Operation Limits - mycom SCV Series Instruction Manual

2.3.2

Operation Limits

Table 2-6 Operation Limits of SCV-series Screw Compressors
I t e m
Maximum discharge pressure
Maximum suction pressure
Minimum suction pressure
Minimum differential pressure
between discharge pressure and
suction pressure
Maximum oil supply pressure
Minimum oil supply pressure
Maximum suction temperature
Minimum suction temperature
Maximum discharge temperature
Maximum oil supply temperature
Minimum oil supply temperature
Maximum M rotor rotation speed
Minimum M rotor rotation speed
Note 1: Unless otherwise noted, the pressure unit MPa represents the gauge pressure in this manual.
Note 2: The oil supply pressure of the capacity control part (control hydraulic pressure of the unloader
slide valve), the value of the forced oil supply pressure is applied.
Note 3: When it is required that pressure difference between Pd (discharge pressure) and Ps (suction
pressure) should be not greater than 0.49 MPa, oil pump needs to be installed.
If a combination of "NH
lubricating oil, oil pump must be installed.
 If operation at partial load, which is not greater than 30 % of the indicated load, is
continued for a long time except when starting up the machine, abnormal noises
or vibration may be generated. So avoid such operation.
 Repeated startup and stop in a short period is harmful not for the startup devices
and electric machinery but also for the compressor itself. For information on the
start/stop limitations, refer to each instruction manual. Wait at least 15 minutes
after stopping the compressor before restarting it.
SCV-series Screw Compressors
Chapter 2 Compressor Specifications and Structure
MPa
MPa
MPa
MPa
Forced oil supply
MPa
Pd + 0.39
Forced oil supply
MPa
Pd + 0.049
°C
°C
°C
°C
°C
-1
min 4500 (250VLL and 320V*D are 3600)
min -1
+ compatible oil (PN46)" is used for working fluid (refrigerant) and
3
2-6
2205Q2JE-HO-S6-N_2020.01.
O p e r a t i o n L i m i t
1.96 (250VLL* is 1.37)
0.59
-0.080
0.49
Differential pressure oil supply
Pd
（＝Discharge pressure）
Differential pressure oil supply
Pd - 0.049
85
-60
90
60
30
1450
2.3 Compressor Specifications