Operating Instructions

Troubleshooting
Siemens Building Technologies, Inc. 91
Error Cause Diagnosis/Remedy
Drive
Reaction
F0002,
Overvoltage
• DC link voltage (r0026)
exceeds trip level.
• Overvoltage can be
caused either by the input
supply voltage being too
high or if motor is in
regenerative mode.
• Regenerative mode can
be caused by fast ramp
downs or if the motor is
driven from an active
load.
• Supply voltage must lie within the
limits indicated on the SED2
rating plate.
• Manually commission motor
identification per P1910.
• DC link voltage controller must be
enabled (P1240) and
parameterized correctly.
• Ramp-down time (P1121) must
match inertia of load.
• Loose wire on output.
• Set P1800=6 or 8 to reduce pulse
size.
• Review quick commissioning with
User Access Level P0003=3
(expert) and specify a value for
P0309, rated motor efficiency.
• On systems with multiple motors,
one may be pushing the other.
• System electrical disturbance
may need correction.
• If the SED2 faults on F0002
(overvoltage) on a start
command, flying start may have
to be optimized. This is typically
done by reducing the values in
P1203 and P1202.
NOTE: Higher inertia requires long
ramp-down times.
Off2
F0003,
Undervoltage
• Input power supply failed.
• Shock load outside the
specified limits.
• Supply voltage must lie within the
limits indicated on the SED2
rating plate.
• Supply voltage must not be
susceptible to temporary failures
or voltage reductions outside
tolerance.
• Use Ramp-up Time P1120 to
increment the ramp-up time.
Off2