Table of Contents
Advertisement
4.4 S3 DIGITAL INPUTS
4 SETPOINT PROGRAMMING
4.4 S3 DIGITAL INPUTS
4.4.1 DESCRIPTION
Setpoints page 3 has been designated the DIGITAL INPUTS page. The 469 has nine digital inputs.
Five of the 469 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, Starter Status, may be configured 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 programmed to adapt
to the user requirements. If the Two-Speed Motor feature is enabled, ASSIGNABLE INPUT 4 will be dedicated
as the Two-Speed Motor Monitor.
4.4.2 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 (see Section 4.2.1: PASSCODE on page 4–4).
4.4.3 TEST SWITCH
4
Once the 469 is in service, it may be tested from time to time as part of a regular maintenance schedule. The
relay will have accumulated statistical information relating historically to starter and motor operation. This infor-
mation 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. Shorting the 469 Test input (terminals C3 and
C4) prevents all of this data from being corrupted or updated when the relay is under test. The In Service LED
will flash while the test terminals are shorted.
4.4.4 EMERGENCY RESTART
Shorting terminals D17 and D23 discharges the thermal capacity used to zero, sets any Starts/Hour Block
lockout to zero, sets any Time Between Starts Block lockout to zero, 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 remains (such as a hot RTD) will still cause a trip. Therefore, while the termi-
nals 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 Restart terminals are shorted, a Service Alarm message indicates any trips or blocks that
are active. As the name implies, this feature should only be used in an emergency – using it otherwise defeats
the purpose of the relay, namely, protecting the motor. Any Emergency Restart input transition from open to
closed or closed to open is logged as an event.
4.4.5 REMOTE RESET
Shorting terminals D18 and D23 resets 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.
4-16
469 Motor Management Relay
GE Power Management
Advertisement
Table of Contents
