TP-6519 8/17 45Section 4 Controller
1
tp6196
1. 12 VDC power source
2. 12 VDC test lamp
3. SCR module
4. Jumper
5. 100--500 ohm resister
G1
AC2
AC1
G2
(+)
(--)
(+)
(--)
2
3
4
5
Figure 4-16 SCR Test
9. Connect the positive (+) lead from the DC power
source, with the lamp in series, to terminal AC1 on
the SCR module. The lamp should not glow.
10. Connect the jumper, with the resistor in series,
from the positive lead of the DC power source to
terminal G1 on the SCR module. The lamp should
glow.
11. Repeat steps 9 and 10, with the positive (+) lead
and lamp connected to terminal AC2 on the SCR
module, and connecting the jumper with resister to
terminal G2.
12. If any of the above checks indicates a failed SCR
module, replace the module.
Note: When replacing the SCR module, be sure to
apply thermal compound to the back of the
module to prevent overheating. Thermal
compound is provided with the SCR module
replacement kit.
4.9 Controller Replacement
If the troubleshooting procedures in Section 3 identify a
failed controller, use the procedure in this section for
controller r eplacement. Always check the controller
configuration, fuse, wiring, and connections before
replacing the controller. For output voltage problems,
replace the SCR module and check the operation again
before replacing the controller.
After replacing the controller, verify that the new
controller’s configuration settings match the generator
set system voltage/frequency and unit configuration.
Refer to the generator set installation manual for
instructions to check the controller c onfiguration and to
change the settings, if necessary.
After the controller configuration has been checked and
set to match the generator set, use a voltmeter to check
the generator set output voltage and frequency. If the
output voltage or frequency needs adjustment, use the
voltage and frequency adjustment procedure in
Section 5.8. Also see the frequency adjustment
procedure in Section 5.9.5.
Hazardous voltage.
Will cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
DANGER
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