4. SETPOINT PROGRAMMING S3 DIGITAL INPUTS
4-15
Page 3 of setpoints has been designated the 'DIGITAL INPUTS’ page. The SR469 has nine digital inputs.
Five of the SR469 digital inputs have been pre-assigned as switches having a specific function. Four of the five pre-assigned digital
inputs are always functional and do not have any setpoint messages associated with them. The fifth, the Starter Status, may be config-
ured for either an 'a' or 'b' auxiliary contact. The remaining four digital inputs are assignable; that is to say, the function that the input is
used for may be chosen from one of a number of different functions. Some of those functions are very specific, others may be pro-
grammed to adapt to the user requirements.
If the Two-Speed Motor feature is enabled, ASSIGNABLE INPUT4 will be dedicated as the
Two-Speed Motor Monitor.
4.4.1
ACCESS SWITCH
Terminals C1 and C2
must
be shorted to allow changing of any setpoint values. This safeguard is in addition to the setpoint passcode
feature, which functions independently (S1 SR469 SETUP /PASSCODE).
4.4.2
TEST SWITCH
Once the SR469 is in service, it may be tested from time to time as part of a regular maintenance schedule. The relay will have accu-
mulated statistical information relating historically to starter and motor operation. This information includes: last trip data, demand data (if
the metering features are in use), MWh and Mvarh metering, RTD maximums, the event record, analog input minimums and maximums,
number of motor trips, number of trips by type, total motor running hours, learned parameters, number of starter operations, number of
motor starts, number of emergency restarts, and the digital counter. When the relay is under test, Shorting the SR469 Test input (C3 and
C4) will prevent all of this data from being corrupted or updated. The SR469 in Service LED (indicator) will flash while the SR469 Test
terminals are shorted.
4.4.3
EMERGENCY RESTART
Shorting terminals D17 and D23 will discharge the thermal capacity used to zero, zero any Starts/Hour Block lockout, zero any Time
Between Starts Block lockout, and reset all Trips and Alarms so that a hot motor may be restarted. However, a Restart Block lockout will
remain active (it may be used as a backspin timer) and any trip condition that is still present such as a hot RTD will still cause a trip.
Therefore, while the terminals are shorted, the Trip and Block output relays will remain in their normal non-operated state. In the event of
a real emergency, the Emergency Restart terminals should remain shorted until the emergency is over. Also, while the Emergency Re-
start terminals are shorted, a Service Alarm message will indicate any trips or blocks that are active. As the name implies, this feature
should only be used in an emergency as it defeats the purpose of the Relay, PROTECTING THE MOTOR.
Any Emergency Restart
input transition from open to closed or closed to open will be logged as an event.
4.4.4
REMOTE RESET
Shorting terminals D18 and D23 will reset any trips or latched alarms provided that the condition that caused the alarm or trip is no
longer present.
If there is a lockout time the Block Start relay will not reset until the lockout time has expired.
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