VLT
®
6000 HVAC
64
MG.60.B1.02 - VLT is a registered Danfoss trade mark
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DC bus connection
The DC bus terminal is used for DC back-up, with the
intermediate circuit being supplied from an external
DC source. In addition, a 12-pulse option can be
connected to reduce the total harmonic distortion.
Terminal nos.
Contact Danfoss and ask for the Design Guide if you
require further information.
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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
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:
0.5 - 0.6 Nm.
Screw size:
M3.
No. 1
Nos. 88, 89
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Motor thermal protection
The electronic thermal relay in UL-approved VLT
frequency converters has received UL-approval for
single motor protection, as long as parameter 117
Motor thermal protection
has been set to ETR Trip
and parameter 105
Motor current, I
VLT,N
has been
programmed for the rated motor current (can be read
from the motor nameplate).
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Earth connection
Since the leakage currents to earth may be higher
than 3.5 mA, the VLT frequency converter must
always be earthed in accordance with applicable
national and local regulations. In order to ensure
good mechanical connection of the earth cable, its
cable cross-section must be at least 10 mm
2
. For
added security, an RCD (Residual Current Device)
may be installed. This ensures that the VLT frequency
converter will cut out if the leakage currents get too
high. See RCD instructions MI.66.AX.02.
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Control card
All terminals for the control cables are located under
the protective cover of the VLT frequency converter.
The protective cover (see drawing below) can be re-
moved by means of a pointed object - a screwdriver
or similar.
