ABB ACS800-67, Описание системы и руководство по запуску

Страница: 117 / 120

Tracing the source of warnings, limits and faults 117
Faults in measurements
Fault Cause What to do
Pulse encoder pulses or zero
pulse are missing or wrong Generator overcurrent
fault
Speed / position /
RTAC module fault If the encoder is of unisolated type, check that the
cable is grounded only on converter side.
In case of wrong encoder direction, check the
pulse encoder phasing (A/B channels).
Check the type and connection of the encoder;
differential encoder is recommended.
Current value is wrong.
Torque actual value does not
correspond to the reference
value.
There is reactive power without
reference.
Torque oscillates and
overcurrent fault occurs.
Current imbalance fault
Earth fault Faulty current
transformer inside
power module
Wrong values in
parameter group 99 in
the rotor-side converter
control program Check the current transformer.
Check the values in parameter group 99.