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Siemens Building Technologies
SED2 variable speed drives
CM1U5192en
HVAC Products
Troubleshooting
01.2002
7.2.2
Warning code lists
Error
Cause
Diagnosis & Remedy
Reaction
A0501
Current limit
Ø
Motor power > VSD power.
Ø
Motor cables are too long.
Ø
Earth faults.
Check the following:
1. Motor power (P0307)
≤
VSD power (P0206).
2. Cable length limits must not be exceeded.
3. Motor cable and motor must not have short
circuits or earth faults.
4. Motor parameters must match the motor in use.
5. Value of stator resistance (P0350) must be
correct.
6. The motor must not be obstructed or
overloaded.
Increase ramp-up time.
Reduce boost level
.
--
A0502
Overvoltage limit
Ø
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.
--
A0503
Undervoltage
limit
Ø
Main power supply failed.
The main power supply (P0210) and consequently
the DC link voltage (R0026) are below the defined
threshold value (P2172).
Check the main supply voltage (P0210).
--
A0504
VSD
overtemperature
Ø
The warning level of the VSD heatsink
temperature (r0037) is exceeded.
This results in a reduced pulse frequency and/or a
reduced output frequency (dependent on
parameterization in (P0610).
Check the following:
1. The ambient temperature must lie within the
limits specified.
2. The load conditions and duty cycle must lie
within the specified conditions.
3.
The fan must turn when the VSD is running.
--
A0505
VSD I
2
T
Ø
Warning level exceeded. The current supply is
reduced if parameterized (P0610 = 1).
Check that the duty cycle lies within the limits
specified.
Motor power (P0307)
>
VSD power (P0206).
--
A0506
VSD duty cycle
Ø
Difference between the heatsink temperature
and the IGBT exceeds the warning levels.
Check the following: Make sure that the load duty
cycles (temporary overload) lie within the limits
specified.
--
A0511
Motor over-
temperature I
2
T
Ø
The motor is overloaded.
Ø
The duty cycle is outside the tolerance.
--
A0520
Rectifier
overtemperature
Ø
The warning level of the rectifier heatsink
temperature is exceeded.
Check the following:
1. The ambient temperature must lie within the
limits specified.
2. The load conditions and duty cycle must lie
within the specified conditions.
3.
The fan must turn when the VSD is running.
--
A0523
VSD output fault
Ø
The On-phase is interrupted at the VSD output.
--
A0541
Motor data
identification
enabled
Ø
Motor data identification (P1910) selected or
running.
--
A0600
RTOS data loss
--
A0910
Vdc (max.)
controller
disabled
Ø
Vdc max controller disabled as not able to
keep the DC link voltage (r0026) within
threshold limits (P2172).
Ø
Permanent supply overvoltage.
Ø
Occurs if the motor is driven by a load forcing
the motor to go into energy recovery operation.
Ø
Occurs during ramp-down of very high duty
cycles.
Check the following:
1. Input voltage must lie within specified range.
2. The load must be adjusted.
3.
In some cases, brake resistance must be
applied.
--
A0911
Vdc (max.)
controller
enabled
Ø
Vdc max controller is enabled.
The ramp-down times are increased automatically
to keep the DC link voltage (r0026) within the
limits specified (P2172).
--
