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Diagnostics Optimization CT MODBUS RTU Technical Data
466 E300 Design Guide
Issue Number: 1
OHt Rectifier
Rectifier over temperature
102
OHt Rectifier trip indicates that a rectifier over-temperature has been detected. The thermistor location can be identified
from the sub-trip number.
Recommend actions:
• Check enclosure / drive fans are still functioning correctly
• Check enclosure ventilation paths, door filters
• Check the motor and motor cable insulation with an insulation tester
• Force the heatsink cooling fans to run at maximum speed
• Increase ventilation
• Decrease acceleration / deceleration rates
• Reduce motor load
• Reduce duty cycle
• Install an output line reactor or sinusoidal filter
OI ac Instantaneous output over current detected
3
The OI ac trip indicates the instantaneous drive output current has exceeded VM_DRIVE_CURRENT_MAX.
Recommended actions:
• Check correct motor set-up
• Check correct motor connections
• Check for short circuit on the output cabling
• Check for control sequence of output motor contactors
• Check for control sequence of any output shorting contactor
• Check integrity of the motor insulation using an insulation tester
• Check correct operation of motor mechanical brake
• Check feedback device mechanical coupling
• Check feedback device wiring
• Check feedback signals are free from noise
• Has the phase angle autotune been completed (RFC-S)
• If seen during autotune reduce the voltage boost (Open loop, RFC-A)
• Reduce speed loop gains (I01, I02, I06 and I07 run and stop) – (Closed loop operation)
• Reduce current loop gains (I03, I04, I08 and I09 run and stop)
• Acceleration/deceleration rate is too short
OI Brake Braking IGBT over current detected: short circuit protection for the braking IGBT activated
4
OI Brake trip indicates an over current has been detected in the brake IGBT or the brake IGBT protection has activated.
Recommended actions:
• Check the brake resistor installation, wiring
• Check any external brake resistor protection
• Check brake resistor value is >
the minimum brake resistance value for the drive model
OI dc Power module over current detected from IGBT “ON” state voltage monitoring
109
OI dc trip indicates that the short circuit protection for the drive output stage has been activated.
Recommended actions:
• Disconnect the motor cable at the drive output and check both motor and motor cable with an insulation tester
• Replace the drive
Trip Diagnosis
Source xx y zz Description
Power system 01 Rectifier number zz Thermistor location defined by zz
Source xx y zz Description
Control
system
00
Rectifier
number
00
Instantaneous over-current trip when the measured a.c.
current exceeds VM_DRIVE_CURRENT[MAX].
Power
system
01 0
Source xx y zz Description
Power
system
01 0 00 Braking IGBT instantaneous over-current trip
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