
60 • vacon INSTALLATION INSTRUCTIONS
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250VAC/8A
125VDC/0.4A
Min.switching load 5V/10mA
250VAC/8A
125VDC/0.4A
Min.switching load 5V/10mA
Table 8-4. Control I/O terminal signals on basic relay board OPT-A2
250VAC/8A
125VDC/0.4A
Min.switching load 5V/10mA
250VAC/8A
125VDC/0.4A
Min.switching load 5V/10mA
Thermistor input
Table 8-5. Control I/O terminal signals on basic relay board OPT-A3
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 either +24V or ground (0 V). See Figure 8-7.
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 8-7. Positive/Negative logic
+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’
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