MOT OR DRIVE ALARMS 143
8.1.10 MO T OR DRIVE ALARMS / External trip reset enable PIN 183
When DISABLED will prevent re-starting after a trip. ( DO NOT RELY ON THIS FOR SAFETY).
8.1.11 MO T OR DRIVE ALARMS / DRIVE TRIP MESS A GE
If an alarm is triggered, a displayed message sho wing w hich alarm caused the drive to shut down will
automatically appear in the bottom line of the display windo w, along with !!!!!! ALARM !!!!!! on the top line.
It can be removed from the display by tapping the left key or starting the drive. It may be re-examined using
the DRIVE TRIP MESSA GE window . The message will be memorised if the control supply is removed. To
remove the message from the memory, go to this window and tap the do wn key. Note. If when trying to
enter the DRIVE TRIP MESSA GE windo w no alarms have been detected, then the MOTOR DRIVE ALARMS
windo w will sho w the message N O ALARMS DETECTED and the DRIVE TRIP MESSA GE windo w is closed.
8.1.11.1 DRIVE TRIP MESS A GE / Armature overcurrent
An armature current trip is provided. This is set to operate for current feedback values exceeding 170% of
the maximum model current, or 300 % of 2)RA TED ARM AMPS, whichever is reached first.
Motor Faults: If the motor armature windings fail, the armature impedance may drop sharply. This may cause
excessive armature current which will activate the current trip. If this occurs, the motor armature should be
checked (Meggered) for insulation resistance, w hich should be above acceptable limits. (Disconnect the drive
when using a megger). If the motor becomes completely short-circuited, the current trip will not protect the
controller. High speed semi-c onductor thyristor fusing must always be provided to protect the thyristor stack.
Alarm delay time. Alarm will allo w 300 % loading for around 10 msecs and 400 % for 5 msecs.
8.1.11.2 DRIVE TRIP MESSA GE / Armature overvolts
If the motor armature voltage feedback exceeds 18)RATED ARM V OLTS by more than 20% then this alarm
will operate. . 18)RATED ARM V OLTS may be lower than the dataplate maximum. This alarm operates with
any source of speed feedback.
The alarm can be caused by a badly adjusted field voltage setting, field current loop, field-weakening back
emf loop or speed loop overshooting.
Alarm delay time: 1.5 secs.
8.1.11.3 DRIVE TRIP MESSA GE / Field overcurrent
The controller checks that the field current does not exceed 115 % of 4)RA TED FIELD AMPS.
This alarm could become active due to regulator failure or a badly tuned control loop causing overshoots.
Alarm delay time: 15 secs.
MO TOR DRIVE ALARMS 2
183)EX T TRIP RESET
183)EX T TRIP RESET
EN ABLED
PARA METER RANGE DEF AULT PIN
EX T TRIP RESET EN ABLED OR DIS ABLED ENABLED 183
Allo ws the trip to be reset by
ST ART on T33 going low.
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
ARM A TURE OVERCURRENT
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
ARMA TURE O VERV OLTS
MO TOR DRIVE ALARMS 2
DRIVE TRIP MESS A GE 3
DRIVE TRIP MESS A GE 3
FIELD O VERCURRENT
To Next Page
Loading...