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To Replace ML6874
1. The ML6984 is a direct replacement for the old ML6874
in single actuator hook-up.
2. For parallel, multiple ML6874 actuators applications, an
isolation relay must be used. The isolation relay contacts
should be placed in the new ML6984 actuator signal
input "W" and "B" circuit.
To Replace Line Voltage Auxiliary
Switches
These accessories are no longer available. Replace the old
actuator with new model and 272630D position feedback/
auxiliary switch module.
Operate an external relay, such as R8845U, using the
adjustable SPDT pilot duty output on the 272630D.
If a second, independent output switch is needed, wire the 2-
10 Vdc position feedback signal to an Approved, adjustable,
voltage-controlled relay.
CHECKOUT
ML7984
1. Make sure the valve stem is completely screwed into the
actuator drive shaft with no threads showing before
applying power.
2. Make sure the valve stem is locked in place with the set
screw.
3. Make sure the Configuration DIP switches are set cor-
rectly.
4. With 24 Vac or 28 Vdc power source connected to T5
and T6, actuator operation can be verified by connecting
appropriate control signal (Series 70/90) from controller
to the signal input terminals (Figures 8 thru 16). For
direct acting: A modulating action can be obtained by
increasing the control signal. The actuator will travel from
stem down to stem up. On signal failure (disconnected/
no signal), actuator defaults to closed position. For
reverse acting: Decreasing controller signal will drive
ML6984, ML7984 SERIES 4000 DIRECT COUPLED VALVE ACTUATORS
actuator from full stem down to full stem up. On signal
failure (disconnect/no signal), actuator defaults to open
position.
5. Operate the system (valve, actuator, and controller) for
several cycles to ensure proper installation.
6. When checkout is complete, return the controller to the
desired setting.
NOTE:
1.
The Device will ignore any input changes until it
has completed its repositioning relative to the initial
signal input.
2.
272630D position feedback/auxiliary switch mod-
ule is inactive during self-calibration.
ML6984: 5-Wire Installation
1. Make sure the valve stem is completely screwed into the
actuator drive shaft with no threads showing before
applying power.
2. Make sure the valve stem is locked in place with the set
screw.
3. Connect 24 Vac or 28 Vdc power to T5 and T6.
4. Jumper R and B. The valve stem should move up.
5. Jumper R and W. The valve stem should move down.
6. For Floating operation, open R connection Valve stem
should remain in position.
7. Re-connect all control wiring.
8. Operate the system (valve, actuator, and controller) for
several cycles to ensure proper installation.
9. When checkout is complete, return the controller to the
desired setting.
ML6984: 3-Wire Installation
1. Make sure the valve stem is completely screwed into the
actuator drive shaft with no threads showing before
applying power.
2. Make sure the valve stem is locked in place with the set
screw.
3. Connect 24 Vac to T6.
4. Manually override the controller to signal the actuator to
open/close for a few cycles to ensure proper installation.
5. When checkout is complete, return the controller to the
desired setting.
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95C-10939EFS—03
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