Komatsu 830E-AC Shop Manual page 439

Checks with Key Switch OFF
5. With key switch OFF, verify 25VDC to ground
minimum for the following circuits:
11
11s onTB30
11L on CB30
11A on TB30
11SL on TB28
NOTE: The voltage should be at least 25VDC. If the
voltage is significantly low, check the battery circuits. If
the voltage is slightly low, install a battery charger.
6. Check circuit 11B1 voltage to ground.
The voltage should be approximately 12VDC.
7. Make sure that the CN1 connector on the power
supply is connected. Install the BATFU fuse.
8. Activate the battery disconnect switches and turn
on the ground level engine shutdown switch.
Make sure all circuit breakers are closed.
10. Use a digital multimeter to check the polarity of
the battery voltage at the BATFU fuse holder.
Connect the positive lead to BATP and the
negative lead to RTN.
The voltage at BATP should be +24V.
Checks with Key Switch ON
1. Deactivate the battery disconnect switches. Turn
the key switch ON.
2. Check the voltage of circuit 712 to ground.
The voltage should be 25VDC.
3. Check the voltage of circuit 71CK to ground.
The voltage should be 25VDC.
4. Turn control power switch (1, Figure 3-1) to ON.
Verify that all five green lights in the power supply
are lit.
5. Verify that the display on the DID panel is lit.
6. Check the voltage on the following circuits in the
auxiliary control cabinet. Voltage at each should
be at least 25VDC:
71 on TB32
71GE on TB22
E03018 10/06
CPU Battery Checks
NOTE: If battery voltage is low in either battery check,
refer to "Memory Backup Battery Replacement"
instructions on the following page.
AC Drive System Electrical Checkout Procedure
(Release 21 Software)
7. Verify the specified voltage to ground at the
following locations in the auxiliary control cabinet:
+15VDC at the 15PV wire on TB29 (from TCI,
supply to operator control pedals)
+15VDC at the 15V wire on TB21 (from TCI,
power to cab gauges)
+15VDC at the 15SPD, 15RWS and 15LWS
wires on TB21 (from TCI, power to front wheel
speed sensors)
Approximately 11VDC at the 10V wire on TB28
+15VDC at the 15VL wire on TB32
Approximately 14.8VDC at the 15SIM wire on
TB32.
8. Measure voltage between circuit 72E (+) (TB24)
and circuit 0 (-) (TB24-H) in the auxiliary control
cabinet.
The voltage should be 5VDC.
9. Install a jumper from 22F0 @ TB32 to ground.
The voltage should change to 7VDC.
10. Remove the jumper to 22F0.
11. Verify 12VDC to ground for the following circuits:
65
67C
67R
67P
12. Turn the control power switch to OFF.
13. Connect a VOM across the screws securing the
green plate on the edge of the PSC CPU card in
the ICP panel. Connect the positive lead to top
screw (2, Figure 3-2) and the negative lead to
bottom screw (4).
The value should be approximately 3.5 volts.
14. Connect a VOM across the screws securing the
green plate on the edge of the TCI CPU card in
the TCI panel. Connect the positive lead to top
screw (2) and the negative lead to bottom screw
(4).
The value should be approximately 3.5 volts.
E3-9