23
7. Technical data
Supply voltage
1 x 100-240 V –10%/+6%, 50/60 Hz, PE.
Power consumption
5 W.
Back-up fuse
Maximum 16 A.
Current consumption
Maximum 130 mA.
Mains borne signalling
Frequency shift keying (FSK).
(132.45 kHz, ±0.6 kHz).
Enclosure class
IP 55.
Maximum length between CU 301 and pump
200 metres.
Ambient temperature
• During operation: –30 to +50°C
(must not be exposed to direct sunlight).
• During storage: –30 to +60°C.
Weight
2.0 kg.
Relative air humidity
Maximum 95%.
Materials
The CU 301 box is made of black PPO.
EMC (electromagnetic compatibility)
According to EN 55 014 and EN 55 014-2.
Dimensional sketch
Fig. 19
Sensor input
13. The CU 301 in-
dicates “Sen-
sor defective”.
a) The pressure
sensor is defec-
tive.
Check that the sensor is installed correctly.
Check that the R100 setting of the sensor is correct, see section
5.3.1.
Check that the R100 setting of the sensor is correct.
If the sensor type is 4-20 mA, measure the signal current.
If the current is above 2 mA, the sensor and wiring are OK.
If the current is below 2 mA, the sensor or wiring is defective.
Replace defective parts.
Are the LED “Sensor defective” and the LED, pos. 1, on? See
section 4. Position of LEDs and fuse.
Yes: The total load of 24 VDC from terminal 5 is above 100 mA.
Disconnect the sensor in order to determine if it is defective.
Replace defective sensor.
No: The load is OK, but the CU 301 sensor input may be defec-
tive.
14. The pump is
operating on/
off.
a) No communica-
tion.
Check that the LED “No contact to pump” is on.
If so, the control unit CU 301 starts and stops the pump, based
on the sensor signal only. The CU 301 has to be reset every
250 stops.
Refer to fault no. 5 for remedy.
TM01 7842 4999 / TM01 7864 4999
External sensor
Voltage signal:
0-10 VDC/2-10 VDC, R
i
= 11 kΩ.
Tolerance: ±3% at maximum voltage signal.
Screened cable is recommended.
Maximum cable length: 500 m.
Current signal:
DC 0-20 mA/4-20 mA, R
i
= 500 Ω.
Tolerance: ±3% at maximum current signal.
Screened cable is recommended.
Maximum cable length: 500 m.
232
114
195
bar
5.0
4.5
4.0
3.5
3.0
2.5
2.0
104.5
104.5
100
140.5
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