234
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 27 - LARGE TONNAGE CHILLER (LTC) I/O BOARD 031-02895-000/001
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
Open Collector Outputs (-001 Board only)
There are 2 each open collector outputs.
is a detail of an output and is representa-
tive of all these outputs. Each output switches a ground
connection through an onboard solid state device to
an external load connected to the board su12
VDC power source. Each output is connected between
the resp12 VDC and DO(X) terminals.
OUTPUT CONNECTION
DO3
TB11-1 +12 VDC
-2 DO3
DO4
-3 +12 VDC
-4 DO4
FIGURE 88 -
OPEN COLLECTOR
LD14234
+12V
DO3
TB11
OPEN COLLECTOR
1
2
+12VDC
TB17
RELAY OUTPUTS
1
2
COM
DO1
NO
TB15
TRIAC OUTPUTS
1
2
RET
DO5
ANALOG INPUTS
There are 8 each Analog Inputs on the -000 board and
16 each on the -001 board.
a detail of this input and is representative of all these
inputs. Each input accepts either a 0 to 5 VDC, 0 to
10 VDC, 4 to 20mA, Transducer or Thermistor input.
The on-board software configures each input per the
requirements of the input type. The configuration con-
sists of selecting the appropriate input series resistor to
ground. The software closes the appropriate switch(s)
(1, 2, 3), selecting the appropriate input resistor.
shows the switch settings and resis-
tance values for each input type.
Inputs AI7 and AI8 have dual input connectors that al-
low either a pin/socket connection or screw terminal
connection as shown below.
Thermistors and transducers operate from the board
su5 VDC supply voltage. To compensate for
a v5 VDC supply voltage, this voltage is com-
pared to a p5 VDC reference. The output of the
device is adjusted according to any difference.
FIGURE 89 -
ANALOG INPUTS
LD14235A
J10
ANALOG INPUTS
1
2
3
+5VDC
11.5K
243
GND
GND
GND
+5VDC
AI1
RET
10K
OFF
ON
10K
10K
.33/UF
GND
GND
3
2
1
LOAD
RESISTOR
SELECT
FROM
PROCESSOR
(see notes below)
0-5VDC, TRANSDUCER, THERMISTOR
0-10VDC
THERMISTOR
4-20mA
1
OFF
OFF
OFF
ON
2
OFF
OFF
ON
OFF
3
OFF
ON
OFF
OFF
Resistor (Ohms)
10K
10K-11.5K
5K
243
