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MicroVersaTrip AKR-75
Maintenance manual
GE AKR-75 Maintenance Manual
Low voltage power circuit breakers
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Also See for AKR-75
:
Installation instructions manual
(27 pages)
,
Installation instruction
(5 pages)
,
Manual
(63 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
SECTION 1-Lntroduction
Inspection and Maintenance
Renewal Parts
SECTION 2-General Description
Frame Size
Operation
Mounting
Trip Device
Short Circuit Ratings
SECTION 3-Storage, Safety and Maintenance
Storage
Safety
Maintenance
SECTION 4-Breaker Operation
Manual Closing
Electrical Closing
Alternate Control Circuit
Connections
Stationary Breaker
Drawout Breaker
Tripping
Charging and Closing Using the Maintenance Handle
SECTION 5-Contact Maintenance
Slow Closing the Breaker
Electrical Breaker
Manual Breaker
Arc Quencher Removal and Inspection
Removal and Replacement
Separation of Front and Back Frames
Back Frame Assembly
Measuring Contact Force
Stationary Arcing Contacts
Stationary Main and Intermediate Contacts
Measuring Contact Wipe
Adjusting Contact Wipe
Measuring Contact Open Gap
Checking Contact Sequence
Replacement of Contacts
Stationary Arcing Contacts
Movable Arcing Contacts
Movable Main and Intermediate Contacts
Stationary Intermediate and Main Contacts
Assembly and Adjustment of Crossbar
SECTION 6-Breaker Maintenance
Safety Precautions
Lubrication
Breaker Mechanism Adjustments
Trip Latch
Latch Buffer
Reset Latch Bearing and Prop
Electrical Mechanism
Control Components
Charging Motor
Motor Operator Unit
Table
Table
Spring Discharge Interlock
Manual Mechanism
Mechanism Part Replacement
Ratchet Pawl Replacement
Adjustments
Drawout Mechanism
Drawout Mechanism Lock
SECTION 7-Accessories
Primary Disconnects
Aka 75/100
Aks/Akst 50
Secondary Disconnects
Replacement
Auxiliary Switch
Replacement
Adjustments
Shunt Trip
Replacement
Adjustment
Undervoltage Device
Replacement
Adjustment
Static Time-Delay Undervoltage
Electric Lockout Device
Adjustment
Bell Alarm Device
Adjustment
Open Fuse Lockout Device
Coll Replacement
Adjustments
SECTION 8-Type SST Overcurrent
Programmer Unit
Current Sensors
Replacement of Current Sensors -AKS 50
Replacement of Current Sensors - AKA 75/100
Flux Shift Trip Device
Troubleshooting
SST Test Set
Resistance Values
Equipped with Ground Fault
SST Cabling Diagrams
SECTION 9-Type ECS Overcurrent Trip Device
ECS Cabling Diagram
Trip Device
Programmer Unit
Fault Trip Indicators
Remote Fault Indication
Microversatrip Installation
AKS 50 Installation
AKR 50/100 Installation
Current Sensors
Akr 751100
Flux Shift Trip Device
Troubleshooting
Aks50
Resistance Values
False Tripping-Breakers
Equipped with Ground Fault
Microversatrip TM Cabling Diagrams
SECTION 11-RMS-9/Epic Microversatrip
Fault Trip Indicators
Programmer Unit
Rms-9
Epic Microversatrip Installation
Current Sensors
Table 19
Flux Shifter Trip Device
Replacement of Current Sensors
Troubleshooting
Resistance Values
False Tripping-Breakers Equipped with Ground Fault
Cabling Diagrams
SECTION 12-Microversatrip
Plus and
Microversatrip PM Trip Units
Trip Unit
Read this First
Product Structure
Trip Unit Removal and Replacement
Phase Current Sensors
Neutral Current Sensors
Rating Plug Removal and Replacement
Trip Unit Functions
Trouble-Shooting Guide
SECTION 13-Type EC Overcurrent Trip Device
Direct Acting Tripping Device EC-1 B
Long Time Delay Tripping
Short Time Delay Tripping
Instantaneous Tripping - High Set
Instantaneous Tripping - Low Set
Replacement
Adjustments
Series Overcurrent Tripping Device EC-2A
Long Time-Delay and High Set
Instantaneous Tripping
Instantaneous Low Set Tripping
Instantaneous High Set Tripping
Serles Overcurrent Tripping Device EC-1
Short Time-Delay Tripping
Long Time-Delay Tripping
Instantaneous Tripping
Adjustment
Positive Trip Adjustment
Reverse Current Tripping Device
Adjustments
Replacements
Switchette Feature
Trip Device Replacement
SECTION 14-Electrical Characteristics
Charging and Closing Operating Currents
Beil Alarm Contact-Rating
Auxiliary Switch Contact Sequence
Auxiliary Switch Contact Ratings
Charging Times
Shunt Trip and Undervoltage Device
Coil Resistance
Instantaneous Undervoltage Device Settings
Time-Delay Undervoltage Device Settings
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Table of
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Table of Contents
Troubleshooting
Troubleshooting
56
AKR 751100
67
TABLE 19
77
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Summary of Contents for GE AKR-75
Page 1
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Page 2: Table Of Contents
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Page 3
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Page 4
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Page 5
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Page 6: Section 1-Lntroduction
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Page 7
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Page 8: Section 2-General Description
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Page 9: Mounting
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Page 10
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Page 11: Section 3-Storage, Safety And Maintenance
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Page 12: Section 4-Breaker Operation
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Page 13: Alternate Control Circuit
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Page 14: Connections
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Page 15: Tripping
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Page 16: Section 5-Contact Maintenance
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Page 17: Arc Quencher Removal And Inspection
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Page 18: Separation Of Front And Back Frames
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Page 19
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Page 20: Back Frame Assembly
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Page 21: Measuring Contact Force
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Page 22
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Page 23: Measuring Contact Open Gap
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Page 24: Checking Contact Sequence
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Page 25: Movable Main And Intermediate Contacts
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Page 26: Stationary Intermediate And Main Contacts
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Page 27: Assembly And Adjustment Of Crossbar
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Page 28: Section 6-Breaker Maintenance
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Page 29
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Page 30: Electrical Mechanism
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Page 31: Charging Motor
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Page 32: Motor Operator Unit
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Page 33: Table
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Page 34: Spring Discharge Interlock
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Page 35: Mechanism Part Replacement
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Page 36
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Page 37: Ratchet Pawl Replacement
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Page 38: Drawout Mechanism
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Page 39: Section 7-Accessories
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Page 40: Aks/Akst 50
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Page 41: Secondary Disconnects
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Page 42: Auxiliary Switch
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Page 43: Adjustments
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Page 44: Undervoltage Device
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Page 45: Static Time-Delay Undervoltage
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Page 46: Electric Lockout Device
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Page 47: Bell Alarm Device
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Page 48: Open Fuse Lockout Device
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Page 49: Section 8-Type Sst Overcurrent
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Page 50: Current Sensors
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Page 51
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Page 52: Replacement Of Current Sensors -Aks 50
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Page 53: Replacement Of Current Sensors - Aka 75/100
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Page 54
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Page 55
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Page 56: Troubleshooting
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Page 57: Resistance Values
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Page 58
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Page 59
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Page 60: Section 9-Type Ecs Overcurrent Trip Device
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Page 61: Ecs Cabling Diagram
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Page 62: Trip Device
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Page 63
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Page 64: Microversatrip Installation
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Page 65: Akr 50/100 Installation
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Page 66: Current Sensors
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Page 67: Akr 751100
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Page 68: Aks50
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Page 69: False Tripping-Breakers
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Page 70
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Page 71
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Page 72
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Page 73: Section 11-Rms-9/Epic Microversatrip
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Page 74: Current Sensors
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Page 75
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Page 76
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Page 77: Table 19
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Page 78: False Tripping-Breakers Equipped With Ground Fault
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Page 79
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Page 80
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Page 81: Section 12-Microversatrip
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Page 82: Read This First
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Page 83: Trip Unit Removal And Replacement
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Page 84: Phase Current Sensors
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Page 85: Neutral Current Sensors
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Page 86: Trouble-Shooting Guide
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Page 87: Section 13-Type Ec Overcurrent Trip Device
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Page 88
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Page 89: Direct Acting Tripping Device Ec-1 B
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Page 90: Adjustments
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Page 91: Series Overcurrent Tripping Device Ec-2A
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Page 92
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Page 93: Serles Overcurrent Tripping Device Ec-1
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Page 94: Instantaneous Tripping
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Page 95: Reverse Current Tripping Device
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Page 96: Adjustments
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Page 97: Section 14-Electrical Characteristics
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Page 98: Shunt Trip And Undervoltage Device
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Page 99: Instantaneous Undervoltage Device Settings
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Page 100
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Page 101
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Page 102
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This manual is also suitable for:
Akr-100
Aks-50
Akr-60-75
Akr-90-100
Aks-5a-50
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