Danfoss VLT 6000 Quick Setup Manual page 13

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 has been programmed for the
VLT,N
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 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
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.
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 if you require further
information.
12
VLT
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.
No. 1
Max. cross-section:
Torque:
Screw size:
Control card
All terminals for the control cables are located
2 . under the protective cover of the VLT frequency
converter.
The protective cover (see drawing below) can be
removed by means of a pointed object - a
screwdriver or similar.
Nos. 88, 89
MG.60.C4.02 – VLT is a registered Danfoss trademark
® 6000 HVAC
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.
2
4 mm /10 AWG.
0.5 - 0.6 Nm.
M3.