HP Anab EQ5 - Manual (Page 93)

EQ5 AC Drive Operations Manual
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TECO – Westinghouse Motor Company Alarm Codes & Causes 87
6. Alarm Codes, Causes and Troubleshooting
The drive’s built-in protective features protect the drive against operation outside its design limits.
6-1 Alarm Codes and Causes
Upon activation of an Alarm, the LED display shows the alarm code and the motor coasts to a stop.
A list of alarm codes and causes are shown in the following table.
Table 6-6-1 List of Alarms and Causes
Alarm Name
Keypad panel display
Contents of operation
LED LCD
Over current
OC1 OC DURING ACC
During
acceleration Alarm activates when one of following
conditions occur:
• Inverter output current momentarily
exceeds the specified over-current
detection level.
• Short-circuit or ground fault in the output
circuit occurs.
Note: Ground Fault for inverters 40HP/CT,
50HP/VT and above is covered by a
separate ground fault protection function
(EF).
OC2 OC DURING DEC
During
deceleration
OC3 OC AT SET SPD
Running at
constant
speed
Ground fault EF GROUND FAULT
Alarm activates when the following condition occurs:
• Ground fault in the in the inverter output circuit is
detected.
It is recommended to install a separate ground-fault / ground
leakage protection relay to protect against personal injury or
property damage.
Note: For drives 30HP/CT, 40HP/VT and below Ground
Fault Detection is covered by the over-current protection
function.
Overvoltage
OU1 OV DURING ACC
During
acceleration
Alarm activates when the following condition
occurs:
• The DC link circuit voltage of the main
circuit exceeds the overvoltage detection
level (230V series: 400V DC, 460V
series: 800V DC) due to an increase in
the regenerating current from the motor.
Note: No protection is provided for a high
voltage inadvertently applied to the inverter
that exceeds the maximum overvoltage level
(e.g. high voltage line.
OU2 OV DURING DEC
During
deceleration
OU3 OV AT SET SPD
Running at
constant
speed
Undervoltage LU UNDERVOLTAGE
Alarm activates when the following condition occurs:
• The DC link voltage of the main circuit falls below the
undervoltage detection level (230V series: 400V DC,
460V series: 800V DC) due to a low supply voltage.
Note: The undervoltage alarm is not displayed / activated
when parameter F14 (Restart after momentary power failure)
is selected or if the supply voltage falls below the level to
maintain control power.
Input open-
phase
Lin PHASE LOSS
Alarm activates when the following condition occurs:
• One of the input phases is lost (L1/R, L2/S, L3/T).
Note: Loss of an input phase may damage rectifying diodes
and / or bus capacitors.
Cont.