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CPC transformer (P/N 640-0080) is a multi-
tapped primary transformer that may be used
with the MultiFlex ESR board.
Refer to Figure 3-1 and follow the instructions
below for transformer power wiring:
1.
Connect the three wires from the secondary
side of the transformer to the power connec-
tor. The AC should be run with a minimum of
18 AWG wire up to 10 feet, 16 AWG up to 20
feet, or 14 AWG up to 30 feet.
2.
Connect 24VAC to AC1 and AC2.
3.
Connect the center tap (CT) of the transform-
er to the GND center terminal of the power
connector.
4.
Attach an additional 14 AWG or larger wire
from the center GND terminal to solid earth
ground. Keep the wire as short as possible, 6"
or less is preferred, and should be completed
for each board.
Use 24VAC Center-Tapped Transformer
WIRING FOR 640-0080, 80VA Transformer
Power Wiring Types:
14 AWG
18 AWG
120/208/240 VAC
L2
240
PRIMARY SIDE
Three-conductor non-shielded cables
are the recommended wire
for connecting between the
center-tapped transformer
and I/O boards.
SECONDARY SIDE
24V
Figure 3-1 - Power Wiring - Center-Tapped Transformer
3.2.
Valve Wiring
The stepper valves are wired to the board by
connecting the stepper valve harness to one of
the eight screw terminal connectors along the
top of the board (Figure 3-3) and matching the
wire colors to the legend on the connectors. Use
3 • MultiFlex ESR I&O Manual
Belden 9495
Belden 9493
L1
C
208
120
AC1
24VAC Center-Tapped
GND
AC2
Earth ground the
GND (center-tapped)
terminal of each board
CT
24V
the cable and cable harnesses that are supplied
with the valves.
Wire Color Legend on
Each Valve Connector (8)
R
BLK W
BLU
Figure 3-2 - Valve Connector Wire Color Indicator
BLUE
BLACK
RED
Match wire colors to
silk screen legend on
WHITE
board terminals
MultiFlex ESR Board w/ Eight
Screw Terminal Connectors
(P/N 810-3199)
Figure 3-3 - ECT Flow Valve and New Board Wiring Diagram
For Sporlan valves, match all wire colors except
the green wire. Instead, connect the green wire
to the silk screen blue wire legend (Figure 3-2).
3.2.1. Molex Connector (Discontinued)
Board Wiring
The stepper valves are wired to the board by
connecting the stepper valve molex connector to
one of the eight molex connectors along the top
of the board (Figure 3-4). Use the cable and
cable harnesses that are supplied with the valves.
NOTE: A valve cable harness may not be lon-
ger than 150 feet.
Stepper Valve
Harness
ECT Flow
Stepper Valve
026-1720 Rev 4 06-APR-2010
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