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ELECTRICAL CABLING AND CONNECTIONS
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6
6.2.3.1
Digital input signal inversions
The active signal level depends on which potential the common inputs CMA and CMB (terminals 11 and 17)
are connected to. The alternatives are 24V or ground (0 V). See Figure 6-13.
The 24-volt control voltage and the ground for the digital inputs and the common inputs (CMA, CMB) can be
either internal or external.
Figure 6-13. Positive/Negative logic
6.2.3.2
Jumper selections on the OPT-A1 basic board
The user is able to customise the functions of the frequency converter to better suit his needs by selecting
certain positions for the jumpers on the OPT-A1 board. The positions of the jumpers determine the signal
type of analogue and digital inputs.
On the A1 basic board, there are four jumper blocks X1, X2, X3 and X6 each containing eight pins and two
jumpers. The selectable positions of the jumpers are shown in Figure 6-15.
Figure 6-14. Jumper blocks on OPT-A1
+24V
+24V
DIN1
DIN2
DIN3
CMA
DIN1
DIN2
DIN3
CMA
nk6_16
Ground
Ground
Positive logic (+24V is the active signal) =
the input is active when the switch is closed
Negative logic (0V is the active signal) =
the input is active when the switch is closed.
Requires setting of jumper X3 to position
‘CMA/CMB isolated from ground’
