GE 469 Instruction Manual page 132

469
Motor Management Relay
ASSIGNABLE
INPUT 1
5–26
TACHOMETER ALARM
MESSAGE
EVENTS: Off
TACHOMETER
MESSAGE
TRIP: Off
ASSIGN TRIP RELAYS:
MESSAGE
Trip
TACHOMETER TRIP
MESSAGE
SPEED: 10% Rated
TACHOMETER TRIP
MESSAGE
DELAY: 1 s
These setpoints apply only if the
Once the tachometer is chosen for a digital input, the setpoints shown here follow
the assignment message. The period of time between each switch closure is
measured and converted to an RPM value based on one closure per revolution.
A trip and alarm may be configured such that the motor or load must be at a certain
speed within a set period of time from the motor starting. The tachometer trip and
alarm features are configured such that the specified speed (
or
TACHOMETER ALARM SPEED
or
TRIP DELAY TACHOMETER ALARM DELAY
the time delay begins when the motor is started and resets when the desired speed
is reached. Once the motor is running and the speed drops below the set threshold,
the time delay restarts and the designated output contact will operate if the motor
fails to reach the set speed in the allotted time. This element is active when motor is
running and ignored while the motor is stopped. The RPM value may be viewed with
the
A2 METERING SPEED
For example, an inductive proximity probe or hall effect gear tooth sensor may be
used to sense the key on the motor. The probe could be powered from the +24 V
from the input switch power supply. The NPN transistor output could be taken to one
of the assignable switch inputs configured as a tachometer.
l) General Switch A to D
PATH: SETPOINTS S3 DIGITAL INPUTS
[ ] INPUT 1 FUNCTION:
General Sw. A
SWITCH NAME:
MESSAGE
General Sw. A
GENERAL SWITCH A:
MESSAGE
Normally Open
BLOCK INPUT
MESSAGE
FROM START: 0 s
GENERAL SWITCH A
MESSAGE
ALARM: Off
ASSIGN ALARM RELAYS:
MESSAGE
Alarm
GENERAL SWITCH A
MESSAGE
ALARM DELAY: 5.0 s
GENERAL SWITCH A
MESSAGE
EVENTS: Off
GENERAL SWITCH A
MESSAGE
TRIP: Off
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Range: On, Off
Range: Off, Latched, Unlatched
Range: Trip, Trip & Auxiliary2, Trip &
Range: 5 to 95% in steps of 1
Range: 1 to 250 s in steps of 1
is "Tachometer".
INPUT 1(4) FUNCTION
) must be reached in the specified time (
), otherwise the element operates. Initially,
actual value.
TACHOMETER
ASSIGNABLE INPUT 1(4
Range: See above
Range: 12 alphanumeric characters
Range: Normally Open,
Range: 0 to 5000 s in steps of 1
Range: Off, Latched, Unlatched
Range: Alarm, Alarm & Auxiliary2,
Range: 0.1 to 5000.0 s in steps of 0.1
Range: On, Off
Range: Off, Latched, Unlatched
S3 Digital Inputs
Aux2 & Aux3, Trip & Auxiliary3
TACHOMETER TRIP SPEED
TACHOMETER
)
Normally Closed.
Alarm & Aux2 & Aux3, Alarm &
Auxiliary3, Auxiliary2, Aux2 &
Aux3, Auxiliary3
GE Multilin