General information vacon • 7
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
1
Requirements for an external power back-up:
- output voltage +24DC±10%, max. ripple voltage 100mV RMS
-max. current 1A
- 1A external fuse (no internal short-circuit protection on the control board
NOTE: Analogue outputs and inputs do not work with only +24V supplied to the control unit.
If there is a +24V/EXT+24V output on the board it is short-circuit protected locally. If one of the +24V/
EXT+24V outputs short-circuits, the others remain powered because of the local protection.
1.4.5 Digital input signal conversion
The active signal level depends on which potential the common input CMA (and CMB if available) is
connected to. The alternatives are +24V or Ground (0V). See Figure 4, Figure 5 and Figure 6.
The 24-volt control voltage and the ground for the digital inputs and the common input (CMA) can
be either internal or external.
Some typical input signal conversion examples are shown below. If you use the internal +24V from
the AC drive, the following arrangements are possible:
Figure 4. If CMA is connected to GND with inboard jumper the internal +24V is used and the CMA terminal
ed not be wired
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