38
Accessories
MS Motors
Technical data
Enclosure class: IP 20.
Ambient temp.: –20°C to +60°C.
Relative humidity: 99%.
Voltage variation: –25/+15% of nominal voltage.
Frequency: 45 Hz to 65 Hz.
Max. back-up fuse: 10 A.
Relay output: Max. 415 V, 3 A, AC 1.
Approvals: The CU 3 complies with: VDE,
DEMKO, EN, UL and CSA.
Marking: CE.
Benefits of CU 3/R100
CU 3 is suitable for all 3-phase submersible motors.
Parameters monitored by
CU 3
Description
These components need not be
installed
Temperature
The actual motor temperature is measured by means of the Pt100.
The value measured is transferred via a separate cable to a relay.
Motor current The motor is stopped when the rated motor current set is exceeded. Motor starter/protective relay
Overvoltage/undervoltage If the actual value is higher/lower than the value set, the motor is stopped. Line monitor
Dry running
The motor power input is measured on each of the three phases and registered as
an average of these three values.
If the average value is lower than the value set, the motor is stopped.
Level relay 3 electrodes,
electrode cable
Phase asymmetry/direction of
rotation
The motor power input is measured on each of the three phases.
If the input phase sequence is changed, a fault indication is given.
Phase monitoring
Energy consumption in kW/h
The power is read and accumulated every 10 seconds.
The energy consumption is calculated and accumulated every 2 hours.
Counter (not calibrated)
Operating hours
Running when the motor relay is activated.
Stopped when the motor is not running.
Operating-hours counter
Starting delay Programmable. Time-delay relay
Restarting delay Programmable limit of starts/stops. Time-delay relay
Star-delta starting Corresponding to a star-delta time-delay relay. Time-delay relay
MS.book Page 38 Wednesday, January 26, 2005 3:25 PM
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