Bardac PLX - 8.1.1 MOTOR DRIVE ALARMS; Speed feedback mismatch trip enable PIN 171

MOT OR DRIVE ALARMS 137
If an alarm is enabled, triggered and
latched causing the drive to shut do wn,
then after approximately a further 10mS
no further alarms will be latched. Hence
when the latched status of the alarms is
monitored it is unlikely that more than 1
alarm will be latched. If ho wever more
than 1 is latched, then the first that
arrived and initiated the shutdown can
be determined from the DRIVE TRIP
MESSA GE menu.
8.1.1 MOT OR DRIVE ALARMS / Speed feedback mismatch trip enable PIN 171
Feedback type Fault mode Result if trip ENABLED Result if trip DISABLED
No faults normally possible. Alarm suppressed Alarm suppressed Armature Voltage
Armature voltage mode selected with field
weakening enabled.
Drive TRIP when field
weakening region entered.
Drive TRIP when field weakening
region entered.
Incorrect polarity and 172)SPEED TRIP T OL
set to less than approx. 20%
Drive TRIP Automatic switch to A V F
Incorrect polarity and 172)SPEED TRIP T OL
set to greater than approx. 2 0 %
Drive TRIP Drive TRIP
Tacho OR Encoder
Feedback loss and
172)SPEED TRIP T OL exceeded
Drive TRIP Automatic switch to A V F
Incorrect polarity Drive TRIP Drive TRIP
Total feedback loss ( < 10 % signal) Drive TRIP when field
weakening region entered.
Drive TRIP when field weakening
region entered.
Tacho OR Encoder
With field w eakening
Partial feedback loss Protection limited to armature
overvolts TRIP at minimum field
cur rent
Protection limited to armature
overvolts TRIP at minimum field
cur rent
Incorrect encoder and/or tacho polarity and
172)SPEED TRIP T OL set to less than approx.
20%
Drive TRIP Automatic switch to A V F
Incorrect encoder and/or tacho polarity and
172)SPEED TRIP T OL set to greater than
approx. 2 0 %
Drive TRIP Drive TRIP
Encoder loss and 1 72)SPEED TRIP TOL
exceeded.
Drive TRIP Automatic switch to A V F.
(The speed mismatch may be small
because the AVF component is still
valid, hence 1 72)SPEED TRIP T OL
must be set lo w enough to ensure
an automatic s witch occurs).
Encoder + Armature Volts
OR Encoder + Tacho.
combinational feedback
Tacho loss and
172)SPEED TRIP T OL exceeded
Drive TRIP Automatic switch to A V F
Incorrect encoder and/or tacho polarity Drive TRIP Drive TRIP
Total encoder and/or tacho loss ( < 1 0 %
signal)
Drive TRIP when field
weakening region entered.
Drive TRIP when field weakening
region entered.
Partial encoder and/or tacho loss Protection limited to armature
overvolts TRIP at minimum field
cur rent
Protection limited to armature
overvolts TRIP at minimum field
cur rent
Encoder + Armature Volts
OR Encoder + Tacho.
Combinational feedback
with field w eakening
Encoder + Armature voltage mode selected
with field w eakening enabled
Drive TRIP when field
weakening region entered.
Drive TRIP when field weakening
region entered.
Alarm sensing circuit
Alarm enable selector
Alarm
latching
circuit
A ctive trip monitor
PIN 181
Stored trip monitor
PIN 182
Speed feedback trip enable
PIN 171
Speed feedback mismatch tol
PIN 172
Field loss trip enable
PIN 173
Digital OP short cct trip enable
PIN 174
Missing pulse trip enable
PIN 175
Reference exchange trip enable
PIN 176
O verspeed delay time
PIN 177
Motor
Drive
Alarms
High for
Healthy
PIN 698
OR
Stall trip enable
PIN 178
Stall current level
PIN 179
Stall delay time
PIN 180
Ext trip reset
enable PIN 183
User Alarm.
Hidden PIN 7 12
MO TOR DRIVE ALARMS 2
171)SPD TRIP EN ABLE
171)SPD TRIP EN ABLE
ENABLED
PARA METER RANGE DEF AULT PIN
SPD TRIP EN ABLE EN ABLED OR DIS ABLED EN ABLED 171
Allo ws the speed feedback
mismatch TRIP to be disabled.
R R