NFO
Drives
AB
2021
201013
‐
2
Operating
and
Installation
Manual
47
Set the regulator amplification using parameter RegKp in parameter group PI-reg.
Set regulator integration time using parameter RegTi in parameter group PI-reg.
Start system by connecting terminal 1 (DIN1, Run signal)) to terminal 9 (+24V). If you are not in Auto mode
press [MAN/AUTO]
Stop motor by disconnecting terminal 1 and terminal 9.
9.3.6 Alternating fixed frequency and process regulation
Once a process regulation configuration has been set up and trimmed using the Control Mode PI-reg, it’s possible
to use a combination of process regulation and a setpoint frequency, using an external time relay connected to
DIN4. This could for example be used for controlling ventilation during daytime with process regulator (i.e. fan
speed is controlled for producing a certain pressure), and during night time the fan operates at another (low)
frequency.
Set up and trim the regulator using
Control Mode
PI-reg
.
Set
parameter
Control Mode
in parameter group
Control
to
Frequency
.
Connect an analog control signal to terminal 20 (AIN1.P, positive) and terminal 21 (AIN1.N, negative) that gives
the desired night time (low frequency) setting.
Connect a time relay or other contact between DIN4 (PI-reg) and a +24V source. When DIN4 terminal is active,
the PI-reg is activated. When DIN4 is not active, the inverter selects the night time setup frequency.
9.3.7 Ventilation control with analog setpoint and fire alarm
For ventilation installations, it is sometimes necessary to let an external signal or alarm contact override the control
setpoint, e.g. in a case of fire alarm the fan should speed up to pre-defined or maximum ventilation. Example sets
up for normal conditions 10 – 40 Hz using analog input 0 – 10 V as setpoint, and changes to 50Hz if alarm occurs.
Connect analog control signal to terminal 20 (AIN1.P, positive) and terminal 21 (AIN1.N, negative).
Connect fire alarm indication signal to DIN5 (Select A / Fix 1).
Set
parameter
Ain 1 Type
in parameter group
Control
to
0-10 V
.
Set
parameter
Op Mode (Setp Source)
in parameter group
Frequency
to
Terminal
.
Set
parameter
Fix Frq 1
in parameter group
Frequency
to 50Hz.
Set
parameter
Freq Min
in parameter group
Frequency
to 10Hz.
Set
parameter
Freq Max
in parameter group
Frequency
to 40Hz.
Start motor by connecting terminal 1 (DIN1, Run signal)) to terminal 9 (+24V).
3006469-2022-04
