Bell & Gossett 176R0649C Technologic 502 Series Pump Controller - Manual (Page 55)

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WARNING 24, External fan fault
The fan warning function is an extra protec-
tive function that checks if the fan is running/
mounted.
The fan warning can be disabled in parameter
14-53 Fan Monitor ([0] Disabled).
Troubleshooting:
Check fan resistance.
Check soft charge fuses.
WARNING 25, Brake resistor short circuit
The brake resistor is monitored during operation.
If it short circuits, the brake function is discon-
nected and the warning appears. The controller
still works, but without the brake function. Turn
off the controller and replace the brake resistor.
WARNING/ALARM 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 seconds, on the basis of the
resistance value of the brake resistor, and the
intermediate circuit voltage. The warning is ac-
tive when the dissipated braking power is higher
than 90%. If Trip [2] has been selected in param-
eter 2-13 Brake Power Monitoring, the controller
cuts out and issues this alarm, when the dissi-
pated braking power is higher than 100%.
Warning: There is a risk of substantial power
being transmitted to the brake resistor if the
brake transistor is short-circuited.
WARNING/ALARM 27, Brake chopper fault
The brake transistor is monitored during opera-
tion and if it short-circuits, the brake function
disconnects and issues a warning. The controller
is still able to run, but since the brake transistor
has short-circuited, substantial power is trans-
mitted to the brake resistor, even if it is inactive.
Turn off the controller and remove the brake
resistor.
This alarm/warning could also occur should the
brake resistor overheat. Terminal 104 to 106 are
available as brake resistor.
WARNING/ALARM 28, Brake check failed
Brake resistor fault: the brake resistor is not con-
nected or not working.
Check parameter 2-15 Brake Check.
ALARM 29, Heatsink temp
The maximum temperature of the heatsink has
been exceeded. The temperature fault will not
be reset until the temperature falls below a
defined heatsink temperature. The trip and reset
point are different based on the controller power
size.
Troubleshooting:
Ambient temperature too high.
Motor cable too long.
Incorrect clearance above and below the con-
troller.
Dirty heatsink.
Blocked air flow around the controller.
Damaged heatsink fan.
Check fan resistance.
Check soft charge fuses.
IGBT thermal sensor.
ALARM 30, Motor phase U missing
Motor phase U between the controller and the
motor is missing.
Turn off the controller and check motor phase U.
ALARM 31, Motor phase V missing
Motor phase V between the controller and the
motor is missing.
Turn off the controller and check motor phase V.
ALARM 32, Motor phase W missing
Motor phase W between the controller and the
motor is missing.
Turn off the controller 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.
WARNING/ALARM 34, Fieldbus communication fault
The fieldbus on the communication option card
is not working.
WARNING/ALARM 35, Out of frequency range:
This warning is active if the output frequency has
reached the high limit (set in parameter 4-53)
or low limit (set in parameter 4-52). In Process
Control, Closed Loop, parameter 1-00 Configu-
ration Mode this warning is displayed.
WARNING/ALARM 36, Mains failure
This warning/alarm is only active if the supply
voltage to the controller is lost and parameter
14-10 Mains Failure is NOT set to OFF. Check
the fuses to the controller
ALARM 38, Internal fault
It may be necessary to contact your supplier.
Table 8-1. Warnings and Alarms (continued)