Service Manual Damcos LPU: Emergency Operation of LPU V.2
SM 8000-100-01 Ed 04 February 2017
78
Firmly mounted hand pump
With a firmly mounted hand pump the following applies:
Emergency open a fail-open LPU
1. Open by-pass at the actuator or at the firmly mounted hand pump until the valve has reached
the desired position. Then close by-pass valve again.
2. If the actuator has been closed by remote control and power is still on “the keep closed” function
is activated and the LPU may start up trying to keep the actuator closed. You have to disconnect
power or remove close-command before manual operation is started.
The valve will now stay in position until operated with hand pump again or by remote control.
Emergency closing a fail-close actuator
1. Open by-pass at the actuator or at the firmly mounted hand pump until the valve has reached
the desired position. Then close by-pass valve again.
2. If the actuator has been opened by remote control and power is still on, “the keep open” func-
tion is activated and the LPU may start up trying to keep the actuator open. You have to discon-
nect power or remove open-command before manual operation is started.
The valve will now stay in position until operated with hand pump again or by remote control.
Emergency closing a fail-open LPU
or
Emergency opening of actuator
1. Turn the directional valve at the hand pump to position “OPEN”
2. Operate hand pump until the valve has reached the desired position.
The valve will now stay in position until operated with hand pump again or by remote control.
Emergency closing of a double acting actuator
1. Turn the directional valve at the hand pump to position “CLOSE”
2. Operate hand pump until the valve has reached the desired position.
The valve will now stay in position until operated with hand pump again or by remote control.
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