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Siemens Building Technologies Commissioning Guide CM1G5192en
HVAC Products 9 Error messages 26.02.2003
Error Cause Diagnosis and troubleshooting Re-
sponse
A0912
Vdc (min) con-
troller enabled
Ø
Vdc min controller enabled if the DC link volt-
age (r0026) drops below the min. value
(P2172)
Ø The motor's kinetic energy is used to buffer the
DC link voltage and thus slow the VSD
Ø Temporary supply failures do not automatically
lead to undervoltage shutdown
--
A0920
ADC parameters
not set properly
Ø
ADC parameters must not be set to identical
values, as illogical values would result
Ø Index 0: Parameter settings for output identi-
cal
Ø Index 1: Parameter settings for input identical
Ø Index 2: Parameter settings for input do not
correspond to ADC type
--
A0921
DAC parameters
not set properly
Ø
DAC parameters must not be set to identical
values, as illogical values would result
Ø Index 0: Parameter settings for output identical
Ø Index 1: Parameter settings for input identical
Ø Index 2: Parameter settings for output do not
correspond to DAC type
--
A0922
No load applied
to VSD
Ø No load is applied to the VSD
Some functions may not work as under normal
load conditions.
--
A0952
Belt failure de-
tected
Ø Load conditions at the motor indicate a belt
failure or mechanical fault
Check the following:
1. No breakage, seizure, or obstruction of drive
train
2. Correct operation of external speed sensor, if in
use
3. P0402 (pulse/min at rated speed), P2164 (hys-
teresis frequency deviation) and P2165 (delay
time for permissible deviation) must have correct
values:
P2155 (threshold frequency f1)
P2157 (threshold frequency f2)
P2159 (threshold frequency f3)
P2174 (upper torque threshold 1)
P2175 (lower torque threshold 1)
P2176 (delay T_Torque)
P2182 (upper torque threshold 2)
P2183 (lower torque threshold 2)
P2184 (upper torque threshold 3)
P2185 (lower torque threshold 3)
--
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