E3-26 Statex III Electrical Checkout Procedure 2/02 E03012
2. MOTOR 1 ARMATURE CURRENT - ISOA3 :. . . . . . motor 1 amps = 0.0
(Screen value amps = 1000 x input voltage).
a. Test zero offset on isolation amplifier. Place a digital voltmeter between terminals “D” (+) and
“F” (-) on ISOA3. With control power On and no other signal applied, meter should read:
Less than 30 millivolts.
b. Remove wire from input terminal “B” on ISOA3. Connect test jumpers from “G” (+15 volt) to
“A”, and from “C” to “F” on ISOA3 and measure the following:
Read +1.00 ±.05 volts from “D” to “F”.
PTU should read +1000 ±50 amps.
c. Remove jumper from terminal “G”.
d. Connect test jumper from “E” (-15 volt) to “A”.
Read -1.00 ±.05 volts from “D” to “F”.
PTU should read -1000 ±50 amps.
e. Remove jumpers and voltmeter. Reconnect wire to terminal “B”.
3. MOTOR 2 ARMATURE CURRENT - ISOA4 :. . . . . . motor 2 amps = 0.0
a. Repeat same test procedure used on motor 1 amps, except substitute ISOA4 instead of
ISOA3.
4. MOTOR FIELD CURRENT - ISOA5:. . . . . . . . . . motor field amps = 0.0
(Screen value amps = 400 x input voltage).
a. Test zero offset on isolation amplifier ISOA5, using same procedure as on motor 1 amps.
b. Remove wire from input terminal “B” on ISOA5. Connect test jumpers from “G” (+15 volt) to
“A”, and from “C” to “F” on ISOA5 and measure the following:
Read +1.00 ±.05 volts from D to F.
PTU should read +400 ±20 amps.
c. Remove jumper from terminal “G”.
d. Connect test jumpers from “E” (-15 volt) to “A”.
Read -1.00 ±.05 volts from “D” to “F”.
PTU should read -400 ±20 amps.
e. Remove jumpers and voltmeter. Reconnect wire to terminal “B”.
5. ALTERNATOR FIELD CURRENT - ISOA8 :. . . . . . . .alt field amps = 0.0
a. Repeat same test procedure used on motor field amps, except substitute ISOA8 instead of
ISOA5.
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