Operating Instructions

Chapter 7 – Troubleshooting
Siemens Building Technologies, Inc. 75
Reading Faults
• OK FAULT (r0052, bit 3) is a read-only fault status point (0=OK, 1=Fault).
• LAST FAULT (r0947(0)) shows the code for the most recent fault.
Resetting Faults
• Press to reset a fault condition.
• OK FAULT (r0052, bit 3) is a read-only fault status point (0=OK, 1=Fault). It can be acknowledged
with FAULT ACK (r0054, bit 7). Setting FAULT ACK (r0054, bit 7) resets the fault (1=Reset Fault).
NOTE: It is possible that motor performance may be affected at low frequencies if parameter P1310
falls under 50% (default value).
Warning Messages
Error Cause Diagnosis and Remedy Reaction
A0501, Current
limit
• Motor power > SED2
power.
• Motor cables are too
long.
• Ground faults.
Check the following:
• Motor power (P0307) SED2 power
(P0206).
• Cable length limits must not be
exceeded.
• Motor cable and motor must not
have short circuits or earth faults.
• Motor parameters must match the
motor in use.
• Value of stator resistance (P0350)
must be correct.
• The motor must not be obstructed or
overloaded.
• Increase ramp-up time.
• Reduce boost level.
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A0502,
Overvoltage limit
• The overvoltage limit is
reached.
This warning may appear on
ramp-down if the DC link is
disabled (P1240 = 0).
If this warning is displayed permanently,
check the drive input voltage or extend the
ramp-down time for the drive.
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