Mitsubishi 1993 3000GT, Technical Information Manual

Page: 210 / 216

Belt lock controller
COMPRESSOR CONTROL
If anyone of the following switches and sensors is turned
off, the magnet clutch of the compressor is turned off.
Switch and sensor Operating condition of compressor
Blower switch
Air conditioner switch
} Automatic when in AUTO
Dual-pressure switch
High pressure switchkPa (kg cm
2
, psi) OFF: 2,700 (27, 384) or more ON : 2,100 (21, 299) or less
Low pressure switch kPa (kg cm
2
, psi) OFF: 210 (2.1, 30) or less ON : 235 (23.5, 33) or more
Engine coolant temperature switch OFF at 115 ± 3ºC (239 ± 5ºF) or over,
ON at 108ºC (226°F) or less
Engine coolant temperature sensor OFF at 155 ± 5ºC (311 ± 9ºF) or over,
ON at 110ºC (230°F) or less
Air inlet sensor OFF when sensing temperature is lower than a set temperature,
ON when sensing temperature is higher than a set temperature
(ECONO mode only)
Air thermo sensor OFF at -2ºC (28.4ºF) or less, ON at 2
ºC
(35.6ºF) or over
Revolution pick-up sensor OFF when compressor slipping rate(s) is 70% or more
S= 1- Nc . x100 Ne: engine rpm
Ne x Pulley ratio Nc: compressor rpm
Control when Compressor Locks
Since the compressor and alternator are driven by the
same belt, the electric generating function of the
alternator also stops when the belt is broken. In order to
assure the electric generating function of the alternator,
there is a belt lock controller to prevent breaking of the
belt due to slipping when the compressor locks.
The controller makes a comparative calculation of the
compressor revolutions and the engine revolutions which
are detected by the revolution pick-up sensor. When
Air conditioning color monitor
Blinking
20F0026
7-38
ELECTRICAL -
Heater and Air Conditioning
Shower duct (R.H.)
Revolution pick-up sensor
Compressor
20N0071
70% or more slip ratio continues for 3 seconds or more,
the compressor relay goes from on to off; at the same
time, in models with full automatic air conditioners, the
mark in the air conditioner color monitor in the air
conditioner control panel blinks to announce (an
abnormality and, in models with manual air conditioners,
the operation display in the air conditioner switch blinks
to announce an abnormality.