Grundfos CU 301 Installer Manual
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Grundfos CU 301 Installer Manual

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GRUNDFOS INSTRUCTIONS
CU 301
Installer's manual

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Summary of Contents for Grundfos CU 301

  • Page 1 GRUNDFOS INSTRUCTIONS CU 301 Installer’s manual...

  • Page 2: Table Of Contents

    Menu INSTALLATION 5.3.1 Sensor 5.3.2 Choice of sensor 5.3.3 Maximum pressure setting 5.3.4 Automatic restart 5.3.5 Dry-running stop 5.3.6 Maximum speed 5.3.7 Buttons on CU 301 5.3.8 Indication of pump operation 5.3.9 Number Fault finding Service Technical data Electrical connection 7.1.1 Mains supply...

  • Page 3: Constant-Pressure Control

    Pressure sensor SQE pump 1.2 Function The pressure is registered by means of the pressure sensor, which transmits a signal to the CU 301. The CU 301 adjusts the pump performance accordingly by changing the pump speed. Mains borne signalling: The communication between the CU 301 and the pump is effected via the power supply cable.
  • Page 4 Flow detection: During pump operation, i.e. when water is con- sumed, the CU 301 will adjust the pump speed to maintain a constant pressure. In order to stop the pump when no water is consumed, the CU 301 per- forms flow detection every 10 seconds.

  • Page 5: System Sizing

    Q = 0 m³/h, important that the pump is of the right type. Pump type 3,000 min 10,700 min During operation, the CU 301 controls the pump speed within the range from 3,000 min to 10,700 [m] / [feet] [m] / [feet] , see fig.

  • Page 6: Positioning The Pressure Sensor

    Example: A person is in the shower. Tap 2 is opened. The increased flow will cause pressure loss in the pipe, and even though the CU 301 is keeping the pressure constant at the pressure sensor, the person in the shower will feel the pressure loss.

  • Page 7: Operating Functions

    The CU 301 is communicat- 2.3 Pressure setting flashing. ing with the R100. The two arrow buttons on the CU 301 front are used for the pressure setting, see fig. 10. * If the on/off button has been used to stop the Fig. 10 pump, this button must also be used for restarting.

  • Page 8: Button Locking

    The alarm functions indicated on the Setting range: 2, 2.5 ... 5.0 bar. CU 301 front are described in the following sections. Arrow-up button: 3.1 Service alarm When this button is pressed, the system pressure If one or more factory-set alarm values are exceed- setting is increased in steps of 0.5 bar.

  • Page 9: Dry-Running Protection

    3.2 Dry-running protection The purpose of the dry-running protection is to pro- tect the pump in case of insufficient water flow. The dry-running protection makes the conventional dry-running protection unnecessary. No additional cables to the motor are required. The dry-running protection will be active after 30 seconds’...

  • Page 10: Position Of Leds And Fuse

    • Permanent red light when the supply voltage is out of range, see section 7. Technical data. • No contact to pump *) • Permanent red light when communication between the CU 301 and the pump is impossible. *) Press the on/off button to reset the alarm indication.

  • Page 11: Cu 301 With R100

    The R100 communicates via infra-red light. During communication, there must be visual contact be- tween the CU 301 and the R100. The best visual contact between the two units is obtained by pointing the R100 at the lower arrow button or by removing the front cover and pointing the R100 at the right side of the CU 301, see fig.
  • Page 12 Fig. 16...

  • Page 14: Menu Operation

    5.1 Menu OPERATION 5.1.3 Alarm The OPERATION menu for the CU 301 offers the possibility of setting and reading operating parame- ters. Factory settings are marked in bold-faced type under each individual display. 5.1.1 Pressure setting This display shows the types of alarm that may occur.

  • Page 15: Menu Status

    5.2 Menu STATUS 5.2.3 Speed The STATUS menu for the CU 301 provides operat- ing data about pump/motor and sensor. It is not pos- sible to change or set values in this menu. When [OK] is pressed continuously in this display, the displayed value is being updated.

  • Page 16: Operating Hours And Number Of Starts

    4-20 mA, 0-10 V, 2-10 V. The setting of this display overrules the possibility of • Setting range unit: bar, psi. using the arrow button on the CU 301 front to in- Setting range, bar: crease the pressure to a setting above the “Maxi- •...

  • Page 17: Automatic Restart

    680 W. • Motor type 1.1 to 1.73 kW, dry-running stop = 800 W. The buttons on the CU 301 can be set to: When the dry-running protection is to be active, the • Active. minimum value of the pump power input must be set •...

  • Page 18: Indication Of Pump Operation

    Setting range: “–” (not active), 1, 2, ... 64. Once a number setting has been made, the factory setting (not active) is no longer available. If the CU 301 and the pump do not have the same number, the alarm “No contact to pump” will be indi- cated.

  • Page 19: Fault Finding

    • No contact to pump. To identify the cause of the service alarm, it is necessary to remove the front cover from the CU 301. Fit the front cover as shown in fig. 18 to avoid disconnecting the multi-core cable.
  • Page 20 If the pump has not started yet, proceed as follows: • Press the on/off button for 5 seconds. If the pump starts, the CU 301 or the sensor may be defective. Note: The pressure is not controlled and may rise to a high level.
  • Page 21 12-14 inches or rewire using shielded cable. e) The CU 301 com- Are the three CU 301 supply board LEDs in pos. 2, 3 and 4 on munication part is and is the control indicator LED flashing? See section 4. Posi- defective.
  • Page 22 The voltage drop Replace the pump cable. in the pump ca- ble is too big. 10. The CU 301 in- Speed reduction is activated so as to maintain a reduced performance. dicates “Speed a) The pump is worn The pump must be serviced.

  • Page 23: Technical Data

    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 a) No communica- Check that the LED “No contact to pump”...

  • Page 24: Electrical Connection

    CU 301 must be connected in accordance with the local rules and standards in force for the application in question. The on/off button on the CU 301 must not be used as a safety switch when installing and servicing the pump.

  • Page 25: Mains Supply

    Fig. 20 POWER PUMP Legend: 7.1.2 Pump supply PUMP, terminals 3, 4 and PE: Pos. Description Connect terminals 3 and 4 to the phase and neutral leads of the pump. Each terminal can be connected Standard pressure sensor. to any of the two leads. + 24 VDC, brown lead, terminal 5.
  • Page 27 Jebel Ali Free Zone Co. Ltd. Poland Dubai Indonesia 22 Floor, Xin Hua Lian Building GRUNDFOS Pompy Sp. z o.o. Phone: +971-4- 8815 166 PT GRUNDFOS Pompa 755-775 Huai Hai Rd, (M) ul. Klonowa 23 Telefax: +971-4-8815 136 Jl. Rawa Sumur III, Blok III/CC-1 Shanghai 200020 Baranowo k.
  • Page 28 Being responsible is our foundation Thinking ahead makes it possible Innovation is the essence V7157770 0205 Repl. V7157770 0200 www.grundfos.com...

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