Mitsubishi Electric PURY-EP200YLM-A, Руководство по обслуживанию

Страница: 149 / 434

[5-2 Outdoor Unit Control ]
- 138 -
HWE1314A GB
5-2-6 Frequency Control

Depending on the capacity required, the frequency of the compressor is controlled to keep constant evaporation temperature
(0°C [32°F] = 0.71 MPa [103 psi]) during cooling operation, and condensing temperature (49°C [120°F] = 2.88 MPa [418 psi])
during heating operation.

The table below summarizes the operating frequency ranges of the inverter compressor during normal operation.

The OS in the multiple-outdoor-unit system operates at the actual compressor frequency value that is calculated by the OS
based on the preliminary compressor frequency value that the OC determines.
The maximum frequency during heating operation depends on the outside air temperature and the dipswitch settings.
(1) Pressure limit
The upper limit of high pressure (63HS1) is preset, and when it exceeds the upper limit, the frequency is decreased every 15
seconds.

The actuation pressure is when the high-pressure reading on 63HS1 is 3.58MPa[519psi].
(2) Discharge temperature limit
Discharge temperature (TH4) of the compressor in operation is monitored, and when it exceeds the upper limit, the frequency
is decreased every minute.

Operating temperature is 115°C [239°F].
(3) Periodic frequency control
Frequency control other than the ones performed at start-up, upon status change, and for protection is called periodic frequen-
cy control (convergent control) and is performed in the following manner.
Periodic control cycle
Periodic control is performed after the following time has passed

30 seconds after either compressor start-up or the completion of defrost operation

30 seconds after frequency control based on discharge temperature or pressure limit
The amount of frequency change
The amount of frequency change is controlled to approximate the target value based on the evaporation temperature (Te) and
condensing temperature (Tc).
Model
Frequency/cooling Frequency/heating
Max Min Max Min
P200 52Hz 10Hz 58Hz 27Hz
P250 65Hz 10Hz 74Hz 27Hz
P300 74Hz 16Hz 92Hz 29Hz
P350 95Hz 16Hz 107Hz 29Hz
P400 97Hz 16Hz 107Hz 29Hz
P450 111Hz 16Hz 124Hz 29Hz
P500 120Hz 16Hz 129Hz 29Hz
EP200 52Hz 10Hz 58Hz 27Hz
EP250 65Hz 10Hz 74Hz 27Hz
EP300 74Hz 16Hz 92Hz 29Hz
EP350 95Hz 16Hz 107Hz 29Hz
EP400 97Hz 16Hz 107Hz 29Hz
EP450 111Hz 16Hz 124Hz 29Hz
EP500 120Hz 16Hz 129Hz 29Hz