Safety
vacon • 9
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
1
1.6
Insulation system
A distinction has to be made for the following three groups of terminals, according to the insulation
system of VACON
®
20 X:
•
Mains and motor connections (L1, L2, L3, U, V, W) or (L, N, U, V, W)
•
Relays (R01, R02)
(**)
•
Control terminals (I/Os, RS485, STO)
The Control terminals (I/Os, RS485, STO) are isolated from the Mains (the insulation is reinforced,
according to IEC 61800-5-1) and
the GND terminals are referred to PE
.
This is important when you need to connect other circuits to the drive and test the complete assem-
bly. Should you have any doubts or questions, please contact your local VACON
®
distributor.
Figure 3. Insulation system (three-phase version).
Please, consider carefully the insulation system depicted in Figure 2, before con-
necting any circuit to the unit.
The control unit of VACON
®
20 X fulfils the insulation requirements of the stan-
dard IEC 61800-5-1 regarding DVC A circuits and also the strongest insulation
requirements of IEC 60950-1 regarding SELV circuits.
POWER UNIT
L1
L2
L3
U
V
W
R01 __
R02 __
10Vref __
Analog Inputs __
Digital Inputs__
Analog Output __
24V __
RS485 __
STO __
Keypad
CONTROL UNIT
Reinforced
Mains
DVC A
DVC A or Mains
(**)
DC-
(*)
DC+/R+
R-