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H9 ASD Installation and Operation Manual 249
*OP Overvoltage
DC bus voltage exceeds
specifications.
• ASD attempting to start into a spinning motor after a
momentary power loss.
• Incoming commercial power is above the specified
range.
• Decel time is too short.
• Voltage spikes at the 3-phase input; install inductive
filter.
• DBR required.
• DBR resistance value is too high.
• DBR function is turned off.
• Overvoltage Stall feature is turned off.
• System is regenerating.
• Load instability.
• Disable the Ridethrough function (F302).
OT Overtorque Torque requirement is in excess
of the setting of
F616 or F617
for a time longer than the setting
of
F618.
• ASD is not correctly matched to the application.
• F616 or F617 setting is too low.
• Obstructed load.
*POFF Control
Undervoltage
Undervoltage condition at the 5,
15, or the 24 VDC supply.
• Defective Control board.
• Excessive load on power supply.
• Low input voltage.
PtSt Reference Point Two speed-reference frequency
setpoint values are too close to
each other.
• Two speed reference frequency setpoints are too close to
each other (increase the difference).
UC Undercurrent With the Low-current Trip
(
F610) parameter enabled, the
output current of the ASD is
below the level defined at
F611
and remains there for a time
longer than the setting of
F612.
this function sets the low-current trip threshold
* Reset ignored if active.
LED
Display
LCD
Display
Description Possible Causes