172-65169MA-08 (MC-COS Multi-control Valve) 28 May 2010
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In the Event of a Power Outage
Make sure the power supply switch is OFF before carrying out work on
the wiring or inspections involving disassembly.
If such work is carried out with the power on, there is a danger that
equipment may malfunction or electric shock may occur, leading to
injury or other accidents.
CAUTION
1. When the power to the drive section has been cut off:
The drive section will stop at the position it was at just before the power was cut off.
As a result, the pressure of the steam supplied to the equipment will be maintained
at the pressure just before the power went off.
If the supply of steam needs to be stopped during a power outage, install an ON-
OFF valve on the primary side of the MC-COS.
2. When only the operation signal to the actuator has been cut off:
The actuator will rotate counter-clockwise to raise the adjustment screw to the 0%
or lower position. As a result, the multi-control valve will close, cutting off the
supply of steam to the secondary side.
3. When power is restored:
The adjustment screw will return to the position specified by the operation signals
from the controller.
Manual Operation
1) Before beginning manual operation, turn OFF the power to the drive section.
2) Using a wrench as shown in the figure below, slowly turn the adjustment screw. Be
careful not to apply too much force. (A torque of about 7 N
w
m (5 lbf·ft) will be
required to turn the adjustment screw with the wrench.)
3) Turning the adjustment screw clockwise when viewed from above will INCREASE
the secondary steam pressure.
4) Turning the pressure adjustment screw counter-clockwise when viewed from
above will DECREASE the secondary steam pressure.
Clockwise to
Increase Pressure
Counter-clockwise to
Decrease Pressure
