Operating Instructions

SED2 VFD Startup, Operation, and Maintenance Manual
98 Siemens Building Technologies, Inc.
Warning Messages
Error Cause Diagnosis and Remedy
Drive
Reaction
A0501, Current
limit
• Motor power>SED2 power.
• Motor cables are too long.
• Ground faults.
• Check belt tension.
• Motor power (P0307)
>SED2 power (P0206).
• Cable length limits must
not be exceeded.
• Motor cable and motor
must not have short
circuits or ground 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.
• Check belt tension, if
applicable.
• Increase ramp-up time.
• Reduce boost level.
—
A0502,
Overvoltage
limit
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
SED2 input voltage or
extend the ramp-down time
for the SED2.
—
A0503,
Undervoltage
limit
Input power failed.
The input power and
consequently the DC link
voltage (r0026) are below the
defined threshold value.
Check input supply voltage. —
A0504, SED2
over-
temperature
The warning level of the SED2
heat sink temperature (r0037) is
exceeded.
This results in a reduced pulse
frequency and/or a reduced
output frequency (dependent
on parameter setting in
(P0610).
• The ambient temperature
must lie within the limits
specified.
• The load conditions and
duty cycle must lie within
the specified conditions.
• The fan must turn when
the SED2 is running.
—