Fig. 8. Manual override of ML7295 Spring
Return Direct Coupled Actuators.
Auxiliary Switches (ML7295C,H only)
The ML7295C,H models have line voltage, fully adjustable
auxiliary switches. The switch setting interval (or differential)
The switches are set as follows:
1. If the power is on, turn it off; the actuator will spring
return to the 0° position.
If the shaft coupling has been adjusted according to
the Range Stop Adjustment instructions, the position
indicator must also be adjusted to indicate 0 at the
fail-safe position. If this is not done, the position
indicator will not correspond to the auxiliary switch
adjustment settings, as shown on the label.
2. Use a flat blade screwdriver to turn the switch
adjustment dials to the desired settings.
ML7295 SPRING RETURN DIRECT COUPLED ACTUATORS
LOCKING IN PLACE
NOTE: The numerical indication on the dials corresonds to
the location of the shaft coupling at which a signal
will be given by the switch (see Fig. 9).
Once power is restored, the actuator will return to normal
10° 20° 30°
0° 10° 20° 30°
Fig. 9. Actuator rotary range and auxiliiary switch
To perform a checkout of the ML7295 DCA, proceed as
1. Check the damper or valve position and make sure that
24 Vac is present on the red and black leadwires.
2. Apply the control signal to the appropriate leadwires to
move the damper or valve away from the fail-safe
position. The ML7295 should drive the damper or valve.
3. If the actuator does not run, remove power and
manually operate the actuator, see Manual Override
section. If the shaft coupling moves, rotate it reaches
the mechanical stop. Turn the lock pin 1/4 turn to lock
the actuator in place. Reapply power and apply the
control signal to the appropriate leadwires to drive the
actuator in a cw direction.
4. If the actuator is correctly installed and still does not
run, replace the actuator.
60° 70° 80° 90°
60° 70° 80° 90°