37
MS Motors
Accessories
CU 3
The CU 3 control unit is an electronic motor starter for
monitoring and protecting installations with rated volt-
ages of 200-575 V, 50 - 60 Hz, and a maximum power
consumption of 400 A.
The CU 3 monitors the following parameters:
• System insulation resistance to earth before start.
• Motor temperature.
• Motor current consumption and current unbalance.
• Voltage supply.
• Phase sequence.
The CU 3 protects against:
• Dry running (not for certain MS 402 motors).
• Incipient motor defect
• Too high motor temperature (not for certain MS 402
motors).
• Motor burnout.
As standard, the CU 3 incorporates:
• Time relay for star-delta starting and autotrans-
former starting.
• Relay output for external fault indication.
In addition CU 3 can be expanded to offer the following
functions:
• Remote control R100: Wireless infra-red remote
control by means of the R100. This function enables
the user to change factory settings and to monitor
the installation by calling up actual operating data,
e.g. current consumption, supply voltage and oper-
ating hours.
• External sensors SM 100: Reception of data from
external sensors by means of an SM 100 sensor
module and control according to the data received,
e.g. flow rate, pressure, water level and conductiv-
ity.
• Communication module: Monitoring and commu-
nication via a data BUS (GENIbus), a modem or ra-
dio, e.g. PC-based control/monitoring.
Fig. 10
Fig. 11
Fig. 12
Fig. 13
GR0244 - GR1911TM00 7308 1102TM01 4020 1102TM00 7866 1096
CU 3
R100
200 mm
192.5 mm
54.5 mm
CU 3
200 mm
192.5 mm
54.5 mm
SM 100
50 mm
89 mm
106 mm
100 mm
330 mm
50 mm
Single-turn transformers, 100-400 A.
No monitoring of motor temperature.
Signal converter, 1-20 A/20-120 A, with
monitoring of motor temperature.
MS.book Page 37 Wednesday, January 26, 2005 3:25 PM
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