JOHNSON CONTROLS
92
FORM 201.30-ICOM1 (519)
ISSUE DATE: 05/22/2019
SECTION 6 - OPERATION
FIGURE 48 -
NEW 331-03478-XXX MICROBOARD
TP10 +24V
TP5 +15V
TP4 +12V
TP1 GND
U18 VSD
RS-485 Driver
VSD RX
VSD TX
Port 2
RX2
TX2
RS-232
to Printer
Power LED
Status
LED
TP3
+5V
TP2
+3.3V
SD
Card
Power
LED
U5 RTC/
BRAM
JP4 JP5 JP6 Remote
Setpoint Jumpers
Port 2
RS-485 to
E-Link
U26 Port 1
RS-485 Driver
U23 Port 2
RS-485 Driver
Port 1
Future
Native
BAS
LD19331
24VAC power is applied to the 331-03478-xxx mi-
croboard connector J12 and is then used to create the
various DC power sources required by the microboard
circuitry. If the chiller control is malfunctioning, the
power supply test points should be measured to deter-
mine the status of the microboard.
Power Supply Test Points
TP1 GND (Measure TP2, TP3, TP4 and TP5 in refer-
ence to this Test Point)
TP2 +3.3V [3.2 to 3.4VDC] provides power to the pro-
cessors
TP3 +5V [4.8 to 5.2VDC] power communiaction ports
2,3 and 4 and analog sensors
TP4 +12V [11.64 to 12.36VDC] powers the display
and backlight and is regulated to become the +5V
TP5 +15V [11.3 to 16.6VDC] powers the analog out-
puts to the EEV valves
Configuration Jumpers
The same configuration jumpers that existed on the
02478 are provided on the 03478.
JP4 Remote Temp Reset jumper position Pins 1 to 2
(left) = 4-20 mA, Pins 2 to 3 (right) = 0-10 VDC
JP5 Remote Current Limit jumper position Pins 1 to 2
(left) = 4-20 mA, Pins 2 to 3 (right) = 0-10 VDC
JP6 Remote Sound Limit jumper position (Pins 1 to 2
(left) = 4-20 mA, Pins 2 to 3 (right) = 0-10 VDC
Summary of Contents for YVWA
Page 155: ...JOHNSON CONTROLS 155 NOTES...
