Troubleshooting - Mitsubishi Electric Freqrol Z024-UL Instruction Manual

15. TROUBLESHOOTING
Display
OC1:
Acceleration
overcurrent '1
OC2: Constant speed
overcurrent
' 1
If a fault occurs and the inverter does not work properly, determine the cause referring to the following
troubleshooting list and apply the remedy. If the cause cannot be identified in accordance with the list,
the inverter has a fault,
a
component is damaged, or if you have any inquiry, contact the nearest
service representative.
TROUBLESHOOTING
(1) Troubleshooting by the Parameter Unit Display.
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The Parameter Unit Display will indicate the following error codes and possible causes;
Posslblo cause Checkup Remedy
Is acceleration
t m
fast?
Is output short-circuited or
grounded?
Prolong acceleration time.
1 s load changed suddenly?
Eliminate sudden load
Overcurrent Is output short-circuited or change,
grounded?
THM: Overload alarm
THT: Overload alarm
I
Motor thermal relay
I
Inverter thermal relay
OC3: Deceleration
overcurrent
' 1
I
Lighten load. Change
motor/inverter capacity.
Is motor overloaded?
Is deceleration too fast?
Is output short-circuited or
grounded?
Prolong deceleration time.
OVT: Regenerative over-
voltage shutoff (decel- Overvoltage in DC output Is deceleration too Prolong deceleration time.
I
eration time set circuit
(It
should meet load GD' . )
I
improperly)
k
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