NHP TemBreak PRO P - Troubleshooting

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TemBreak PRO P_BE-UM-001-EN V1.3.0
Troubleshooting
In the event of a problem when using the TemBreak PRO system, this section provides advice on how to resolve issues.
Problem description
Possible cause
Remedial advice
1
Ready LED OFF
Insufficient or no power to the
OCR
Verify power supply requirements. Refer to OCR Power Supply section.
MCCB must be closed and load drawing sufficient current through main poles.
Verify the current through the MCCB poles meets the minimum requirements.
Incorrect or faulty wiring
Verify integrity of wiring and connections.
Verify and correct any:
- Loose connections to line and load terminals
- Incorrect terminals / conductors / connector pins
2
Ready LED flashing orange
Incorrect settings
Verify adjustment dials are in correct defined positions
OCR is faulty
Replace MCCB
3
OCR over temperature alarm
(Internal OCR temperature > 105°C)
Excessive ambient temperature.
Verify ambient temperature surrounding the MCCB do not exceed the maximum rated
ambient temperature range (-25°C...+70°C)
Loose terminal screw or conductor
connecting screw.
Verify and correct any loose connections to load and line terminals.
Refer to torque and connection requirements in TemBreak PRO P_BE Installation
Instructions supplied with MCCB
Increased contact resistance,
loose internal connection or
contact failure.
Replace MCCB
High proportion of high frequency
distortion in load current.
Decrease distortion content of load circuit
4
Abnormal voltage on load side
Excessive wear of contacts
Replace MCCB.
Foreign matter interfering with
contacts or contact surfaces
5
Failure in ON position
Reset operation not conducted
after tripping operation.
Perform reset operation.
6
Failure in RESET position
UVT not energised
Apply voltage to UVT
Circuit breaker service life ended
due to large number of switching
cycles using SHT or UVT
Replace MCCB
Fault of tripping mechanism
7
Nuisance tripping while rated current
not reached
Vibration and/or shock
Dampen vibration of MCCB and review installation requirements
High proportion of high frequency
distortion in load current.
Decrease distortion content of load circuit
Electromagnetic induced
interference (from nearby
conductors or external radio
sources)
Review nearby sources of conducted and radiated emissions (e.g. radio sources,
high-speed switching devices including variable frequency drives)
Excessive surge
Isolate and mitigate surge source (e.g. surge protection devices)
Erroneous connection of control
circuit for SHT or UVT
Verify control wiring and supply to SHT and UVT