45
SECTION 3 - MICROBOARD 031-01730-000
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS JCI COMPANY CONFIDENTIAL
3
7 - Compressor Motor Variable Speed Drive - Mo-
tor/Power Line frequency application.
ON: 50Hz.
OFF: 60Hz.
8 - Chilled Water Pump operation - Determines
Chilled Water Pump control contacts (I/O
Board TB2-44/45) operation when chiller shuts
down on various CYCLING shutdowns.
ON: Enhanced operation. Contacts open at
completion of System Coastdown after all shut-
downs except when it shuts down on LEAVING
CHILLED LIQUID - LOW TEMPERATURE,
MULTIUNIT CYCLING - CONTACTS OPEN
AND SYSTEM CYCLING - CONTACTS
OPEN.
OFF: Standard operation. Contacts open at
completion of System Coastdown after all
shutdowns except when chiller shuts down on
LEAVING CHILLED LIQUID - LOW TEM-
PERATURE. On Low Water temp shutdowns,
they remain closed, causing the pump to con-
tinue to run while the chiller is shutdown.
9 - Not Used.
10 - Not Used.
11 - Not Used.
12 - Watchdog Protection -Used in conjunction with
Program Jumper JP1 (see Program Jumpers
on page 42) to enable/disable the program
watchdog protection. With JP1 IN, this switch
setting has no effect. With JP1 OUT, this switch
setting determines whether the watchdog pro-
tection is enabled or disabled.
NEVER disable the watchdog protection!
Severe compressor or chiller damage
could result. The ability to disable the
watchdog protection is provided for YORK
factory testing only.
ON: Watchdog protection enabled.
OFF: Watchdog protection disabled.
FIGURE 13 - MICROBOARD LAMP DIMMER CIRCUIT
LD04054
NOTES:
1. J6-6 not connected (N.C.) to Backlight Inverter Board when display is manufactured by Sharp or NEC.
2. The position of Program Jumpers JP7 and JP8 determine the output at J6-7; In = Variable Voltage; Out = Variable Resistance.
Refer to Program Jumper Listing for applications.
3. Potentiometer is actually an integrated circuit that is the electrical equivalent of a 10KΩ potentiometer.
6
7
8
J6
BRIGHTNESS CONTROL (+) OR (N.C.)
BRIGHTNESS CONTROL (WIPER)
BRIGHTNESS CONTROL (-)
TO
BACKLIGHT
INVERTER
BOARD
JP8
JP7
5.0 VDC
10 K
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