Revision 1 – 04.12.2015 25/28
INVERTER OPERATION
INVERTER CONTROLLED VIA ANALOG OUTPUT 4/20mA
In case output 4/20mA is activated, parameter C18, the display visualizes the symbol .
It is visualized below pressure or temperature area according parameter C18 is set 1 (regulation on working pressure) or 2
(regulation air end temperature).
Output 4/20mA ha sto be connected to the speed analog reference on the inverter.
In case of inverter air end motor, C18=1, the starting procedure change for the reason the sequence start/delta is not in:
relay RL2 is activated directl (and function air end motor activated), wait for time Wt3 (load time) and then RL4 is activated
(load solenoid valve). Activation steps for star and star/delta are by passed.
In this configuration RL3 is always de-energized.
Inverter run command can be got from the output PNP1.
In case you need to give to the inverter a digital input to force a pre-fixed frequency while the compressori s running
unload, you can use the output PNP2.
For run command you can use also relay outputs RL2,RL5, RL6 or RL7, eventually through external relays. These outputs
have to be set through the parameters C13, C14, C15 and C16 (value 5 in case of C18=1 and value 1 in case of C18=2).
Make reference to the PID operating drawing reported in the menu of the programming (see ANALOG OUTPUT) for the
calculation made by the controller.
INVERTER CONTROLLED VIA RS485
Through RS485 MODBUS interface the controller starts and stops the inverter.
When the compressor is loading the inverter PID is enabled: pressure setpoint and feedback come through MODBUS.
When the compressor is running unload the controller forces a constant frequency equal to the minimum frequency of the
range provided for the motor.
The controller can reset possible failures or alarms from the inverter through MODBUS interface.
The controller provides the user with some working data from inverter as frequency, power, current, voltage and IGBT
temperature and in case of failure or warnings the alarm/fault message and code.
For the operation functions the controller read also the working frequency range from the inverter.
Even in this case the start motor cycle bypass start and star/delta steps.
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