Rockwell Automation Publication 7000-TG002J-EN-P - March 2015 41
Fault Messages Chapter 1
X STO Req Fault 618 STO Request Fault: The demand for the Safe Torque Off (STO)
function was not consistent across all channels. There is a
mismatch among four channels.
• Verify the STO wiring and relevant components.
• Cycle the control power before attempting to reactivate the STO feature.
• If the same fault trips the drive again, contact the manufacturer for further actions.
X Sync Field Loss Synchronous motor application.
The drive has commanded full field current 1.0 pu for 30
seconds. This is not a typical operating point for the drive.
• The drive has detected the motor field current has been interrupted.
• For 3 phase AC brushless motors, confirm the phasing to the exciter card is correct. Exciters
require ABC rotation to their electronic circuit boards.
• Exciter circuits typically have an Enable permissive. Locate this input on the exciter control
board and confirm it is enabled.
• Exciter circuits have built in temperature switches to protect the SCRs, confirm this switch
is not in the tripped position.
X Sync VSB 460 This fault indicates that the voltage sensing board associated
with the synchronous transfer voltages is not plugged in.
• Check connector J25 at ACB.
• Verify the ribbon cable connection from Sync VSB to ACB board.
X Sync Xfer Failure 162 A synchronous transfer was not completed in the time
specified in Sync Xfer Time (P230) and the drive has faulted.
This fault will only occur if the parameter Drive Fault4 (P370),
bit 2, SyncXferFail is enabled (=1). If bit 2, SyncXferFail is not
set (=0), the drive will go back to last speed command and
issue a warning.
• Instability at synchronous speed. Check for stability of the synchronous transfer process/
speed regulator.
• Motor cannot reach synchronous speed due to heavy load.
• Check load conditions for torque limit or low alpha line (low hline voltage).
• Consult factory for review of synchronous transfer parameters.
• This fault indicates that the drive failed to synchronize the motor to the bypass within the
specified time. Adjust the Sync Reg Gain (P225), Sync Error Max (P228), Spd Reg
Bandwidth (P81) for a smooth transfer.
X X X TempFeedback Loss
(C-Frame only)
73 This fault occurs only if the drive is not running. The drive has
detected missing temperature feedback from the cooling
system. A missing sensor can be interpreted as either 0 °C
(32 °F) or over 100 °C (212 °F), and both are unrealistic values,
so it is considered a feedback loss.
• Verify sensor is completely seated properly on TFB.
• Measure sensor resistance.
• Verify fiber-optic cables are properly seated on TFB.
• Verify the TFB has power.
• Replace if necessary.
X fiber-optic 506 The drive has lost the fiber-optic signal from the specified
temperature feedback board.
• Check for damaged fiber-optic cable or loose connection.
X TFB 2U Fbk Error 496 The drive has lost the fiber-optic signal from the specified
temperature feedback board.
• Check for damaged fiber-optic cable or loose connection.
X TFB 2V Fbk Error 497
X TFB 2W Fbk Error 498
X UPS Fault 62 The drive has detected that either the UPS is running on low
battery or there is an internal problem with the UPS and the
dc output voltage of the DC/DC converter fed by the UPS has
dropped below 52V.
• Check the UPS and the AC/DC power supply.
• Investigate what is causing PS dip. Replace UPS or PS if the problem still persists.
X UV Blcked Exhst 478 High air pressure reading coming back from analog air
pressure transducer located between the converter sections.
• Ensure pressure sensor is working, there are no obstructions to the path of the exhaust
airway or through the heatsinks.
• Check the cooling fans for abnormal operation.
• Verify if the trip setting (P925) matched factory recommended value.
All Drive Types
PF7000A
PF7000B
PF7000C
Marine Drive
Heat pipe Drive
Fault Message Fault Code Description Recommended Action(s)
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