Direct Current Ct Primary Rating - GE GEK-113045B Manual

5.2 SETPOINTS MENU
DC CT PRIM: 5 A
ENTER to modify
FUNCTION:
The primary ampere rating (not the ratio) stamped on the DC Current Transformer (DCCT) is entered here if
one turn is passed through the DCCT window. If more than one turn is used, divide the DCCT primary ampere
rating by the number of turns and enter this number here.
MOTOR TYPE:
Collector-Ring and Brushless
NOTE:
The DCCT is available as a separate accessory in the PG2SPM or PG4SPM packages along with the neces-
sary CM (calibration module). These packages are required for overtemperature or current loss protection.
The value entered here affects the valid range of the HIGH FIELD / HI EXC FIELD setpoint.
APPLICATION:
The standard DCCT200 (from PG2SPM package) has a rated 200 A primary and a 50 mA secondary (4000:1
ratio). The DCCT terminals connect to CM terminals 7 and 8 (the polarity not important). Multiple turns of field
cable through the DCCT window may be required to obtain the proper effective CT ratio. Determine your motor
5
rated field (or exciter field) current and use the following table to determine the number of field cable turns
through the DCCT and effective rating to enter as the DCCT PRIM setpoint.
Table 5–1: DCCT SETUP
DC FIELD AMPS
RANGE
1 to 3 A
3.01 to 8 A
8.01 to 15 A
15.01 to 24 A
24.01 to 34 A
34.01 to 60 A
60.01 to 75 A
75.01 to 100 A
100.1 to 133 A
133.1 to 154 A
5-
6
Courtesy of store.ips.us
Range: 5 to 1000 A
Step: 1
RECOMMENDED NUMBER OF
DCCT CABLE SIZE TURNS
18 AWG
16 AWG
10 AWG
8 AWG
6 AWG
4 AWG
2 AWG
2 AWG
1/0 AWG
2/0 AWG
SPM Synchronous Motor Protection and Control

5.2.13 DIRECT CURRENT CT PRIMARY RATING

DCCT PRIM
SETPOINT
40 5 A
20 10 A
10 20 A
6 33 A
4 50 A
2 100 A
2 100 A
1 200 A
1 200 A
1 200 A
5 SETPOINTS
GE Multilin