S3 Digital Inputs; Description; Starter Status - GE 469 Instruction Manual

4 SETPOINTS

4.4S3 DIGITAL INPUTS

The 469 relay has nine (9) digital inputs. Five of the 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 associ-
ated 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.
a) 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 4–6).
b) TEST SWITCH
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 information includes: last trip
data, demand data (if the metering features are in use), MWh and Mvarh metering, RTD maximums, the event record, ana-
log 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.
c) 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 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 Restart terminals are shorted, a Service Alarm mes-
sage 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.
d) 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.
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PATH: SETPOINTS S3 DIGITAL INPUTS
n STARTER STATUS
n [ENTER] for more
This input is necessary for all motors. The 469 determines that a motor has stopped when the phase current falls below the
level that the relay can measure (5% of CT primary). Monitoring an auxiliary contact from the breaker or contactor prevents
the relay from detecting additional starts when an unloaded motor is loaded, or issuing a block start after an unloaded
motor is started and running at less than 5% CT rated primary current.
If "Starter Auxiliary A" is chosen, terminals D16 and D23 are monitored to detect the breaker or contactor state, open signi-
fying the breaker or contactor is open and shorted signifying closed. The 469 will then determine that a motor has made the
transition from 'running' to 'stopped' only when the measured current is less than 5% CT ratio and the 'a' contact is open.
If "Starter Auxiliary B" is chosen, terminals D16 and D23 are monitored to detect the breaker or contactor state, open signi-
fying the breaker or contactor is closed and shorted signifying open. The 469 then determines that a motor has made the
transition from 'running' to 'stopped' only when the measured current is less than 5% CT ratio and the 'b' contact is closed.
GE Multilin
Courtesy of NationalSwitchgear.com
Õ

STARTER STATUS

ð
STARTER STATUS SW:
ENTER
ESCAPE Starter Auxiliary A
469 Motor Management Relay
4.4 S3 DIGITAL INPUTS

4.4.1 DESCRIPTION

4.4.2 STARTER STATUS
Range: Starter Auxiliary A,
Starter Auxiliary B
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