Toshiba H7 Operation Manuals page 192

EOI
Function
Display
OH Overheat
OL 1 ASD Overload
OL 2 Motor
Overloaded
DBR Overload
OLR
Trip
OP 1 Overvoltage
(Accel)
H7 ASD Operation Manual
Description
This fault is caused by the
an excessive ambient
temperature as detected by
the internal thermistor.
This fault occurs when the
maximum output of the
ASD is insufficient for the
load requirements.
This fault is caused by
having an excessive load
placed on the motor.
This trip is caused by an
excessive current at the
Dynamic Braking
Resistor.
This fault is caused by an
overvoltage condition
during acceleration.
Possible Causes
• Cooling fan inoperative.
• Cooling fan vent is closed
or obstructed.
• Ambient temperature is too
high (may be too close to
heat generating equipment).
• ASD is operating at an
elevated temperature.
• Internal thermistor is
disconnected.
• An excessive load.
• Too rapid of an
acceleration.
• DC damping rate is set too
high.
• The motor is starting into a
load after a momentary
power failure.
• The ASD is improperly
matched to the application.
• Carrier frequency is set too
high.
• V/f parameter improperly
set.
• Motor is locked.
• Continuous operation at low
speed.
• The load requirements are
in excess of what the motor
can deliver.
• Deceleration time is too
short.
• DBR configuration
improperly set.
• The ASD is attempting to
start a running motor after a
momentary power loss.
• The incoming utility power
level is above the specified
range.
Corrective Action
• Replace the cooling fan.
• Ensure that there is no
heat producing equipment
around the ASD.
• Ensure that the ASD is
adequately ventilated (see
Mounting the ASD on pg.
8).
• Allow the system to cool
and retry.
• Make a service call.
• Reduce the load.
• Lengthen the acceleration
time.
• Decrease the damping
rate.
• Ensure that the ASD is
properly matched to the
application.
• Lower the carrier
frequency.
• Ensure that the V/f
parameter is properly set.
• Ensure that the motor is
not locked.
• Ensure that the motor is
properly matched to the
application.
• Extend the deceleration
time.
• Increase the capacity of
the DBR and the setting at
F309.
• Ensure that the DBR is
appropriately sized for the
application.
• Set the Ridethrough mode
(F302) to Off.
• Ensure that the incoming
utility power is within
normal operating
parameters.
• Make a service call if the
failure persists.
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