Accessories - Grundfos

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<strong>Accessories</strong> BMB Product numbers Product number CU 3 - 3 x 400 V Current range for signal converter [A] 1-12 10-120 100-400 62500293 z 62500294 z 62500295 z CU 3 - 3 x 460 V 62500247 z 62500248 z 62500249 z CU 3 - 3 x 575 V 62500253 z 62500254 z 62500255 z Product Single-turn transformers CU 3 expansion possibilities Range Product number Sensor module SM 100 3 x 400 [V] 00626191 3 x 460 [V] 00626192 Communication module RS 485 - 00626159 DIN-Rail mounting 00626156 Remote control R100 HP printer for R100 Signal converter - - 00625333 00620480 1 - 12 [A] 00620497 10 - 120 [A] 00620498 100 - 400 [A] 00626148 Control functions This table describes the protection provided by CU 3. Control parameters Function Problem Advantages Ground failure Temperature Overvoltage/ undervoltage Overload Dry running Current unbalance Phase sequence Insulation resistance is measured only when the motor is not operating. A high-impedance voltage is applied to the motor leads and leakage to ground is measured. If the factory-set value is higher than the one measured, the motor cannot be started. Damaged or decomposed insulation in • motor, • cable or cable joint. • Overload, MS 4000 and MS 6000. • frequent starts/stops, The actual motor temperature is measured by means of the built-in Tempcon temperature transmitter and a signal is sent • operation against blocked to CU 3 via the phase leads. CU 3 compared the measured temperature discharge pipe, with the factory-set value. • insufficient flow velocity past the motor. If the factory-set values are exceeded, a fault indication is given. If the CU 3 receives a temperature signal, the voltage is no longer monitored, but the motor will continue to run. Therefore, the motor and consequently the pump operation will only be affected by voltage variations critical to the life of the motor. If there is no temperature signal, the motor will be stopped in case of overvoltage/undervoltage. The motor power input is measured on each of the three phases. The registered power input is an average of these three values. If the factory-set value is exceeded, the motor will stop. The motor power input is measured on each of the three phases. The registered power input is an average of these three values. If the average value is lower than the factory-set value, the motor will stop. The motor power input is measured on each of the three phases. CU 3 and motor are installed so that the phase sequence corresponds to correct direction of rotation. CU 3 monitors changes in the phase sequences. • The installation is close to a transformer, • the mains do not absorb load variations. • Incorrect dimensioning of pump/motor, • voltage supply failure, • defective cable, • blocking, • wear or corrosion. Pump exposed to dry running or underload, for example caused by wear. • Mains load is uneven, • incipient motor defect, • phase voltages diverging. Two phases are wrongly connected. • Possibility of indication of failure/of motor, cable and cable joint, • service indication. • Longer motor life, • safe operating conditions, • service indication. • Important installation parameter, • possibility of improving operating conditions. • Longer motor life, • safe operating conditions, • service indication. • Traditional dry-running protection is no longer necessary, • no extra cables. • Motor protection against overload, • service indication. Ensures correct pump performance. 42
<strong>Accessories</strong> BMB MTP 75 Motor protection Long motor life The MTP 75 protects against excessive motor temperature. This is the most simple and the most economical way of ensuring long motor life. The user is certain that operating conditions are observed and is given indication of the time when a service check should be made. Excessive motor temperature may be caused by: • Overload • Frequent starting/stopping (hunting) • Operation against closed valve/frozen discharge pipe • Insufficient flow of liquid past the motor • Pumping of water that is too hot • Deposits on the motor • Overvoltage • Undervoltage • Current unbalance • Dry running (Note that the pump is not protected if the water level is below the pump inlet. Application and installation The MTP 75 can be used only for motors with built-in temperature transmitter and should be installed for instance in a control cabinet. The MTP 75 may be installed in any type of control cabinet containing a thermal relay with differential release and contactor. The thermal relay is necessary to protect against blocking or phase failure, since this will cause the temperature to rise much faster than the MTP 75 is able to register. The MTP 75 is supplied with base for mounting on DIN rail. Operation The temperature transmitter will send a high-frequency signal indicating the motor temperature through the motor supply cable. The MTP 75 will stop the motor via the contactor if the temperature rises above 75°C (167°F). The temperature limit is factory-set and cannot be changed. Display: No light: Motor stopped. No supply voltage or electrical fault at temperature measuring. Green light: Motor in operation and motor temperature OK, i.e. below 75°C (167°F). Red light: Motor stopped and motor temperature too high, i.e. above 75°C (167°F). The MTP 75 is reset manually by pressing the reset button on the front cover or by switching off the voltage supply to the MTP 75. No unnecessary downtime Since the MTP 75 measures only the temperature and no other parameters causing a temperature rise, the motor and thus the pump will stop only when the motor temperature is too high. Reliability The MTP 75 is reliable due to its simple construction and because it requires no extra cables in the piping. Technical data of MTP 75 Supply voltage: Control voltage: Enclosure class: IP 20. Operating conditions: Storage: 2 variants: 1 x 200-240 V ±10%, 50/60 Hz. 3 x 380-415 V ±10%, 50/60 Hz. A transformer is required for voltages over 415 V. Contact load: Maximum 415 V/3 A. Minimum 12 V/20 mA. Min. temperature: –20°C (–4°F). Max. temperature: +60°C (+140°F). Relative humidity: 99%. Min. temperature: –20°C (–4°F). Max. temperature: +60°C (+140°F) Relative humidity: 99%. Approvals: Complying with the regulations of VDE and DEMKO. Product numbers MTP 75 without plug-in base, capacitor and signal transformer: Voltage range [V] GR 1915 Product number 1 x 200-240 00625178 3 x 380-415 00625179 MTP 75 complete with plug-in base, capacitor and signal transformer: Voltage range [V] 78 mm 35 mm 104 mm Product number 1 x 200-240 00625804 3 x 380-415 00625805 TM00 7874 1102 43
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Accessories - Grundfos

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