Toshiba H7 Operation Manuals page 194

EOI
Function
Display
RTRY Retry Indicator
Communication
T
Error
UC Low Current Trip
UP1 Undervoltage
Trip (Main
Circuit)
Undervoltage
UP2
Trip (Control
Circuit)
H7 ASD Operation Manual
Description
This display provides an
indication that the ASD is in
the Retry mode and that the
motor may restart without
warning. F303 may be setup
and enabled to allow for an
automatic motor restart after
a momentary power outage
or a momentary loss of the
ST-to-CC connection.
This fault is caused by an
inability of the ASD to
communicate with an
optional device or another
ASD in a master/follower
configuration.
This fault occurs when the
output current of the ASD
falls below the level defined
at F611 and remains there
for the time set at F612.
This fault is caused by a low
bus voltage.
This fault is caused by a low
bus voltage.
Possible Causes
Corrupted data at the master
ASD.
Broken or improper
connections associated with
the setup.
Improper setup information at
the option device.
Low-current threshold setting
in too high.
Low-current detection time is
too short.
Low input voltage.
Momentary power failure that
lasted longer than the time
setting of F628 so long as
F627 is enabled.
Low input voltage.
Momentary power failure that
lasted longer than the time
setting of F628 so long as
F627 is enabled.
Corrective Action
• Ensure that the master
ASD is programmed
properly.
• Ensure that the
connections are correct
and secured.
• Confirm all
communications settings.
• Make a service call if the
failure persists.
• Ensure that the Low-
current value is
appropriate for the
application (F611).
• Increase the Low-current
detection time (F612).
• Disable the Low-current
detection feature (F610).
• Make a service call if the
failure persists.
• Ensure that the input
voltage is within the
established parameters.
• Set the Ridethrough mode
to Ridethrough (F302).
• Enable F301 to allow for
a restart after a
momentary power failure.
• Increase the
Undervoltage Detection
time (F628).
• Ensure that the input
voltage is within the
established parameters.
• Set the Ridethrough
mode (F302) to
Ridethrough.
• Enable F301 to allow for
a restart after a
momentary power failure.
• Increase the
Undervoltage Detection
time (F628).
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