GE AF-650 GP Operating Instructions Manual page 57

WARNING 23, Internal fan fault
The fan warning function is an extra protective function that checks if the fan
is running/mounted. The fan warning can be disabled in par. SP-53 Fan Mon-
itor ([0] Disabled).
For the unit size 4x, 5x, and 6x frequency converters, the regulated voltage
to the fans is monitored.
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
4
WARNING 24, External fan fault
The fan warning function is an extra protective function that checks if the fan
is running/mounted. The fan warning can be disabled in par. SP-53 Fan Mon-
itor ([0] Disabled).
For the unit size 4x, 5x, and 6x frequency converters, the regulated voltage
to the fans is monitored.
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
WARNING 25, Brake resistor short-circuited:
The brake resistor is monitored during operation. If it short-circuits, the brake
function is disconnected and the warning appears. The frequency converter
still works, but without the brake function. Turn off the frequency converter
and replace the brake resistor (see par. B-15 Brake Check.
ALARM/WARNING 26, Brake resistor power limit:
The power transmitted to the brake resistor is calculated as a percentage, as
a mean value over the last 120 s, on the basis of the resistance value of the
brake resistor (par. B-11 Brake Resistor (ohm)) and the intermediate circuit
voltage. The warning is active when the dissipated braking power is higher
than 90%. If Trip [2] has been selected in par. B-13 Braking Thermal Over-
load, the frequency converter cuts out and issues this alarm, when the dissi-
pated braking power is higher than 100%.
ALARM/WARNING 27, Brake chopper fault:
The brake transistor is monitored during operation and if it short-circuits, the
brake function disconnects and the warning comes up. The frequency con-
verter is still able to run, but since the brake transistor has short-circuited,
substantial power is transmitted to the brake resistor, even if it is inactive.
Turn off the frequency converter and remove the brake resistor.
This alarm/warning could also occur should the brake resistor overheat. Ter-
minal 104 to 106 are available as brake resistor. Klixon inputs, see section
Brake Resistor Temperature Switch.
Troubleshooting:
Warning: There is a risk of substantial power being trans-
mitted to the brake resistor if the brake transistor is short-
circuited.
ALARM/WARNING 28, Brake check failed:
Brake resistor fault: the brake resistor is not connected/working.
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High Power Service Manual for Unit Sizes 6x
ALARM 29, Heatsink temp:
The maximum temperature of the heatsink has been exceeded. The temper-
ature fault will not be reset until the temperature falls below a defined heat-
sink temperature. The trip and reset point are different based on the fre-
quency converter power size.
Troubleshooting:
Ambient temperature too high.
Motor cable too long.
Incorrect clearance above and below the frequency converter.
Dirty heatsink.
Blocked air flow around the frequency converter.
Damaged heatsink fan.
For the unit size 4x, 5x, and 6x frequency converters, this alarm is based on
the temperature measured by the heatsink sensor mounted inside the IGBT
modules. For the unit size 6x frequency converters, this alarm can also be
caused by the thermal sensor in the rectifier module.
Check fan resistance.
Check soft charge fuses.
IGBT thermal sensor.
ALARM 30, Motor phase U missing:
Motor phase U between the frequency converter and the the motor is missing.
Turn off the frequency converter and check motor phase U.
ALARM 31, Motor phase V missing:
Motor phase V between the frequency converter and the motor is missing.
Turn off the frequency converter and check motor phase V.
ALARM 32, Motor phase W missing:
Motor phase W between the frequency converter and the motor is missing.
Turn off the frequency converter and check motor phase W.
ALARM 33, Inrush fault:
Too many power-ups have occurred within a short time period. Let the unit
cool to operating temperature.
See the chapter Specifications for the allowed number of power-ups within
one minute.
WARNING/ALARM 34, Network communication fault:
The network on the communication option card is not working.
WARNING 35, Out of frequency range:
This warning is active if the output frequency has reached par. H-72 Warning
Speed Low or par. H-73 Warning Speed High. If the frequency converter is set
to closed loop [3] in par. H-40 Configuration Mode, the warning is active in the
display. If the frequency converter is not in this mode bit 008000 Out of fre-
quency range in extended status word is active but there is no warning in the
display.
WARNING/ALARM 36, Mains failure
This warning/alarm is only active if the supply voltage to the frequency con-
verter is lost and par. SP-10 Line failure is NOT set to OFF. Check the fuses to
the frequency converter
ALARM 37, Phase imbalance:
There is a current imbalance between the units.