MULTIQUIP DCA Series - Exciter Field Resistance Measurement

GENERATOR SERVICE AND TROUBLESHOOTING MANUAL — REV. #0 (08/29/23) — PAGE 37
EXCITER FIELD RESISTANCE TEST
EXCITER FIELD RESISTANCE TEST
NOTICE
Before performing the exciter eld resistance test, the
6-pin plug (Figure 38) must be disconnected from the
CN1 receptacle on the AVR. If the reading indicates an
open circuit the component may have to be replaced
or repaired.
Figure 38. Exciter Field Resistance Check
EXAMPLE:
DCA-25SSIU4F = 17.6Ω
TURN
SELECTION
DIAL TO Ω
POSITION
6-PIN
PLUG
2
C J A
BKD
1
3
YELLOW
WHITE
ORANGE
GRAY
BLUE
RED
AVR
2
C J A
BKD
1
3
PLUG
2 1
A J C
DKB
3
CN1
CN2
CN3
CN4
RECEPTACLE
REAR VIEW
WIRE SIDE
5 4
6
1
1
NOTES:
WIRE COLOR SHOWN IS FOR
A DCA-25SSIU4F GENERATOR.
ALL OTHER DCA GENERATORS
USE BLACK WIRES.
DISCONNECT
RANGE
MIN MAX
MULTIMETER
Auto0 600
OFF
Hz
C
A
mA
uA
F
V
Hz
V
mV
Hz %REL
HOLD/LIGHT
10 A MAX
mAµA
COM
6-PIN
PLUG
Using a multimeter (Figure 38), check the resistance across
the J and K wire leads on the 6-pin plug as referenced
in Table 6, column D. The reading shoud be within 2–5
ohms of nominal. Be sure to place the selection dial on the
multimeter in the Ω position. Also be sure to unplug the
6-pin plug from the CN1 receptacle on the AVR.