R7426D UNIVERSAL INPUT CONTROLLER
EN1B-0204GE51 R0403
2
WIRING
Screwless type, spring loaded terminals are provided on the
controllers for wiring. These terminals are suitable for solid
conductors as well as tinned or with multicore cable end,
stranded wires up to 1.5mm
2
. To make a termination, push
the wire into the terminal or insert a small screwdriver from
the front of the controller into the spring-release hole and
insert the wire. Check for proper connection by short pull on
the wire.
Wiring should be done only according to the actual job wiring
diagrams or wiring diagrams shown in the mounting
instruction sheet EN1B-0202GE51. The wiring to the
CPA/SPA potentiometers is described in Table 1. All wiring
must conform to local applicable codes, ordinances, and
regulations. The maximum allowed wiring length per wire size
are shown in Table 2.
POWER SUPPLY AND GROUNDING
1. Refer to job drawings and verify correct supply voltage to
transformer (230Vac) and controller (24Vac).
2. Connect line power conductors to transformer primary.
Line power must be supplied from a breaker panel with
dedicated controller circuit. Do not turn the line power on
until all wiring has been checked against job drawings.
3. Connect transformers 24Vac secondary to the controller
terminals 18 and 19. Connect one conductor to terminal
marked 24V
∼
and the other to terminal marked 24V
⊥
. If
controllers are interconnected all terminals 19 must be
connected to the same potential 24V
⊥
level.
W 303
Fig. 2. Parallel Connection of Compensation Sensor T3
Controller to CPA/SPA Potentiometer
R7426D
43193982-001
Terminal 2
Terminal 3
Terminal 4
Terminal 1
Table 1.
Terminal Connection
Wiring run
Type of
Length max.
wires
1.0mm
2
1.5mm
2
From controller to
all input and
output devices
local
standard
100m
150m
Table 2. Wire Dimensions
Jumper
1)
State
Description
W303
closed
open
T3 supplied by this controller
T3 supplied from another controller
1)
Default jumper position = closed
Only cut (open) jumper W303, if the T3 input is fed from
another controller (parallel connection, max. 6 devices).
This disconnects the T3 input from the internal power
supply.
