Electrical connection
en
Installation and operating instructions Wilo DD-I
105
4.4.2
Digital Data Interface power sup-
ply connection
Connect the Digital Data Interface power supply to the on-site switching system:
ƒ
Operating voltage: 24 VDC (12-30 V FELV, max. 4.5 W)
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Wire 1: +
ƒ
Wire 2: -
4.4.3
Connecting PTC sensors to the
motor winding
Pt100 or Pt1000 sensors installed in the motor winding are used for thermal motor
monitoring as part of software. View and adjust current temperature values and config-
ure limit temperatures with the user interface. PTC sensors installed in the hardware
define the maximum winding temperature and switch off the motor in an emergency.
CAUTION! Perform a functional check! Check the resistance prior to connecting the
PTC sensor.
Use an ohmmeter to measure the temperature sensor's resistance. PTC
sensors have a cold resistance between 60 and 300 ohm.
Connecting the PTC sensor to the on-site switching system:
ƒ
Operating voltage: 2.5 to 7.5 VDC
ƒ
Wires: 3 and 4
ƒ
Evaluation relay for PTC sensor, e.g. for enhancing the "MCB 112" Wilo-EFC PTC
thermistor board or "CM-MSS" relay
DANGER
Risk of explosion due to incorrect connection!
There is a risk of fatal injury within potentially explosive atmosphere if thermal mo-
tor monitoring has been connected incorrectly! The connection must always be car-
ried out by a qualified electrician. If used in potentially explosive atmospheres:
• Connect thermal motor monitoring via an evaluation relay!
• Deactivation by the temperature limiter must be conducted with reactivation
lock! It must only be possible to restart the unit once the unlock key has been
actuated by hand!
4.4.4
Network connection
Prepare the network control cable and install the enclosed RJ45 plug. Connect to a net-
work socket.
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