Siemens UL 489 - Preparation for Maintenance

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24 – 2

24.1 Preparation for maintenance

24.1.1 Opening the circuit breaker and discharging the closing spring

Fixed-mounted circuit breaker Draw-out circuit breaker

OPEN the circuit breaker

Disconnect secondary

circuits  (page 24-3)

CLOSE the circuit breaker

Depress the OPEN button

again

Indications

Position indicator

green

Secondary Circuit

Main Page

Default Chapter3
- Table of Contents3
1 Overview6
- Circuit Breaker6
- Cradle7
2 Labels8
- Circuit Breaker Frame Accessory Label8
- Circuit Breaker Frame Type Label8
- Frame Designation9
- Trip Unit Designation9
- Rating Plug Label10
- Cradle Type Label10
3 Standard Specifications11
4 Packing and Lifting12
- Unpacking12
- Weights12
- Lifting with a Crane13
- Lifting with a Lifting Bar Assembly14
  - Lifting Bar Assembly (3-Pole)14
  - Lifting the Circuit Breaker15
5 Installation16
- Mounting17
- Main Terminal Connections25
- Bus Connections to the Cradle41
- Secondary Wiring42
6 Commissioning49
- Preparation of Draw-Out Circuit Breaker49
- Charge the Closing Spring52
- Check List for Commissioning54
- Closing the Circuit Breaker55
- Opening the Circuit Breaker55
- Tripping56
- Reclosing a Circuit Breaker Tripped by the Trip Unit57
- Removing from Service59
- Troubleshooting60
7 Frame Sizes / Dimension Drawings62
- Frame Size I, Fixed-Mounted Version62
- Frame Size II, Fixed-Mounted Version67
- Frame Size II, 3000 a70
- Frame Size III, Fixed-Mounted Version71
- Door Cut-Outs, Fixed-Mounted Circuit Breaker75
- Frame Size I, Draw-Out Version77
- Frame Size II, Draw-Out Version82
- Frame Size III, Draw-Out Version86
- Door Cut-Outs for Draw-Out Circuit Breakers89
- External Sensor for Neutral Conductor91
- Further Dimension Drawings93
8 Circuit Diagrams94
- Terminal Assignment94
- Auxiliary Switches95
- Shunt Trip, Undervoltage Trip / Electrical Closing Lockout97
- Closing Coil / Electrical CLOSE98
- Motor-Operated Mechanism99
- Remote Bell Alarm Reset99
- Trip Unit Circuitry for ETU745-776100
9 Electronic Components103
- Trip Units103
- Cubiclebus Modules156
- External Voltage Supply200
- Handheld Test Device201
10 Reset the Reclosing Lockout and the Bell Alarm206
- Resetting the Bell Alarm206
- Resetting the Bell Alarm with Reclosing Lockout (Optional)207
- Field Installation of a Reclosing Lockout208
  - Removing the Automatic Reset Mechanism209
- Installing the Remote Bell Alarm Reset210
11 Shunt Trip / Closing Coil / Undervoltage Release213
- Overview213
- Installing Shunt Trips, Closing Coils, and Undervoltage Devices214
- Installing Optional Signaling Switches on Shunt Trips, Closing Coils, and Undervoltage Devices215
- Setting Delay Times on Undervoltage Release215
- Field Installation of a Cut-Off Switch for Shunt Trips and Closing Coils216
- Mechanical Function Test218
- Connecting Wires218
- Final Tasks219
- Electrical Function Test219
- Updating the Options Label221
12 Auxiliary and Control Switches223
- Installing Internal Auxiliary Switches S1 - S4224
- Installing the "Ready-To-Close" Switch S20225
- Trip Signaling Switches226
  - Trip Signaling Switches S13, S24, and S26227
- Control Switches - Connecting Wires228
- Communication Switches228
- Connecting Secondary Wiring228
- Updating the Options Label228
- Mechanism Operated Contacts (MOC)229
13 Motor-Operated Mechanism237
- Installing the Motor Operator237
- Optional Motor Disconnect Switch on the Front Panel239
- Updating the Options Label240
14 Indicators and Operating Elements241
- Limiting Access to OPEN/CLOSE Buttons241
- EMERGENCY OPEN Button243
- Operations Counter244
15 Locking Devices245
- Key Locks245
- Padlocking Provisions259
16 Sealing Covers267
17 Mechanical Interlocks268
- Field Installation of CLOSE / OPEN Buttons Blocking Device269
- Cubicle Door Interlock270
- Interlock to Prevent Racking with Cubicle Door Open278
- Coding between Circuit Breaker and Cradle279
18 Additional Options for the Cradle280
- Shutter280
  - Field Installation281
  - Catalog Numbers283
- Truck Operated Contacts - TOC (Cradle Accessory)284
19 Mechanical Circuit Breaker Interlocking287
- Configurations287
- Installing Interlocking Module294
20 Phase Barriers301
21 Arc Chute Covers302
- Field Installation302
- Catalog Numbers305
22 Door Sealing Frame306
23 Plexiglas Breaker Cover308
24 Maintenance310
- Preparation for Maintenance311
  - Opening the Circuit Breaker and Discharging the Closing Spring311
  - Removing the Circuit Breaker from the Cradle312
- Changing Front Panel313
  - Removing Front Panel313
  - Reinstalling the Front Panel313
- Checking Arc Chutes314
- Inspection of Arc Chute Covers317
- Checking Contact Erosion318
- Exchanging the Primary Disconnects320
- Cleaning and Greasing the Circuit Breaker325
- Cleaning and Greasing the Cradle325
25 Primary Injection Testing326
- General Notes327
- Primary Injection Phase Current Testing329
- Primary Injection Ground Fault Current Testing330
- Achieving Correct External Neutral Sensor Polarity332
26 Disposal334
- Low-Voltage Circuit Breakers Disposal334
27 Technical Data335
28 Abbreviations343
29 Glossary347
30 Index350

Siemens UL 489 - Preparation for Maintenance

Table of Contents

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