140 MOTOR DRIVE ALARMS
8.1.5 MOT OR DRIVE ALARMS / Missing pulse trip enable PIN 175
The controller continuously monitors the armature current w aveform. If a fault develops within the controller
or the armature bridge, it is possible that one or more pulses may be missing from the normal 6-pulse
armature current waveform. Although the controller may appear to function normally, the motor will
experience excess heating due to the distorted current w aveform.
If at least one of the 6 current pulses is missing from the feedback waveform and the current demand is
above 10% then the system will start counting missing pulses. The alarm will trigger after a sequential series
of missing pulses lasting approximately 30 seconds.
The most usual causes of missing pulse failure is either an open circuit main fuse, or a gate lead plug not
properly re-connected after a stack maintenance procedure. Alarm delay time: approx 30 secs.
8.1.6 MOT OR DRIVE ALARMS / Reference exchange trip enable PIN 176
The drive can transmit and receive a speed reference or other parameter to or from another controller using
the serial port. During the receive cycle it checks that the data received is valid. If the data is invalid then it
raises an alarm. This is only applicable in the SLA VE mode of operation. See 10.3 RS232 PORT1 / PORT1
REF EX CHANGE The alarm flag is available on hidden PIN 701.
Alarm delay time: 1.5 secs.
8.1.7 MOT OR DRIVE ALARMS / Overspeed delay time PIN 177
See 8.1.11.7 DRIVE TRIP MESSA GE / Overspeed.
MO TOR DRIVE ALARMS 2
175)MISSING PULSE EN
175)MISSING PULSE EN
EN ABLED
PARA METER RANGE DEF AULT PIN
MISSING PULSE EN ENABLED OR DIS ABLED EN ABLED 175
Allo ws the missing pulse alarm
trip to be disabled.
MO TOR DRIVE ALARMS 2
176)REF EX CH TRIP EN
176)REF EX CH TRIP EN
DISABLED
PARA METER RANGE DEF AULT PIN
REF EX CH TRIP EN ENABLED OR DISABLED DISABLED 176
Enables the REFERENCE
EX CHANGE data link alarm trip.
MO TOR DRIVE ALARMS 2
177)O VERSPEED DELA Y
177)O VERSPEED DELAY
5.0 SECS
PARA METER RANGE DEFAULT PIN
O VERSPEED DELA Y 0.1 to 600.0 seconds 5.0 secs 177
Sets the the delay time before
the overspeed alarm is latched.
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