
VLT
®
6000 HVAC Series
■
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.
■
Installation of 24 Volt external DC supply
Torque: 0.5 - 0.6 Nm
Screw size:
M3
No.
Function
35(-), 36 (+)
24 V External DC supply
(Available with VLT 6152-6602 380-460 V and VLT 6102-6652,
525-600 V only)
24 V external DC supply can be used as low-voltage
supply to the control card and any option cards
installed. This enables full operation of the LCP (incl.
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.
NB!:
Use 24 V DC supply of type PELV to ensure
correct galvanic isolation (type PELV) on the
control terminals of the frequency converter.
■
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
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, out-put.
No. 1
Relay ouput 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
■
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.61.A5.02 - VLT is a registered Danfoss trademark
66