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7 TESTING
7.3 ADDITIONAL FUNCTIONAL TESTING
The 469 specification for overload curve timing accuracy is ±100 ms or ±2% of time to trip. Pickup accuracy is
as per the current inputs (±0.5% of 2 × CT when the injected current is less than 2 × CT and ±1% of 20 × CT
when the injected current is ≥ 2 × CT). Perform the steps below to verify accuracy.
1. Alter the following setpoints:
S2 SYSTEM SETUP\CURRENT SENSING\PHASE CT PRIMARY: 1000
S2 SYSTEM SETUP\ CURRENT SENSING \MOTOR FULL LOAD AMPS FLA: 1000
S5 THERMAL MODEL\THERMAL MODEL\SELECT CURVE STYLE: Standard
S5 THERMAL MODEL\THERMAL MODEL\OVERLOAD PICKUP LEVEL: 1.10
S5 THERMAL MODEL\THERMAL MODEL\UNBALANCE BIAS K FACTOR: 0
S5 THERMAL MODEL\THERMAL MODEL\HOT/COLD SAFE STALL RATIO: 1.00
S5 THERMAL MODEL\THERMAL MODEL\ENABLE RTD BIASING: No
S5 THERMAL MODEL\O/L CURVE SETUP\STANDARD OVERLOAD CURVE NUMBER: 4
2. Any trip must be reset prior to each test. Short the emergency restart terminals momentarily immediately
prior to each overload curve test to ensure that the thermal capacity used is zero. Failure to do so will
result in shorter trip times. Inject the current of the proper amplitude to obtain the values as shown and ver-
ify the trip times. Motor load may be viewed in:
A2 METERING DATA\CURRENT METERING
3. Thermal capacity used and estimated time to trip may be viewed in:
A1 STATUS\MOTOR STATUS
Table 7–14: OVERLOAD TEST (STANDARD CURVE #4)
AVERAGE PHASE
PICKUP
CURRENT
LEVEL
DISPLAYED
1050 A
1200 A
1750 A
3000 A
6000 A
10000 A
10.00
GE Power Management
EXPECTED
TIME TO TRIP
1.05
never
1.20
795.44 sec.
1.75
169.66 sec.
3.00
43.73 sec.
6.00
9.99 sec.
5.55 sec.
469 Motor Management Relay
7.3 ADDITIONAL FUNCTIONAL TESTING
7.3.1 OVERLOAD CURVE TEST
TOLERANCE
MEASURED
RANGE
TIME TO TRIP
n/a
779.53 to 811.35 sec.
166.27 to 173.05 sec.
42.86 to 44.60 sec.
9.79 to 10.19 sec.
5.44 to 5.66 sec.
7
7-9
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