Illustration 3.3
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 shown in Illustration 3.4
has to be established.
Illustration 3.4 Principle Diagram
3.1.3 Digital Inputs - Terminal X30/1-4
Parameters for set-up: 5-16, 5-17 and 5-18
Number of
digital inputs
Voltage level Voltage levels Tolerance Max. Input impedance
30-24 V DCPNP type:
Common = 0 V
Logic “0”: Input < 5 V DC
Logic “0”: Input > 10 V DC
NPN type:
Common = 24 V
Logic “0”: Input > 19 V DC
Logic “0”: Input < 14 V DC
±
28 V continuous
±
37 V in minimum 10 s
Approx. 5 k
Ω
Table 3.1
3.1.4 Analog Voltage Inputs - Terminal X30/10-12
Parameters for set-up: 6-3*, 6-4* and 16-76
Number of analog voltage inputs Standardized input signal Tolerance Resolution Max. Input impedance
20-10 V DC
±
20 V continuously
10 bits
Approx. 5 K
Ω
Table 3.2
Drive Selection
VLT
®
Refrigeration Drive Design Guide
MG16G102 - VLT
®
is a registered Danfoss trademark 37
3
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