GE Masoneilan 469 Series, Instruction Manual

Page: 309 / 348

CHAPTER 7: TESTING
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 7–11
7.3 Additional Functional Testing
7.3.1 Overload Curve Test
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.
 Alter the following settings:
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”
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.
 Verify the trip times.
Motor load may be viewed in:
A2 METERING DATA

CURRENT METERING
.
Thermal capacity used and estimated time to trip may be viewed in
A1 STATUS

MOTOR STATUS
.
7.3.2 Power Measurement Test
The specification for reactive and apparent power is ± 1% of × 2 × CT × VT × VT full
scale at I
avg
<
2
×
CT. Perform the steps below to verify accuracy.
AVERAGE
PHASE
CURRENT
DISPLAYED
PICKUP
LEVEL
EXPECTED
TIME TO
TRIP
TOLERANCE
RANGE
MEASURED
TIME TO
TRIP
1050 A 1.05 never n/a
1200 A 1.20 795.44 sec. 779.53 to 811.35 sec.
1750 A 1.75 169.66 sec. 166.27 to 173.05 sec.
3000 A 3.00 43.73 sec. 42.86 to 44.60 sec.
6000 A 6.00 9.99 sec. 9.79 to 10.19 sec.
10000 A 10.00 5.55 sec. 5.44 to 5.66 sec.
3