VPI PRESSURE INDEPENDENT CONTROL VALVES & ACTUATORS
15 31-00383-01
Electrical Override (MLE75MAB)
By moving DIP switch #6 from OFF to ON, electrical override is activated, and the actuator will open valve fully.
During electrical override the LED indicator will blink red and green. When DIP switch #6 is moved back to OFF, the
actuator will re-calibrate and thereafter go into normal operation mode. Electrical override is performed with power
supply on.
Failsafe Mode (MLE75MAB)
When power is lost, the actuator will go into failsafe mode after a few seconds, mandatory that capacitor charging,
and start-up sequence are completed. The actuator will perform failsafe action (open or close) and stay in failsafe
final position until return of power. Upon power, the actuator remains in the final failsafe position until charging
mode is reached (max. 15 sec). Hereafter the actuator will return to normal operation mode.
MLP41TNA and MLP71TNA (Thermoelectric) Actuators
24V versions must be powered by a safety isolating transformer (for AC variant) according to EN 61558-2-6 or class
II FCC-quality proofed or a switching power supply (for DC variant) according to EN 61558-2-16. For MLP71TNA
actuator the power supply must have a maximum power output of 100VA.
Start-up Sequence
During FIRST TIME POWERING operating voltage must be applied for at least 6 minutes. Ensure to have the actuator
mounted on the valve, when powering as it has automatic stroke detection. To speed up a re-calibration of the stroke,
close (0V) the actuator for 30 minutes then open (10V) for 30 minutes and leave the power on for the next 24 hours.
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