Siemens UL 489 - Installing the Ready-to-close Switch S20

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12 – 3

12.2 Installing the "Ready-to-close" switch S20

Snap-in mounting

The connecting wires from the "Ready-to-close" signaling switch must be connected to terminal X6 according to the wiring plan (page 8-2).

DANGER

Hazardous voltage.

Will cause death, serious personal injury, or equipment damage.

Turn off and lock out all power supplying this equipment before working on this device.

WARNING

High speed moving parts.

Can cause serious personal injury.

Discharge the closing spring before inspection and before carrying out any work on the circuit breaker.

Signaling switches Catalog No.

"Ready-to-close" signaling switch S20 WLRTCS

S20

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 - Installing the Ready-to-close Switch S20

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