Startup Control
SiAF341904E
82
Part 4 Functions and Control
4. Startup Control
Before starting the compressor:
The capacitor is charged in the DC circuit of the inverter circuit, and
“Pre-pressure equalization” is performed to reducing the starting current of the compressor.
Pc: High pressure sensor detection value
Pe: Low pressure sensor detection value
Ta: Outdoor air temperature
Te: Low pressure equivalent saturation temperature
4.1 Cooling Startup Control
120 seconds
Approx. 550 V
Step 4
ON
ON
OFF
OFF
OFF
0 V
Thermostat
signal
DC circuit
capacitors
Fan motor(s)
M1F: RXQ6-12A
M1F + M2F: RXQ14-20A
Solenoid valve
oil return
0 Hz
0 Hz
Step4
Te < 10˚C
Te < Th2(
∗
) – 10
&
Ta < 20˚C: OFF
Ta
≥
20˚C: Step4
0 pulse
Frequency step up
5 sec. interval
+1step/15 sec. (Pc > 2.16 MPa)
–1step/15 sec. (Pc < 1.77 MPa)
Inverter compressor 1
(M1C)
Inverter compressor 2
(M2C)
Electronic expansion
valve (Injection)
(Y2E)
Inverter fan
M1F: RXQ6-12A
M1F + M2F: RXQ14-20A
∗
RXQ16-20A only
Pc – Pe > 0.21 MPa
∗
Th2 in "Pre-pressure
equalization"
