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VLT® 4000 VT
parameter setting) without connection to mains.
Please note that a warning of low voltage will be
given when 24 V DC has been connected; however,
there will be no tripping. If 24 V external DC supply
is connected or switched on at the same time as
the mains supply, a time of min. 200 msec. must
be set in parameter 111,
Start delay
.
A pre-fuse of min. 6 Amp, slow-blow, can be
fitted to protect the external 24 V DC supply.
The power consumption is 15-50 W, depending
on the load on the control card.
NOTE
Use 24 V DC supply of type PELV to ensure
correct galvanic isolation (type PELV) on
the control terminals of the VLT AFD.
■
DC bus connection
The DC bus terminal is used for DC back-up,
with the intermediate circuit being supplied
from an external DC source.
Terminal nos.
Nos. 88, 89
Contact Danfoss if you require further information.
■
High-voltage relay
The cable for the high-voltage relay must be connected
to terminals 01, 02, 03. The high-voltage relay is
programmed in parameter 323,
Relay 1, output
.
Relay output 1
No. 1
1+3 break, 1+2 make.
Max. 240 V AC, 2 Amp.
Min. 24 V DC, 10 mA or
24 V AC, 100 mA.
Max. cross-section:
4 mm
2
/10 AWG.
Torque:
4.5 - 5 ln lb.
Screw size:
M3
■
Control card
All terminals for the control cables are located under
the protective cover of the VLT AFD.
The protective cover (see drawing below) can
be removed by means of a pointed object -
a screwdriver or similar.
■
Electrical installation, control cables
Torque:
4.5 - 5 ln lb
Screw size:
M3.
Generally speaking, control cables must be shielded/
armored and the shield must be connected by
means of a cable clamp at both ends to the metal
cabinet of the unit (see
Grounding of shielded
(armoured control cables)
.
Normally, the shield must also be connected to the
body of the controlling unit (follow the instructions for
installation given for the unit in question).
If very long control cables are used, 50/60 Hz
ground loops may occur that will disturb the
whole system. This problem can be solved by
MG.40.A4.22 - VLT is a registered Danfoss trademark
48