Toshiba H7 - Page 192

H7 ASD Operation Manual 185
OH Overheat This fault is caused by the
an excessive ambient
temperature as detected by
the internal thermistor.
• 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.
• 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.
OL 1 ASD Overload This fault occurs when the
maximum output of the
ASD is insufficient for the
load requirements.
• 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.
• 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.
OL 2 Motor
Overloaded
This fault is caused by
having an excessive load
placed on the motor.
• 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.
• 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.
OLR DBR Overload
Trip
This trip is caused by an
excessive current at the
Dynamic Braking
Resistor.
• Deceleration time is too
short.
• DBR configuration
improperly set.
• 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.
OP 1 Overvoltage
(Accel)
This fault is caused by an
overvoltage condition
during acceleration.
• The ASD is attempting to
start a running motor after a
momentary power loss.
• The incoming utility power
level is above the specified
range.
• 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.
EOI
Display
Function Description Possible Causes Corrective Action
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