23
/04.2016/
G35
EN
μPC electronic board
It is installed on all AS, GS, GES units. This electronic board is connected to the C7000 via RS485 line to exchange
data. The μPC controls the compressor speed acting on the EC driver. It receives also signals from pressure trans-
ducers and NTC temperature probes to check whether compressor works within the admitted range and to control
the electronic expansion valve according to the superheating temperature.
On all units, this controller is also an expansion board of C7000 to provide the system with additional I/O contacts.
Compressor EC driver (AS, GS, GES units)
According to a signal from the μPC controller, it modulates the rotation speed of compressor, in order to adjust cooling
capacity to the actual thermal load.
Main switch
An all-phase main switch is placed on the cover of e-box and disconnects the main power supply of all unit electric
circuits downstream. The main switch knob is interlocked with the cover of e-box so as to prevent contact with elec-
tric live components inside the e-box. According to the instructions in chapter 6, an additional disconnecting switch
must always be installed on main power supply lines upstream the unit, in order to cut off the power supply before
performing maintenance.
Double power supply line is available as an option, with the possibility of connecting also a second
emergency power supply. In this case, the main switch installed on the unit interrupts both power
supply lines.
Main switch
Inverter (compressor EC
driver)
