Mle-71Maa Actuators; Start Up Sequence; Auto Cycle Sequence; Electrical Override - Honeywell VPI Series Installation Instruction

VPI PRESSURE INDEPENDENT CONTROL VALVES & ACTUATORS

MLE-71MAA Actuators

Start Up Sequence

When power to the actuator is turned On, the actuator will automatically calibrate to determine the closing point.
Hereafter it will proceed to the normal operation mode (according to control signal).
For the failsafe version, capacitor charging will be prioritized (max. 120 sec depending on capacitor energy level) during
start-up and repowering. After completion of the charging mode followed by calibration mode, the actuator will proceed
to the normal operation mode.

Auto Cycle Sequence

Auto Cycle can be activated during commissioning. It prevents the valve from jamming when the valve is not moved for
a longer period of inactivity. By moving DIP switch #1 from OFF to ON, Auto-Cycle is activated. The actuator will then
perform a 50% stroke cycle every 3 weeks if no stroke movement has occurred.

Electrical Override

By moving DIP switch #6 from OFF to ON, electrical override is activated, and the actuator will open the valve fully.
During an 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.
Failsafe Mode
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 the return of power. Upon power, the. actuator remains in the final failsafe position until charging mode
is reached (max. 60 sec). Hereafter the actuator will return to the normal operation mode.
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