Galvanic Isolation In The Mcb - Danfoss VLT AutomationDrive FC 300 Design Manual

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9.3.1 Galvanic Isolation in the MCB 101

Digital/analog inputs are galvanically isolated from other
inputs/outputs on the MCB 101 and in the control card of
the frequency converter. Digital/analog outputs in the MCB
101 are galvanically isolated from other inputs/outputs on
the MCB 101, but not from these on the control card of
the frequency converter.
If the digital inputs 7, 8 or 9 are to be switched by use of
the internal 24 V power supply (terminal 9) the connection
between terminal 1 and 5 which is illustrated in
Illustration 9.11 has to be established.
Control card (FC 100/200/300)
General Purpose
I/O option MCB 101
DIG IN
9 9
1 2
X30/
PLC
(PNP)
0V
PLC
(NPN)
24V DC
Illustration 9.11 Principle Diagram
Digital input - terminal X30/1-4
Number of digital inputs
Terminal number
Logic
Voltage level
Voltage level, logic'0' PNP (GND = 0 V)
Voltage level, logic'1' PNP (GND = 0 V)
Voltage level, logic '0' NPN (GND = 24 V)
Voltage level, logic '1' NPN (GND = 24 V)
Maximum voltage on input
Pulse frequency range
162
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VLT
CPU
0V 24V
CPU
0V 24V
DIG &
ANALOG
ANALOG
IN
RIN=
OUT
5kohm
3 4 5 6 7 8 9 10
0-10
VDC
24V DC
0V
MG33BE02 - VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
RIN=
10kohm
11 12
0-10
VDC
®
is a registered Danfoss trademark
3
X30.2, X30.3, X30.4
PNP or NPN
0-24 V DC
< 5 V DC
> 10 V DC
< 14 V DC
> 19 V DC
28 V continous
0-110 kHz