Vacon 20 CP, Installation, Technical And Maintenance Manual

Page: 12 / 112

1
vacon • 9 Safety
1.7 Insulation system
A distinction has to be made for the following three groups of terminals, according to the insu-
lation system of VACON
®
20 CP:
• 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 rein-
forced, 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
assembly. Should you have any doubts or questions, please contact your local Vacon distribu-
tor.
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 CP 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-