INSTALLATION INSTRUCTIONS
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8
8.2.2.1
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 24 V or ground (0 V). See Figure 37.
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 37. Positive/Negative logic
8.2.2.2
Jumper selections on the OPTA1 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 OPTA1 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 39.
Figure 38. Jumper blocks on OPTA1
+24V
+24V
DIN1
DIN2
DIN3
CMA
DIN1
DIN2
DIN3
CMA
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’
11519_uk
11520_00
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