Kohler M340+ User Manual

4-7
Controller Troubleshooting
TP-5672 11/95
7. When the message on the LCD again reads,
N-AUTO-ZERO?,restorethenormalpowersource.
8. If single-phase sensing is used, perform this step.
PresstheMENUArrowDownkeysotheLCDreads
N-VOLT VAC. If the value displayed on the LCD
after N-VOLT VAC is not between 60%and 80% of
the system voltage, replace the logic board
assembly. If the value is between 60% and 80% of
the system voltage, measure the normal system
voltagebyconnectingonetestleadofavoltmeterto
TB-AC1-NAand theother test leadto TB-AC1-NC.
Enter the measured value at the LCD message
N-VOLT VAC. Press the ENTER key and observe
the ENTRY ACCEPTED message on the LCD.
9. If three-phase sensing is used, perform this step.
PresstheMENUArrowDownkeysotheLCDreads
N-PHA-CVAC. If thevalues displayedon theLCD
after N-PH A-C VAC, N-PHA-B VAC, or N-PHB-C
VAC are not between 60% and 80% of the system
voltage, replace the logic board assembly. If the
values are between 60% and 80% of the system
voltage, measure and enter the normal system
voltage by performing the next three steps.
a. Connect one test lead of a voltmeter to
TB-AC1-NA. Connect the other test lead to
TB-AC1-NB. Enter the measured value at the
LCD message N-PH A-B VAC. Press the
ENTER key. Observe the ENTRY ACCEPTED
message on the LCD. Press the MENU arrow
down key.
b. Connect one test lead to TB-AC1-NB, and
connecttheothertestleadtoTB-AC1-NC.Enter
the measured value at the LCD message N-PH
B-C VAC. Press the ENTER key. Observe the
ENTRY ACCEPTED message on the LCD.
Press the MENU arrow down key.
c. Connect one test lead to TB-AC1-NA, and
connecttheothertestleadtoTB-AC1-NC.Enter
the measured value at the LCD message N-PH
A-C VAC. Press the ENTER key. Observe the
ENTRY ACCEPTED message on the LCD.
Press the MENU arrow down key.
10. Press the RESET MENU key and then the ENTER
key to store the set points.
NOTE
If the system will not calibrate, replace the logic
board assembly.
Calibrate Logic Board Normal
Single-Phase Source
NOTE
When calibrating either the normal source or
emergency source, never auto-zero the source
unless it is zero volts. If source voltage is present
and the YES key is pressed and entered at the
AUTO-ZERO message, the logic board will always
read the system voltage as zero volts.
1. Using the menu in Index 12, arrow down to
N-AUTO-ZERO?. Press the YES key and the
ENTER key.
2. Observe the ENTRY ACCEPTED message on the
LCD.
3. When the message on the LCD again reads,
N-AUTO-ZERO?,restorethenormalpowersource.
4. PresstheMENUArrowDownkeysotheLCDreads
N-VOLT VAC. If the value displayed on the LCD
after N-VOLT VAC is not between 60%and 80% of
the system voltage, replace the logic board
assembly. If the value is between 60% and 80% of
the system voltage, measure the normal system
voltagebyconnectingonetestleadofavoltmeterto
TB-AC1-NAand theother test leadto TB-AC1-NC.
Enter the measured value at the LCD message
N-VOLT VAC. Press the ENTER key and observe
the ENTRY ACCEPTED message on the LCD.
5. Press theRESET MENUkey and then the ENTER
key to store the set points.
NOTE
If the system will not calibrate, replace the logic
board assembly.

Kohler M340+ Specifications

General

Brand	Kohler
Model	M340+
Category	Switch
Language	English