DMS Manual
Electrical
connections
■
Motor thermistors
If the motor is fitted with thermistors these may
be connected directly to the DMS. To connect the
thermistors, first remove the shorting link, and then
connect the thermistors between terminals 31A & 31B.
Use double-isolated thermistors to
retain PELV.
■
Serial communication
The DMS can be equipped with either AS-i or
Profibus communication capabilities.
The AS-i and Profibus interfaces are optional.
The AS-i Fieldbus is connected at terminals 125 & 126.
The details of the Profibus connectivity are given
at the end of the manual.
NB!:
Communications and control cabling should
not be located within 300mm of power
cabling. Where this cannot be avoided
consideration should be given to providing magnetic
shielding to reduce induced common mode voltages,
for example, by laying the communication and
control cables in a separate conduit.
■
Earthing
Ensure that the DMS unit is earthed
properly. Use the chassis earth studs
provided for the purpose (4 of size M4).
For type T73 units, an external earth plug
(size M8) is provided to facilitate earthing.
To retain the IP rating of DMS, remember
to close all the unutilized cable entries
using the gland plugs (bungs) provided
loose with the DMS unit. In units with external plugs,
all plugs must be correctly mounted.
■
High voltage warning
The voltage of the DMS is dangerous
whenever the equipment is connected to
the mains. Ensure the DMS is correctly
connected and that all safety measures have been
taken before switching on the supply.
■
Galvanic isolation (PELV)
All control terminals, and terminals for serial
communication are safely isolated from
the mains potential, i.e. they comply with
the PELV requirements of EN/ IEC 60947-1. PELV
isolation of the control card is guaranteed provided
there is max. 300 VAC between phase and earth.
MG.05.A2.02 - VLT is a registered Danfoss trademark
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