NFO
Drives
AB
2021
201013
‐
2
Operating
and
Installation
Manual
12
4.1.4 Negative
logic
The inverter can be configured to run the
digital inputs (DIN1 to DIN8) with negative
logic. This is done by moving jumper J801 to
the “NEG LOG” position. The inputs are then
made active by connecting them to the 0V
(terminals 11,12, 30 or 31), see Fig.4.
If the PTC function is to be used with
negative logic, an external resistor (1,5k
Ω
,
min 1/2W) must be connected between the
terminals DIN8 and 0V. And J802 must be in
the OFF position.
Fig.4. Connection via negative logic (jumper J801 moved)
4.1.5 Serial channel RS485
The inverter can be controlled via an RS485 type
serial channel. Connection is made through
terminals 32 (RS485.A) and 34 (RS485.B). If the
signals are to be bridged to further units, terminals
33 and 35 can be used as in Fig.5.
Termination of the serial channel with 124
Ω
resistor
is available by moving jumper J803 to position “485
TERM. ON”.
Fig.5. Connection RS485
4.1.6 Connecting
potentiometer
If a potentiometer is to be used as the setpoint
source, it is connected between the analogue
voltage output AOUT2.U (27) and the analogue
voltage input AIN1.P (11 or 12).
Change parameter
AinSet
to
Pot
and this
automatically configures AOUT2.U to supply 10V.
The value of the potentiometer should be between
4,7k
Ω
and 22k
Ω
. A lower value will give a lower
maximum frequency because of a 50
Ω
output
impedance in AOUT2.U.
Fig.6. Connecting potentiometer
3006469-2022-04
