20
Operational functions
OFF
ON
1
2
3
4
5times
30sec
30sec
30sec
30sec
Overload detection
Pump operation
Run
Stop
Run
Stop
Leak detection
Pump operation
A leak is detected
OFF
ON
Protective functions
■ Interlock function (see page 32 & 47)
Interlock function works in the same way as the STOP function but uses a preference circuit. Use this function
for emergency stop.
■ Diaphragm rupture detection (see page 45)
The pump stops right after a built-in sensor detects a leak in the compartment at the back of the diaphragm. In
this condition, the operation LED lights in red colour. Replace a broken diaphragm as necessary. See page 63
for diaphragm replacement. To release this error condition, push the start/stop key (or the ESC key if the pump
is under the Profibus control.).
NOTE
This capacitance sensor does not work properly if liquid conductivity is 1mS/m or below. Before sending pure
water, oil or any other low-conductivity liquid, check the conductivity to see if it meets the minimum detection
level. If it is not satisfied, the leak sensor is no longer usable. In this case a leak from the drain port is the
only valid indicator. In either case, replace the diaphragm immediately when a leak is found.
■ Pressure overload/Failed rotation control detection
The pump stops with the red operation LED blinking when a built-in pressure sensor detects 1.3-2.0 times high
-
er discharge pressure than the maximum level or when the hole IC which monitors the motor rotation has failed.
If
the pump is suspended (by the over-current protection) in either condition, the pump resumes operation 30
seconds later. If the suspended operation has recurred 5 times consecutively, the pump will not resume opera
-
tion any more and will keep still. These error conditions can be released when the start/stop key is pushed once.
NOTE
The discharge pressure can rise 1.3-2.0 times higher than the maximum allowable level of the pump de
-
pending on operating conditions and piping layouts. Also, if the pressure rises too sharp (with the closed dis
-
charge), it may not be even detected or curbed by the over-current protection. Set up a relief valve to protect
the related devices on the discharge line from the possible pressure rise if their pressure resistance is low.
