Installation Instructions

Document No: 129-553
Installation Instructions
December 22, 2011
8. Fasten the cover with the screws. See
Figure 8.
EA1344R1
M30 x 1.5
2
2
1
1
Figure 8.
The installation is now complete.
Wiring
All wiring must conform to NEC and local codes and
regulations.
Use earth ground isolating, step-down Class 2
transformers. Do not use auto transformers.
Determine the supply transformer rating by adding
the total VA of all actuators used. The maximum
rating for Class 2 step-down transformer is 100 VA. It
is recommended that no more than 10 actuators be
powered by one transformer.
SQD65U
To use a 0 to 1000 ohm input signal on terminal R,
the circuit board jumper R—M must be cut.
CAUTION:
If the circuit board jumper R–M is cut, you
cannot wire the R and M terminals on the
terminal block to re-establish the
connection.
The 0 to 1000 ohm signal is additive to the 0 to 10
Vdc control signal. For example, a controller
commanded to 2 Vdc (20%) plus a remote override
input to 300 ohms (30%) results in a position of 50%
stroke.
Figure 9. SQD65U Terminal Connections.
G, G0 24 Vac operating voltage
G System potential
G0 System neutral
Y 0 to 10 Vdc control signal
R Input for 0 to 1000 Ohm remote setting unit or
low temperature detection unit
M Measuring neutral
U Output for 0 to 10 Vdc position indication
WARNING:
Terminal connection G is 24 Vac HOT, not
ground.
CAUTIONS:
• G0 and G must be properly wired for
correct function and full life of the
actuator.
• If the actuator makes a buzzing noise
upon reaching setpoint, G and G0 are
improperly wired and should be
reversed.
SQD85.03U
NEUT
CONTROLLER
ACTUATOR
EARTH GROUND
ISOLATING CLASS 2
TRANSFORMER FOR
24 Vac POWER
120 Vac
1
0
Y2
Y1
G
24
Vac
EA0795R1
Figure 10. SQD85.03U Wiring.
G 24 Vac operating voltage (system potential)
Y1 Output shaft extends, valve opens
Y2 Output shaft retracts, valve closes
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