Mitsubishi Electric e Series Service Handbook page 102

[ VII Control ]
-4- LEV in the main circuit
Operating range of the LEV
The opening range of the LEV is between 100 and 2000 (fully open).
LEV operation speed
100 pulse/sec
Open
Close 200 pulse/sec
At startup
During startup, the valve will be moved to the Initial Setting.
During operation
After startup, the LEV opening will be controlled every 20 seconds according to the changes in compressor frequency, pres-
sure, and temperature.
The LEV will be controlled to keep the suction SH in 3K.
If the low pressure reaches 1.45 MPa or above, the LEV opening will be controlled to keep the low pressure from rising too
high.
-5- LEV in the injection circuit
LEV operation range
The LEV operation range is between 32 and 480.
Open 30.77 pulses/sec
Close 30.77 pulses/sec
At startup
At the startup, the valve will be moved to the initial setting.
During operation
 After the startup, the LEV operation will be controlled every 30 seconds according to the change in the refrigerant discharge
temperature.
 The LEV will be controlled to keep the refrigerant discharge temperature constant.
Refrigerant Recovery Control
-6- Operation during power failure
Duration of power failure 20 ms or shorter
Detection of power failure
Operation during power failure
Operation Automatic restoration
after power is after power failure is set
restored to "Enabled" (SW6-9 is
set to ON.)
Automatic restoration
after power failure is set
to "Disabled" (SW6-9 is
set to OFF.)
HWE20010
20 ~ 200ms
Undetectable Instantaneous power
failure
Normal During an instanta-
operation neous power failure,
the unit will be con-
trolled according to
the input status of
the circuit board im-
mediately before the
instantaneous power
failure.
Normal The circuit board will
operation start receiving input.
- 93 -
200 ms or longer
Detection of power failure
All outputs will be turned off immedi-
ately after power failure.
The unit will be controlled according to
the input status of the circuit board im-
mediately before the power failure, ex-
cept that the input status of the No-
voltage contact after the power is re-
stored will override the one before the
power failure. For three minutes after
the power is restored, the unit will not
operate.
The unit will stop, displaying the error
code for power failure.
The error will be cleared when the op-
eration command signal is off.
GB