144 MOTOR DRIVE ALARMS
8.1.11.4 DRIVE TRIP MESS A GE / Field loss
See 8.1.3 MO T OR DRIVE ALARMS / Field loss trip enable PIN 173.
Alarm delay time: 2 secs.
8.1.11.5 DRIVE TRIP MESSA GE / User trip
There is a hidden PIN 712 that will cause a trip after going high.
Use a jumper to connect to flag source. See 13.2.4 JUMPER connections. Alarm delay time: 0.5 secs.
8.1.11.6 DRIVE TRIP MESSA GE / Thermistor on T30
It is good practice to protect DC motors against sustained thermal overloads by fitting temperature sensitive
resistors or switches in the field and interpole windings of the machine. Temperature sensitive resistors have
a low resistance (typically 200 Ohms) up to a reference temperature (125 deg C). Above this, their
resistance rises rapidly to greater than 2000 Ohms.
Temperature switches are usually normally closed, opening at about 105 deg C.
Motor overtemperature sensors should be connected in series bet w een terminals T30 and T36. If the motor
temperature rises such that the resistance of the sensor exceeds 1800 Ohms, the thermistor alarm will be
activated. If this happens, the motor must be allo wed to cool before the alarm can be reset.
Motors overheat due to many factors, but the most common cause is inadequate venti lation. Check for
blo wer failure, wrong rotation of the blower, blocked ventilation slots and clogged air filters. Other causes of
overheating relate to excessive armature current. The nominal armature current on the motor nameplate
should be checked against the current calibration for the PL/X.
There is no motor temperature alarm inhibit; terminals T30 and T36 must be linked if over-temperature
sensors are not used.
Note. There is a flag on hidden PIN 702 which warns of thermistor over-temp after the normal delay time.
This flag is reset by a start or jog command.
Alarm delay time: 15 secs.
8.1.11.7 DRIVE TRIP MESSA GE / Overspeed
If the speed feedback signal exceeds 110% of rated speed for longer than the alarm delay time, then the
overspeed alarm is activated. This alarm is likely to be caused by a badly adjusted speed loop or overhauling
of motors controlled by 2 Quadrant models.
Alarm delay time: 0.5 secs. + (8.1.7 MOT OR DRIVE ALARMS / Overspeed delay time PIN 177).
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
FIELD LOSS
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
THERMIST OR ON T 30
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
O VERSPEED
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
USER TRIP
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