WIRING DIAGRAMS
We recommend a fused independent supply for each actuator and it is very important that the power supply earth connection is made to prevent
the current-free voltage on the non-live pin preventing the actuator working. This current-free voltage disappears as soon as the motor runs, but
in non-earthed systems it can stop the J3C from working.
The position confirmation switches are volt free and can have a different voltage applied than the power supply voltage e.g. 220V/1ph power
supply, 24VDC for position confirmation. For ease, the schematic below shows the same voltage for both power and position confirmation. See
notes at the bottom of this page regarding use of the volt fee contacts (end of travel confirmation).
Function options with the J3C electric actuator:
J3C ON-OFF ELECTRIC ACTUATOR
Standard function is power open, power close. Stays put on
loss of external power. Power remains on at all times.
J3C FAILSAFE ELECTRIC ACTUATOR
Fails to pre-set position on loss of external power.
Power open, power close, fails to pre-set ‘safe’ position on
loss of external power using internal industrial trickle charged
rechargeable NiCad battery. Can be set to fail close or fail
open on loss of external power. The failsafe electric actuator
moves to the position command applied at the time external
power is restored.
J3C MODULATING ELECTRIC ACTUATOR
Movement proportional to input signal
Power is applied continuously. Movement of valve
actuator is then controlled by an internally fitted
digital positioner and is proportional to changes
supplied in an input control signal. This input
signal is typically 0-10VDC, or 4-20mA. An output
signal is supplied as standard providing closed
loop control. Fails closed on loss of control signal
(or see configuration options below), stays put on
loss of external power.
Configuration options:
1)
Closes on loss of control signal
2)
Opens on loss of control signal
3)
Stays put on loss of control signal
IMPORTANT NOTES
EXTERNAL POWER SUPPLY/ COMMAND SIGNALS, AND POWER SUPPLY SIZING
The J3C electric actuator is designed to have continuous (not pulsed) external power applied at all times. It’s internal thermostatic anti-condensation
heater uses the external power to function, so switching off the power at end of travel switches this protection off. Damage caused by the effects of
condensation is not covered by our warranty as we provide protection against it as standard.
It is imperative that the power supply has sufficient
capacity to drive the J3C electric actuator. Ensure that safety factor of 3 is used to cover inrush on start-up, and for increased draw over time as the
brushed DC motor wears.
Another issue with using the end of travel confirmation signals to switch off the command signals is that as they are set around 5 degrees ahead of
the final motor stop position (fully open, or fully closed), if used to switch off the power, the valve will not reach the final motor stop positions.
J3C FAILSAFE MODULATING ACTUATOR
Combination of failsafe & modulating kits above: Uses battery failsafe system and digital positioner plug and play function conversion kits to provide fail to
safe position function on loss of external power in a modulating application.
Page 10
J3C MODULATING and FAILSAFE MODULATING WIRING
②
③
①
N/-
L/+
VAC/VDC
External Power
+
-
+
4-20mA or
0-10VDC
Input
Output
4-20mA or
0-10VDC
Do not connect
③
①
②
Control Signal I/O
L/+
N/-
N/-
Note: Above dotted line is
customer supplied
Position Confirmation
CLOSE
OPEN
VAC/VDC
②
③
①
L/+
N/-
N/-
CLOSE
OPEN
②
③
①
N/-
L/+
OPEN
CLOSE
VAC/VDC
Note: Above line above is customer supplied
External Power
Position Confirmation
VAC/VDC
J3C ON-OFF & FAILSAFE WIRING
(Same connection for either)
②
③
①