A3Pv Panel (17Fm458A2); Sensor Power Supply (Sps); Checks With Key Switch Off; Checks With Key Switch On - Komatsu 930E-2 Shop Manual

A3PV Panel (17FM458A2):

2. Measure the following resistances at the terminals
on the Alternator 3-phase Voltage Measuring
Module in the electrical cabinet (left side when
facing cabinet):
Terminal G to ground - Approximately 900
ohms
Terminal E to ground - Approximately 150
ohms
Terminal E (negative lead) to Terminal G
(positive lead) - Approximately 6K ohms.

Sensor Power Supply (SPS):

3. Measure the following resistances at the Sensor
Power Supply located in the center of the electri-
cal cabinet, above the terminal boards:
V ( +) P24VDC19 to ground: >100 ohms
VR ( +) RTN58 to ground: 0 ohms
S ( +) P24VDC14 to ground: >100 ohms
RS ( +) RTN57 to ground: 0 ohms
S (-) N24VDC14 to ground: >100 ohms
RS (-) RTN61 to ground: 0 ohms
V (-) N24VDC19 to ground: >100 ohms
VR (-) RTN60 to ground: 0 ohms
IN (-) RTN59 to ground: 0 ohms
IN (+) BP24V03 to ground: >100 ohms
4. Preparation continued.
a. Verify key switch is OFF, batteries are con-
nected and the battery disconnect switches
closed.
b. Verify all circuit breakers are closed.
c. Ground level shutdown/prop lock out switch
must be closed (Run position).

Checks with Key Switch OFF:

5. With key switch OFF, verify 25.0 volts to ground
minimum at the location shown in parenthesis on
the following circuits:
11 (Front wall, Electrical Interface Cabinet)
11S (TB30)
11L (CB30)
11A (TB30)
11SL (TB28)
E3-8 AC Drive System Electrical Checkout Procedure
(Release 17 Software)
NOTE: The voltage should be 25.0 volts minimum. If
voltage is significantly low, check battery circuits. If
voltage is slightly low, install a battery charger.
6. Check and record circuit 11B1 voltage to ground.
Read approximately 12V DC.
7. Using a digital multimeter, check polarity at the
BATFU fuse holder.
With the leads on BATP (positive lead) and
RTN (negative lead) meter should indicate
BATP is positive.
8. Turn the Key Switch ON.
9. Check Circuit 712 to ground.
Voltage should equal the Circuit 11 value in
step 5.
10. Turn the Key Switch OFF. Open the battery
disconnect switches.
11. Reinstall the 50 amp fuse (BATFU).

Checks with Key Switch ON:

1. Close the battery disconnect switches. Turn key
switch ON.
2. Turn ON the Control Power Switch (CPS) in the
Information Display Panel on the side of the con-
trol cabinet.
3. Measure voltage between the circuits listed below
and cabinet ground:
At A3PV (17FM458 panel, left side of con-
trol cabinet), measure +15VDC at terminal
G (circuit P15VDC04).
At A3PV, measure -15VDC at terminal E
(circuit N15VDC04).
4. Measure and verify the specified voltage to
ground at the following locations in the Electrical
Interface cabinet:
+15 volts at the 15PV wire on TB29. (From
TCI, supply to operator control pedals)
+15 volts at the 15V wire on TB21.(From
TCI, power to cab gauges)
Approximately 11 volts at the 10V wire on
TB28.
If truck is equipped with Komatsu or MTU/DDC
16V4000 engine, measure the following:
+15 volts at the 15VL wire on TB32.
Approximately 14.8 volts at the 15SIM wire
on TB32.
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