VLT
®
6000 HVAC
■ Motor thermal protection
The electronic thermal relay in UL-approved 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).
■ Earth connection
Since the leakage currents to earth may be higher
than 3.5 mA, the frequency converter must always
be earthed in accordance with applicable na-tional
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 frequency converter
will cut out if the leakage currents get too high.
See RCD instructions MI.66.AX.02.
■ 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. 88, 89
Contac
t 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
prog
rammed in parameter 323, Relay 1, output.
No.
1
Rel
ay ouput 1
1+3 b
reak, 1+2 make
Max 24
0 V AC, 2 Amp
Min. 24
VDC10mAor
24 V AC, 1
00 mA
Max Cross-
section:
4mm
2
/10 AW
G
Torque: 0.5-0.6 Nm
Screw size: M3
■ Control card
All terminals for the control cables are located under
the protective cover of the frequency converter. The
protective cover (see drawing below) can be removed
by means of a pointed object - a screwdriver or similar.
MG.60.C7.02 - VLT is a registered Danfoss trademark
14
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