EVCO c-pro mega RACK - Manual (Page 76)

C-PRO MEGA RACK & C-PRO GIGA RACK APPLICATION MANUAL
Page 76
digital inputs and digital outputs for switching on/off and any increment devices, may be associated
with each compressor.
The compressors are managed by means of a setPoint and differential that can be set by means of a
parameter, and by reading a pressure value from the suction probe. Switching on/off is guaranteed
by a thermoregulation device and by certain times settings, protecting the various startup
operations.
6.4.1 Compressors per circuit
Depending on machine type, there are precise configurations relating to the compressors to be used
for each circuit.
Single-circuit
All 12 (8 if using C-PRO MEGA) compressors can be used without limitations. Indeed the circuit is
unique.
Dual-circuit and triple-circuit
The sum of the compressors used in the two/three circuits, including the inverters, must not exceed
12 (8 if using C-PRO MEGA); which is the maximum number of compressors managed by the
program.
The digital outputs and inputs assigned to the compressors and the corresponding operation alarms
are correctly assigned on the basis of the above guidelines.
Please note. By enabling the inverter for compressor regulation, the FIRST compressor (for each
circuit) will be the one controlled by the inverter, while any other additional compressors will be
hermetic in nature (without increment functionality) and will be controlled by digital outputs using
relays.
6.4.2 Compressor status
Each compressor has an associated compressor state, which identifies its relative status during
system operation.
A compressor can assume 7 different states:
Disabled: the compressor has not been configured for the system. In this state, the user interface
displays the symbol “ - ”.
1.
Off: the compressor is off. In this state, the user interface displays the message “OFF”.
2. Awaiting switch off: the compressor is about to be switched off, and is currently waiting
protective device waiting times. In this state, the user interface flashes the message
“WOFF”.
3. On: the compressor is on. In this state, the user interface displays the message “ON”.
4. Awaiting switch on: the compressor is about to be switched on, and is currently waiting
protective device waiting times. In this state, the user interface flashes the message “WON”.