Technical data

SED2 Operation & Maintenance Manual
68 Siemens Building Technologies, Inc.
Error Cause Diagnosis and Remedy Reaction
A0910, Vdc
(max.) controller
disabled
• Vdc maximum controller
disabled as not able to
keep the DC link
voltage (r0026) within
threshold limits.
• Permanent supply
overvoltage.
• Occurs if the motor is
driven by a load forcing
the motor to go into
energy recovery
operation.
• Occurs during ramp-
down of very high duty
cycles.
Check the following:
• Input voltage must lie within
specified range.
• The load must be adjusted.
• In some cases, brake
resistance must be applied.
--
A0911, Vdc
(max.) controller
enabled
• Vdc maximum controller
is enabled.
The ramp-down times are
increased automatically to keep
the DC link voltage (r0026) within
the limits specified.
--
A0912, Vdc (min)
controller
enabled
Vdc minimum controller enabled
if the DC link voltage (r0026)
drops below the minimum value.
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.
--