GE AF-650 GP Design And Installation Manual page 107

Warnings and Alarms
WARNING/ALARM 17, Control word timeout
There is no communication with the frequency converter.
The warning is only active when parameter O-04 Control
Word Timeout Function is not set to [0] Off.
If parameter O-04 Control Word Timeout Function is set to
[2] Stop and [26] Trip, a warning appears and the frequency
converter ramps down until it trips and then shows an
alarm.
Troubleshooting
•
Check the connections on the serial communi-
cation cable.
•
Increase parameter O-03 Control Word Timeout
Time.
•
Check the operation of the communication
equipment.
•
Verify a proper installation based on EMC
requirements.
WARNING/ALARM 20, Temp. input error
The temperature sensor is not connected.
WARNING/ALARM 21, Parameter error
The parameter is out of range. The parameter number is
reported in the keypad.
Troubleshooting
•
Set the affected parameter to a valid value.
WARNING/ALARM 22, Hoist mechanical brake
The value of this warning/alarm shows the type of
warning/alarm.
0 10
0 = The torque reference was not reached before timeout
(parameter B-27 Torque Ramp Time).
1 = Expected brake feedback not received before timeout
(parameter B-23 Activate Brake Delay, parameter B-25 Brake
Release Time).
WARNING 23, Internal fan fault
The fan warning function is a protective function that
checks if the fan is running/mounted. The fan warning can
be disabled in parameter SP-53 Fan Monitor ([0] Disabled).
For frequency converters with DC fans, there is a feedback
sensor mounted in the fan. If the fan is commanded to run
and there is no feedback from the sensor, this alarm
appears. For frequency converters with AC fans, the
voltage to the fan is monitored.
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
•
Check the sensors on the control card.
WARNING 24, External fan fault
The fan warning function is a protective function that
checks if the fan is running/mounted. The fan warning can
be disabled in parameter SP-53 Fan Monitor ([0] Disabled).
104
For frequency converters with DC fans, there is a feedback
sensor mounted in the fan. If the fan is commanded to run
and there is no feedback from the sensor, this alarm
appears. For frequency converters with AC fans, the
voltage to the fan is monitored.
Troubleshooting
•
Check for proper fan operation.
•
Cycle power to the frequency converter and
check that the fan operates briefly at start-up.
•
Check the sensors on the heat sink.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation. If a short
circuit occurs, the brake function is disabled and the
warning appears. The frequency converter is still
operational, but without the brake function.
Troubleshooting
•
Remove the power to the frequency converter
and replace the brake resistor (refer to
parameter B-15 Brake Check).
WARNING/ALARM 26, Brake resistor power limit
The power transmitted to the brake resistor is calculated as
a mean value over the last 120 s of run time. The
calculation is based on the DC-link voltage and the brake
resistor value set in parameter B-16 AC brake Max. Current.
The warning is active when the dissipated braking is >90%
of the brake resistor power. If [2] Trip is selected in
parameter B-13 Braking Thermal Overload, the frequency
converter trips when the dissipated braking power reaches
100%.
WARNING
If the brake transistor is short-circuited, there is a risk of
substantial power being transmitted to the brake
resistor.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during operation, and if a
short circuit occurs, the brake function is disabled, and a
warning is issued. The frequency converter is still
operational, but since the brake transistor has short-
circuited, substantial power is transmitted to the brake
resistor, even if it is inactive.
Troubleshooting
•
Remove power to the frequency converter and
remove the brake resistor.
High-power drives: This alarm/warning also occurs if the
brake resistor overheat. Terminals 104–106 of FK102 are
available as brake resistor temperature switch on the
power card of high-power drives. Unless used as an input,
a jumper must be placed between terminals 104 and 106
of FK102.
WARNING/ALARM 28, Brake check failed
The brake resistor is not connected or not working.
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