Toshiba H7 - Page 193

186 H7 ASD Operation Manual
OP 2 Overvoltage
(Decel)
This fault is caused by an
overvoltage condition
during deceleration.
• The decel time is too short.
• The DBR resistance value is
too high (F308).
• The DBR function is turned
off.
•The Overvoltage Stall
feature is turned off.
• The incoming utility power
level is above the specified
range.
• Extend the decel time
setting.
• Decrease the DBR value.
• Install a DBR and enable
the DBR feature.
• Enable the Overvoltage
Stall feature.
• Install an input
inductance onto the ASD
AC input to minimize
voltage spikes.
OP 3 Overvoltage
(Run)
The bus voltage exceeds
specifications while
running.
• The incoming utility power
level is above the specified
range.
• System is regenerating.
• Unstable load.
• Install a DBR.
• Install an input
inductance onto the ASD
AC input to minimize
voltage spikes.
• Balance the load.
OT Overtorque Trip This fault is caused by a
torque requirement by the
load in excess of the setting
of F616 or F617 for a time
longer than the setting of
F618.
ASD is too small for the
application.
F616 or F617 settings are too
low.
• Ensure that the ASD is
properly matched to the
application.
• Ensure that the F616 and
F617 settings are
appropriate for the
application.
• Ensure that the load is
unobstructed.
P-ER Frequency Point
Setting Error
Alarm
This alarm is provided to
notify the operator that two
speed reference frequency
setpoint settings are too
close to each other. This
condition may occur when
configuring the gain and
bias of the analog inputs of
the Control Terminal Strip
when operating in the
Speed or Torque Control
modes.
Frequency settings are too
close to each other.
• Increase the range
between the two
frequency settings.
POFF Control Circuit
Undervoltage
This fault is caused by an
undervoltage condition at
the 5, 15, or the 24 VDC
supply.
Defective control board.
Excessive load on the power
supply.
Low input voltage.
• Replace the control board.
• Ensure that the input
voltage is as specified.
• Make a service call if the
failure persists.
EOI
Display
Function Description Possible Causes Corrective Action
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