172-65188M-08 (
M-COS 3,16,21
Pressure Reducing Valve) 24 Jun 2015
18
Controller Operation
<MC-2>
(7) Maximum Allowable Pressure Setting Knob
(4) Maximum Allowable Pressure LED
(2) Pressure Setting Lever Switch
(3) Pressure Lock Switch
(1) Power Switch
(1) Power Supply LED
(5) Pressure Indicator
(6) Selector Switch
Part Names and Features
NOTE: Pressure values in parentheses ( ) are for the 500 kPa (0.5 MPaG) model.
(1) Power Switch/Power Supply LED
This is the main switch for the entire controller unit. By turning ON the power
switch, the power supply LED is lit to indicate that power is supplied to the unit.
(2) Pressure Setting Lever Switch
This switch is used for adjusting steam pressure. By pushing the lever switch
toward the UP side, the pressure-adjustment screw in the
M-COS
unit is pushed
in (rotates clockwise from top-down view), causing the secondary pressure to rise.
Conversely, by pushing it toward the DOWN side, the pressure-adjustment screw
is pulled back (rotates counterclockwise from top-down view) causing the
pressure to fall. (By releasing your hand, the switch returns to the OFF condition.)
NOTE:
Do not operate the lever switch continuously for more than 5 minutes.
If the motor is run beyond that limit, the thermal protector for the motor is
activated to bring the motor to a standstill. (Motor condition is restored to
normal when the motor has cooled.)
(3) Pressure Lock Switch
When the pressure lock switch is turned to “LOCK ON”, the pressure setting lever
switch becomes inoperative.
When the “set pressure” valve is to be fixed at a certain level, turn this switch ON.
Then, even if the set pressure lever switch is operated by mistake, the set value
will not change. (Turn the pressure lock switch OFF if it is desired to change the
set value.)
(4) Maximum Allowable Pressure LED
The LED lights up when the maximum allowable pressure switch is activated.
Once the pressure switch LED is ON, the UP side of the pressure setting lever
switch becomes inoperative, thereby disabling setting of pressures higher than
that which has been set on the pressure switch.
(If it is desired to set the upper limit pressure for the protection of the steam-
using equipment, connect a suitable pressure switch externally.)
