250 ACE-tronics G9 ASD Installation and Operation Manual
Comm2 Error CM2 External communications
error.
• RS485 Failure.
• Improperly programmed ASD.
• Improper communications settings.
• Improperly connected cables.
*Control Under-Voltage POFF Under-voltage condition at
the 5, 15, or the 24 VDC
supply.
• Defective Control board.
•
Excessive load on power supply.
• Low input voltage.
Drooping drop Encoder pulses received in
excess of F998 setting of the
opposite direction of the
commanded frequency.
• Requirements of the load are in excess of the
c
apability of the motor.
• Falling load.
Emergency Lift LIFT Hoist-control function
switches from closed-loop
operation to open-loop
operation. Max speed UP =
F657. Max speed DOWN =
F656.
• Encoder feedback signal has been lost and
dis
crete input terminal #144 is activated or
F867 is set to Enabled.
External Fault EFLT Non-faulted ASD in a
m
ultiple ASD system.
• ASD of a multiple ASD system has faulted
— the non-faulted ASD(s) incur an External
Fault.
Forward Limit Switch FLS Forward Limit Switch
Ac
tivated.
• Crane has approached the end-of-travel for
the selected operating plane as indicated by
the limit switch.
Heavy Load HLD Output torque requirement
ha
s exceeded the setting of
F337.
• Load too heavy for motor.
• Resets when output torque requirement drops
below the setting of F337
Main Under-Voltage MOFF Under-voltage condition at
the 3-phase AC input to the
ASD.
• Low 3-phase utility voltage.
Maintenance Timer LTA Bearing Greaser Time has
e
xpired.
• Bearing Greaser Alarm Time setting has
expired (F621).
• Ambient Average Temperature Time setting
has expired (F634).
Motor Overload OLM Load requirement in excess of
t
he capability of the motor.
• V/f parameter improperly set.
• Motor is locked.
• Continuous operation at low speed.
• Load too heavy for motor.
* Reset ignored if active.
LCD Screen
LED
Screen
Description Possible Causes
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