rise buildings and needs. In some instances, these traction dumbwaiter systems have been referred to as “mini-traction” elevators because of the similarities to their larger counterpart, the electric traction elevator. Advance

REVIEW slides

Module Length: 90 min Time remaining: 80 min This section: 20 min (12 slides) Section start time: ________ Section End Time: ________




In your own words:


11

PPT slide 7 Most dumbwaiters in transit are a geared traction system which means the components are really very much the same. [Ask: What are the components in gear traction system? Allow participants to provide answers. Record their answers on a chalk board or similar if possible. Advance for complete list.] Major components in these systems include: Brake Cable or Ropes Call Buttons Car Controller Counterweight Deflector Sheave Continued on Next Page

REVIEW slides


ASK





In your own words:


12

PPT slide 7 Door Frame Doors Geared Hoisting Machine Hatch Door Hoistway Hoistway light Motor Pit Pit light Rail Lubricator Rails Retiring Cam Safety Slack Cable Switch Travelling Cable Advance

REVIEW slides


ASK





In your own words:


13

PPT slides 8, 9 These components are the same as a typical geared traction elevator system except the wire rope is two-ended with one side ending at the machine and the other ending at the counter weight. Also like a larger geared traction elevator system, the motor in a dumbwaiter is a three phase AC motor. Advance Here is a photo of a four cable dumbwaiter system in WMATA. You can see the deflector sheave and motor in the hoistway. Advance

REVIEW slides





In your own words:


14

PPT slides 10, 11 Doors in a dumbwaiter can be either center opening (also sometimes known as bi-parting) or side opening. Unlike a typical elevator, doors are generally manually opened via chains above the doors and a handle on the outside doors. The dumbwaiter data plate containing specific information regarding each particular system is located above the door. Advance Here is a photo of a four cable dumbwaiter system in WMATA. You can see the deflector sheave and motor in the hoistway. Advance

REVIEW slides





In your own words:


15

PPT slides 12, 13 Here is a photo of a four cable dumbwaiter system in WMATA. You can see the deflector sheave and motor in the hoistway. Advance Although not as common, another type of dumbwaiter found in transit may be a Winding Drum dumbwaiter. This is similar to the geared traction type and contains the same components except the cable is attached to a drum which then attaches to the motor. This drum can be located in the machine room, near pit, or is found in the hoistway. Advance

REVIEW slides





In your own words:


16

PPT slide 14 Here is a photo of a winding drum dumbwaiter system in WMATA. Buffers, while not listed with the previous components, are sometimes found in dumbwaiter systems, as seen in this photo as well. Advance

REVIEW slide





In your own words:


17

PPT slide 15 Lets see what we have learned so far: Components in a dumbwaiter system are nearly identical to those in a _______________ elevator system. a. hydraulic b. traction c. rack-and-pinion d. inclined platform lift Call on participants for answer Advance once given the correct answer Answer: b. Advance


ASK




In your own words:


18

PPT slide 16 Two most common types of dumbwaiter systems in transit include (check all that apply) a. hydraulic b. traction c. winding drum d. rack-and-pinion Call on participants for answer Advance once given the correct answer Answer: b., c. Advance


ASK




In your own words:


19

PPT slide 17 In a winding drum dumbwaiter system, the winding drum can be found in the a. top of hoistway b. machine room c. pit d. car Call on participants for answer Advance once given the correct answer Answer: c. Advance


ASK




In your own words:


20

PPT slide 18 Once again, the basic operation of a dumbwaiter is similar to a standard elevator. Advance Someone wishing to use the dumbwaiter must first press call button. This button alerts the car to travel to the selected floor. Advance Doors must be closed in order for the car to move. If doors are open on any floor, the car will not move even if the call button is pushed. Advance Once all doors are closed, interlocks are made allowing the car to travel. Advance Some units have a retiring cam which unlocks the exterior door once the car arrives at the designated floor. There is a small DC motor on top of the car that operates the retiring cam. Continued - Advance

REVIEW slide





In your own words:


21

PPT slides 18, 19 Limit switches operate to keep the car from over-travelling. These switches are especially important when there is no buffer present or in very shallow pit areas. Advance A control system is also part of a dumbwaiter, and is similar to a standard traction elevator only smaller. Advance Here is a photo of a winding drum dumbwaiter system in WMATA. Buffers, while not listed with the previous components, are sometimes found in dumbwaiter systems, as seen in this photo as well. Advance

REVIEW slides





In your own words:


22

PPT slide 20 Drive control systems for dumbwaiters are usually comprised of a three phase AC motor or DC motors to operate the car and Advance a DC motor to turn the mechanism to return the retiring cam. Advance Brakes are included in the system as well. Advance Older systems use relay logic, but newer systems use solid state and PLCs to control to the electrical operation of the car. Advance Again, the operational control systems are similar to the standard electric traction only smaller Advance with the controller located near the dumbwaiter. Similar to a standard elevator system, a mainline disconnect switch will also be located next to the controller. Advance

REVIEW slide





In your own words:


23

PPT slides 21, 22 Here is a photo of a control panel and mainline disconnect in WMATA. You can see the control panel is just a smaller version of a standard electric traction controller. Advance Here is a photo from earlier of a motor in WMATA. You can see the motor is located in the hoistway, and in this case at the top of the hoistway. Advance

REVIEW slides





In your own words:


24

PPT slide 23 For a dumbwaiter system to work, the following must take place (check all that apply) a. doors closed b. interlocks engaged c. passenger steps into car d. hall call button pushed Call on participants for answer Advance once given the correct answer Answer: a., b., d. Advance


ASK




In your own words:


25

PPT slide 24 A dumbwaiter drive system includes (check all that apply) a. brakes b. relay or solid state technology c. small controller d. AC or DC motor e. Pinions Call on participants for answer Advance once given the correct answer Answer: a., b., c., d. Advance


ASK




In your own words:


26

PPT slide 25 Like other elevator systems, dumbwaiters must be maintained for proper function and effective use. Each transit authority keeps their own maintenance schedule and documentation for these systems. The following is a short review of the general maintenance procedures for dumbwaiters as well as an example maintenance schedule. However, this is only general and one should always follow authority specific maintenance schedules and procedures. To perform maintenance, first begin by making sure the opening and area around the dumbwaiter remains clear and this includes others as well. Bring the car to the top floor for service below, and bring the car to the lower floor for service and maintenance in the top of the hoistway. Advance

REVIEW slide





In your own words:


27

PPT slide 26 The process for this procedure is as follows: If car is already at your floor, then open the hoistway door. Use a non-conductive tool to make up the hoistway interlock, then use the other hand to press the call button to send the car away. Interlock could be on either side of the door, right adjusted or left adjusted. If the car is not there, bring it to where you are to open door, and then complete the same process. Again, if your transit authority utilizes and maintains dumbwaiters, be sure to follow your specific transit authority procedures for this process. Advance

REVIEW slide





In your own words:


28

PPT slide 27 When moving a dumbwaiter car to different floor for maintenance or inspection procedures, an important step not typical for most other elevator systems is to make up the interlock with the hoistway door open. This procedure can present several safety hazards and preventive safety measures include: Advance This is a recommended 2 person job Advance Know the pinch point locations Advance Ensure that limbs and loose clothing are all clear of the door movement Advance Make sure arm and/or tool does not extend beyond the sill Advance Secure all loose clothing, remove and store any rags and/or loose items from pockets Advance

REVIEW slide





In your own words:


29

PPT slides 27, 28 Advance Use non-conductive item Advance Remove cell phones, etc Advance Barricade and/or prevent access from other people and possible distractions Advance Here is a photo of the hoistway makeup interlock procedure. Advance

REVIEW slides





In your own words:


30

PPT slides 27, 28 Advance Use non-conductive item Advance Remove cell phones, etc Advance Barricade and/or prevent access from other people and possible distractions Advance Here is a photo of the hoistway makeup interlock procedure. Advance

REVIEW slides





In your own words:


31


Lets take a look at some maintenance procedures for dumbwaiter systems. You will need your coursebook and may want a pencil as well for this part. [Have participants turn to pages 24 – 25 in their coursebook. Review those pages together. If your transit authority has a dumbwaiter system, have participants note any transit authority specific procedures in the designated area in the course book.] Continued – Do Not Advance.


REFER participants to coursebook

coursebook Authority Specific

Procedures if possible

WRITE




In your own words:


32


Brakes – clearance and shoes should be check, pivot pins oiled, and cover cleaned. Controller – clean including fuses and holder, check timers, check for proper sequence, and start contactors, check and tighten terminal connections. Advance.





WRITE




In your own words:


33


For the exterior, check and lubricate rails, or check the oil container on top of car for adequate oil level, clean car top, and check leveling device. Check buttons, position indicators, switches, signs, and re-lamp as needed in the hallway corridor. Advance Check leveling, door gibs, and fastenings on the hatch door. Check worm gear oil, drive sheave for wear, and clean the area around the hoisting machine. Advance

PPT slides 30, 31 REVIEW slides




WRITE




In your own words:


34


In the hoistway, check car guides, traveling cable, and clean installation as needed. Clean and check bearings in the motor hoistway. Advance Clean and ensure lighting is efficient in the pit. Lubricate pivot points. Check for rail lubrication ensuring the oil container on top of car is full and wick is saturated and operable. Advance

PPT slides 32, 33 REVIEW slides




WRITE




In your own words:


35


Lubricate grease fittings on roller guides if present, and check ropes for wear, equalization, and fastening. Advance

PPT slides 34 REVIEW slides




WRITE




In your own words:


36


Overall, safety procedures for dumbwaiters are similar to those for other elevator systems. Additionally, and like other typical elevator systems, one must make sure power is turned off prior to maintenance and lockout/tagout is performed when needed. Weight capacity is typically manufacturer specific dependent on space and construction of car. [Refer participants to the ASME Code A17.1 and A17.2 for more information regarding dumbwaiters.] See A17.1 Sections 7 and A17.2 Section 7 for a detailed review of dumbwaiter code requirement. Advance


REFER participants to ASME Code A17.1 and A17.2 Sections 7

ASME Code A17.1, A17.2




In your own words:


37

PPT slide 36 Common faults include contact failure, door problems, dry rails, fuse problems, lack of power, load shift, safety activated, slack cable switch activated, and weather or accident problems. If your transit authority utilizes dumbwaiters in your system, please refer to your coursebook for a review and more information on troubleshooting these faults. Advance

REVIEW slide





In your own words:


38

PPT slide 37 Maintenance in a dumbwaiter system should always include (check all that apply) a. Making sure area is clear of people

and objects b. Bringing car to desired level c. Ensuring area around dumbwaiter is

clean d. Following all transit authority safety

procedures Call on participants for answer Advance once given the correct answer Answer: a., b., c., d. Advance


ASK




In your own words:


39

PPT slides 38, 39, 40 Describe the process and safety precautions for making up a dumbwaiter hoistway interlock. Call on participants for answer Advance once given the correct answer Answer: review next two slides Advance [Review previous slide.] Advance [Review previous slide.] Advance


ASK




In your own words:


40

PPT slide 41 Name at least three common faults in dumbwaiter systems. Call on participants for answer Advance once given the correct answer Possible Answers: Contact Failure, Door Problems, Dry Rails, Fuse Problems, Lack of Power, Load Shift, Safety Activated, Slack Cable Switch Activated, Weather or Accident Problems Advance


ASK




In your own words:


41

PPT slides 42, 43 [Read slide. For each objective, briefly review what was learned in this module or ask participants to share what they have learned for each learning objective and briefly discuss as a class.] Advance. Lets take a look at some of the key words we have defined as moved through this module. Read slide. Discuss definitions as a group. Advance.


CLASSROOM ACTIVITY




In your own words:


42

PPT slides 44 Administer quizzes.


CLASSROOM ACTIVITY Quizzes

Pencils

INDIVIDUAL ACTIVITY

instructor guide - transit training · in your own words: instructor’s notes ppt slide 2 5 module...

Documents