− 7 −
(1) Pump operation:
①
When proximity switch R input is on, solenoid valve operation output keeps ON condition.
②
Even if proximity switch R input is off, solenoid valve operation output keeps ON condition.
③
At the condition of proximity switch L input is on, solenoid valve operation output becomes off.
④
Then, until proximity switch R input comes on, solenoid valve operation output keeps off condition.
⑤
The above operations (
①
~
④
) shall be repeated in order.
②
①
Proximity switch L
Proximity switch R
Solenoid valve
operation output L
Solenoid valve
operation output R
(2) Flow rate control:
1 shot flow rate for F pump has been arranged; discharge capacity shall be “pump stroke rate times 1 shot flow rate”.
When the flow rate was set arbitrarily, stroke rate shall be converted automatically within the controller. Comparing
this converted stroke rate and operating cycle of proximity switch, which is effected to input into controller while
pump is operating, control voltage (DC0~10V) to Electro-pneumatic regulator (ER1) shall be adjusted. Varying
secondary air pressure of electro-pneumatic regulator (ER1), discharge capacity shall be controlled.
(3) Leak alarm:
This function effects to stop pump with alarm signal when pump brings about leakage.
It detects leakage and makes output signal by that leaked liquid conducts between electrodes (C1- C2 or D1-D2) of
which set up corresponding to each bellows (left and right).
Receiving this alarm, the controller effects warning, and put control signal off to Electro-pneumatic regulator
simultaneously. Then, it makes stop pump.
On this occasion, pneumatic pressure to drive inside of pump shall be released and becomes no-pressure only when
Electro-pneumatic regulator (optional) is being used.
(4) Time up alarm:
This function effect to alarm when pump stops or stroke speed becomes abnormally slow down for some reason.
Output for solenoid valve still keeps operating condition, though. Time set for criterion of warning shall be
executed on setting screen No.8.
It makes output as an alarm in case of whatever longer stroke time (t1, t2 and t3), than preset time t0. When all of
t1, t2 and t3 become shorter than t0, this alarm shall be reset automatically, and starts operation again.
5. Explanation of work
t
1
t
2
t
3
t
0
t
0
t
0
Proximity switch L
Proximity switch R
Time up alarm
