Operating Instructions

SED2 VFD Startup, Operation, and Maintenance Manual
100 Siemens Building Technologies, Inc.
Error Cause Diagnosis and Remedy
Drive
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.
• Input voltage must lie
within specified range.
• Load must be adjusted.
• In some cases, brake
resistance must be
applied.
—
A0911, Vdc
(max.)
controller
enabled
Vdc maximum controller is
enabled.
Ramp-down times are
increased automatically to keep
the DC link voltage (r0026)
within the limits specified.
Increase ramp-down time. —
A0912, Vdc
(min) controller
enabled
• Vdc minimum controller
enabled if the DC link voltage
(r0026) drops below the
minimum value.
• Motor kinetic energy is used
to buffer the DC link voltage
and thus slow the SED2.
• Temporary supply failures do
not automatically lead to
undervoltage shutdown.
— —
A0920, Analog
input
parameters not
set properly
• Analog input parameters
must not be set to identical
values, as illogical values will
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
analog input type.
— —