Screwing The Sensor Into The Dosing Head; Using The Contacts; Description Of The Device - Grundfos DMX 221 Manual De Instrucciones

1 1
K1 K2
L N
230 VAC /
115 VAC
Fig. 22 Electrical connection of the electronics

9.2.6 Screwing the sensor into the dosing head

• Screw the sensor from the lower side into the hole of the
dosing head flange (M14 x 1.5).
– Now the diaphragm leakage sensor is ready for start-up.
9.2.7 Start-up
Caution
Carry out a functional check before start-up!
Functional check
• Dip the sensor into water.
– Green and red LEDs are on:
Sensor and electronics are ready for operation!
– One or more LEDs are off:
Sensor or electronics is defective!
Call Grundfos service.
• Carefully dry the sensor.
– Only the green LED is still on:
Sensor and electronics are ready for operation!
– The red LED is still on:
Sensor or electronics is defective!
Call Grundfos service.
Warning
Do not open the electronics or sensor!
Repairs must only be carried out by authorised and
qualified personnel!

9.2.8 Using the contacts

• Terminals 6 and 7 (potential-loaded)
– for instance for switching off the pump in case of a
diaphragm leakage.
• Terminals 8, 9 and 10 (potential-free)
– for instance for triggering an alarm device.
S1
1 1 1 1 1
K3 K4 K5 K6 K7
PE PE N
Contact 1 (non floating
230 VAC / 115 VAC)
S2
1 1 1 1
K8 K9 K10
Yellow
Green
Contact 2
(floating)

9.2.9 Description of the device

There are a green and a red light-emitting diode (LED) at the
electronics.
• Green LED
– shows that the system is ready for operation.
– The LED is only on when the sensor is connected to the
electronics.
If the LED is off in this case, either the sensor or the cable is
defective or wrongly connected.
• Red LED
– shows that a diaphragm leakage has been detected.
– The green LED is still on.
9.2.10 Maintenance
Warning
Do not open the electronics or sensor!
Repairs must only be carried out by authorised and
qualified personnel!
Sensor
Optoelectronic sensor with 3 metres cable.
• Clean the sensor in case of malfunction.
• If the sensor still does not operate correctly, replace it.
Electronics
• No maintenance is possible by the user.
• If the electronics does not operate correctly, call Grundfos
service.
1 1
White
Sensor
19