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7.2 HARDWARE FUNCTIONAL TESTING
The 469 specification for GE Power Management 50:0.025 ground current input accuracy is ±0.5% of CT rated
primary (25 A). Perform the steps below to verify accuracy.
1. Alter the following setpoint:
S2 SYSTEM SETUP\CURRENT SENSING\GROUND CT: 50:0.025
2. Measured values should be ±0.125 A. Inject the values shown in the table below either as primary values
into a GE Power Management 50:0.025 Core Balance CT or as secondary values that simulate the core
balance CT. Verify accuracy of the measured values. View the measured values in:
A2 METERING DATA\CURRENT METERING
Table 7–5: 50:0.025 CT GROUND CURRENT TEST
PRIMARY
INJECTED
CURRENT
0.25 A
1 A
10 A
25 A
The 469 specification for RTD input accuracy is ±2°. Perform the steps below to verify accuracy.
1. Alter the following setpoints:
S8 RTD TEMPERATURE\RTD TYPE\STATOR RTD TYPE: 100 ohm Platinum (select desired type)
S8 RTD TEMPERATURE\RTD #1\RTD #1 APPLICATION: Stator (repeat for RTDs 2 to 12)
2. Measured values should be ±2°C or ±4°F. Alter the resistances applied to the RTD inputs as per the table
below to simulate RTDs and verify accuracy of the measured values. View the measured values in:
7
A2 METERING DATA\TEMPERATURE
Table 7–6: 100 Ω PLATINUM TEST
APPLIED
RESISTANCE
TEMPERATURE READING
100 Ω
° CELSIUS
PLATINUM
80.31 Ω
–50°C
100.00 Ω
119.39 Ω
50°C
138.50 Ω
100°C
157.32 Ω
150°C
175.84 Ω
200°C
194.08 Ω
250°C
7-4
7.2.4 GE POWER MANAGEMENT 50:0.025 GROUND ACCURACY TEST
SECONDARY
EXPECTED
INJECTED
CURRENT
CURRENT
0.125 mA
0.5 mA
5 mA
12.5 mA
EXPECTED RTD
° FAHRENHEIT
–58°F
0°C
32°F
122°F
212°F
302°F
392°F
482°F
469 Motor Management Relay
MEASURED
GROUND
READING
CURRENT
0.25 A
1.00 A
10.00 A
25.00 A
MEASURED RTD TEMPERATURE
SELECT ONE: ____( °C ) ____( °F )
1
2
3
4
5
7 TESTING
7.2.5 RTD ACCURACY TEST
6
7
8
9
10
GE Power Management
11
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