146 MOTOR DRIVE ALARMS
8.1.11.12 DRIVE TRIP MESSAGE / Synchronization loss
The PL/X controller automatically " locks on" to any 3-phase supply within a frequency range of 45 to 65
Hertz. This allows the thyristors to be fired at the correct instant during each supply cycle. The
synchronisation circuit can cope with a large level of supply distortion to ensure operation with very distorted
supplies. The lock on time is 0.75 seconds. If the standard wiring configuration is adopted with EL1/2/3
permanently energised then the phase lock will only need to lock on during the first application of po wer.
This allows the main contactor to be operated very rapidly with minimal start up delay if required.
Wiring configurations that involve application of the auxiliary supply coincident with a start
requirement will have 0.75 second delay prior to main contactor energisation.
If the supply frequency exceeds the min/max limits, or if the controller is supplied from a po w er supply which
has excessive distortion this may cause synchronisation errors and the alarm to operate.
Note. This alarm will operate during running. If there is failure to achieve synchronisation at start, then the
alarm CONT A CTOR LOCK OUT is displayed. See 8.1.11.1 8 DRIVE TRIP MESSAGE / Contactor lock out.
Alarm delay time: 0.5 secs.
8.1.11.13 DRIVE TRIP MESS A GE / Heatsink overtemp
In the event of blo wer failure, or restriction of the cooling airflo w, the heatsink temperature may rise to an
unacceptable level. Under these conditions, the heatsink overtemp alarm will operate.
If this alarm operates on units fitted with a heatsink blower, it should be checked for obstruction and the
cooling air path checked for obstructions. Models fitted with twin top mounted fans are provided with fan
stall protection. Once the obstruction is removed the fan should resume normal operation. If the fan does not
run, the fan assembly must be replaced. For units with an AC driven rear mounted fan (PL/X 185/225/2 65)
check that the 110V A C fan supply is present on terminals B1, B2. For PL/X 275 - 980 check that the 2 40 V
A C fan supply is present on the terminals provided under the lower connection cover. For PL/X 275 -98 0 this
alarm will also operate if the supply voltage is not present asw ell as for over-temperature of the heatsink.
The unit enclosure must be supplied with sufficient cool dry clean air. See 14.1 Product rating table.
The unit must be allo wed to cool in order to re-start. Alarm delay time: 0.75 secs
8.1.11.14 DRIVE TRIP MESSAGE / Short circuit digital outputs
See 8.1.4 MO T OR DRIVE ALARMS / Digital OP short circuit trip enable PIN 174.
8.1.11.15 DRIVE TRIP MESS A GE / Bad reference exchange
See 8.1.6 MO TOR DRIVE ALARMS / Reference exchange trip enable PIN 176.
Note. There is a flag on hidden PIN 701 which warns of a bad reference exchange. This flag is reset by a
start or jog command.
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
SYNCHRONIZ A TION LOSS
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
HEA TSINK O VERTEMP
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
SHORT CIRCUIT DIG OP
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
BAD REFERENCE EX CH
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