Kohler M340+ - Specific Accessory Troubleshooting

4-23
Controller Troubleshooting
TP-5672 11/95
Inphase Monitor
Motors and related equipment can be damaged by
abnormal inrush currents when switched between two
livepowersources. ThepurposeoftheInphaseMonitor,
DD-34-A, is to minimize abnormal inrush currents to
equipment when the equipment is connected to a new
power source. The Inphase Monitor samples a single
phaseof onesourceandcomparesittoasinglephaseof
another source. When the two voltages are within the
desired phase angleand approaching zero phaseangle
difference, the Inphase Monitor signals the transfer
switch to operate. The transfer may be from utility to
generator, from generator to generator, or from utility to
utility. To enable this option, the IN-PHASE MONITOR
jumper must be installed on the main logic board. See
Figure 4-15.
NOTE
Thegeneratorsetshouldrun0.5Hzfasterthantheutility
source. InphaseMonitorcanbeenabledonlyontransfer
switches with power conversion units without an Off
position like ZENITH STD.
Figure 4-19shows a wiring diagram for this option. See
Figure 4-20 for troubleshooting this option.
17
1
TB--DC1TB--AC1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
NA
NB
NC
EA
EB
EC
LA
LB
LC
NAS
NCS
EAS
ECS
MICROCONTROLLER
MANUAL
TIME
PLANT
VOLT/
PHASE
IN--PHASE
OVRIDE
DELAY
EXER
FREQ
SEQUENCER
MONITOR
Programming Shunt (294634)
560458
OFF
DELAYS
must be installed to activate accessory
Figure 4-19. Wiring Diagram—Inphase monitor, option DD-34-A
No
No
No
Yes
Yes
No
No
Yes
Replace logic board.
If a connected source fails partially (not
all voltages on all phases below the
undervoltage dropout setpoints) or after
normal source restoration when
connected to emergency, the ATS starts
an automatic transfer sequence to the
other source.
Does the In-phase Monitor LED light
1. After TDNE ends and before transfer
to emergency or
2. After TDEN ends and before transfer
to normal?
Do the emergency
and normal power
sources have the
same phase
rotation?
Rewire the phase rotation of
the emergency source to
match the normal source, or
both to A-B-C when practical.
Replace logic board.
Yes
Is the In-phase Monitor jumper
installed in JP1 on the logic board?
No
Install the In-phase Monitor jumper
on JP1 and power down the
controller for 1 minute mininum.
In Index 11 is Inphase
Monitor enabled?
Troubleshoot shunt-jumper
controlled options. See Figure 4-18.
Does the ATS transfer
to the other source in
a few seconds and in
phase?
In-phase monitor is working.
Are the normal and emergency
sources within 0.5 Hz?
Adjust the generator
frequency 0.5 Hz
faster than the
normal source.
Yes
Yes
Figure 4-20. Troubleshooting—Inphase monitor, does not work