EVCO c-pro mega RACK - Manual (Page 73)

C-PRO MEGA RACK & C-PRO GIGA RACK APPLICATION MANUAL
Page 73
the zone, the on and off requests for the various steps must be timed. The relevant parameters are as
follows:
⋅
Minimum switch-on time (NZ_TOnMin)
⋅
Maximum switch-on time (NZ_TOnMax)
⋅
Minimum switch-off time (NZ_TOffMin)
⋅
Maximum switch-off time (NZ_TOffMax)
On the basis of the suction pressure value approaching the reference value, the times will vary
proportionally according to the values set. Depending on the circumstances, the reference value
mentioned represents the right and left limit of the neutral zone with the addition of a further
differential (settable by means of a parameter) within which will be the proportional variation for
the time in question.
At the regulation limits, the on and off time values are the maximum and minimum times set by the
parameter. To make the request time constant during switching on, simply set parameters
NZ_TOnMin and NZ_TOnMax to the same value. The same applies for switching off.
6.3.3 Side band regulation with inverter
This type of control introduces inverter control to normal side band control, and in order to do this it
is essential to set several parameters relating to the inverter device it is intended to use, in addition
to enabling its use. The parameters in question are the following:
⋅
Inverter differential (ID)
⋅
Inverter enabling
⋅
Inverter offset with respect to the suction setPoint (OFSI)
⋅
Minimum inverter value (MinI)
⋅
SpeedUp time
⋅
Side band suction SetPoint (SP)
The regulator output will assume different values depending on the value measured by the suction
probe.
If the value measured by the probe is less than or equal to the value of SP + OFSI, the regulator
output assumes the value 0.
If the value measured by the probe is between the value of SP + OFSI and the value of SP + OFSI +
ID, the regulator output will assume a value proportional to the suction probe value.
In the case where the suction probe assumes a value greater than or equal to the value of SP + OFSI
+ ID, the inverter output will assume the maximum value.
In the case where the parameter MinI has been set, then with each switching on, the inverter will
maintain that value as the starting value.
Where the speedUp time parameter is greater than zero, with each startup, the inverter will assume
the maximum value for the number of seconds set by this parameter.
SP + OFSI SP + OFSI + DI
Pressure
Inverter
MinI
100.00 %