EVCO c-pro nano RACK - Manual (Page 51)

C-PRO NANO RACK E C-PRO MICRO RACK APPLICATION MANUAL
Page 51
The use of this adjustment on the principal compressor is not linked to the adjustment of the other compressors,
since the two functions are independent from each other.
6.3.4 Neutral zone adjustment with inverter
This check adds an inverter type adjustment to a normal neutral zone adjustment; in order to do this, it is
necessary to set some parameters relative to the inverter device that will be used, besides enabling its use.
The parameters relative to the first circuit are the following:
- SPC1 = Setpoint compressors (SP)
- PC14 = Type of adjustment = 1
- PG12 = Activation inverter
- PC26 = Minimum value of inverter (MinI)
- PC27 = SpeedUp Time
- PC28 = Time or ramp of inverter (TI)
The adjustment varies according to the zone (neutral, turn-on or shutdown) in which the regulator is found.
In the neutral zone, the inverter is not subjected to any variation and no compressors are turned on or off.
In the turn-on zone:
- as soon as it is required, the inverter is activated.
- the value of the inverter changes according to the time TI set by the parameter. This represents the time
needed by the ramp of the inverter to go from the minimum value to the maximum value.
- when the inverter reaches the required maximum value, another step is required of the compressors.
- once the request is accomplished the value of the inverter is restored to the minimum value (MinI if
different from zero)
- If the turn-on zone remains, the cycle restarts.
If the turn-on request remains, all the compressors are turned on one by one, and at the end, the value of the
inverter is brought to the maximum value.
In the shutdown zone:
- as soon as it is required, the output of the inverter is brought to the minimum value, according to the TI.
- when the inverter reaches the minimum value, the compressors are required to shut down another step.
- once the request for a shutdown is completed, if the shutdown zone remains, the value of the inverter is
restored to the maximum value and the cycle restarts.
SP SP + BP
Steps
Max steps
Pressure
Pressure
SP + OFSI SP + OFSI + DI
Inverter
MinI
100.00 %
SP SP + BP
Steps
Max steps
Pressure
Example: 4 compressors without inverter Example: 4 compressors with 1 inverter