Operating instructions

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Siemens Building Technologies SED2 variable speed drives CM1U5192en
HVAC Products Troubleshooting 01.2002
Error Cause Diagnosis & Remedy Reaction
A0912
Vdc (min)
controller
enabled
Vdc min controller enabled if the DC link
voltage (r0026) drops below the min. value
(P2172).
The motor's kinetic energy is used to buffer the
DC link voltage and thus slow the drive.
Temporary supply failures do not automatically
lead to undervoltage shutdown.
--
A0920
ADC parameters
not set properly
ADC parameters must not be set to identical
values, as illogical values would result.
Index 0: Parameter settings for output
identical.
Index 1: Parameter settings for input identical.
Index 2: Parameter settings for input do not
correspond to ADC type.
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A0921
DAC parameters
not set properly
DAC parameters must not be set to identical
values, as illogical values would result.
Index 0: Parameter settings for output identical.
Index 1: Parameter settings for input identical.
Index 2: Parameter settings for output do not
correspond to DAC type.
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A0922
No load applied
to VSD
No load is applied to the VSD.
Some functions may not work as under normal
load conditions.
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A0923
Both JOG left and
JOG right are
requested
Both JOG right and JOG left (P1055/P1056)
have been requested. This freezes the RFG
output frequency at its current value
.
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A0924
Belt failure
detected
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
(hysteresis 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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