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present position. If TVC only is energized, the right side
of the turn valve actuator is exhausted to the compres-
sor inlet cavity, causing the turn valve to move towards
the full load position. If TVO only is energized, the left
end of the turn valve actuator is exhausted to the com-
pressor inlet cavity, causing the turn valve to move to-
wards the unload position. See “AUTO SENTRY
OP-
ERATION,” in this section for a description of how the
turn valve position is controlled during normal opera-
tion.
System Pressure Transducer – This transducer is
connected after the minimum pressure valve. It con-
verts the pressure in the plant air system into an electri-
cal signal for use by the “AUTO SENTRY
” controller
for modulation and control.
Reservoir Pressure Transducer – This transducer
is connected to the coolant system. Its signal is used
to prevent loaded starts, monitor reservoir pressure,
and monitor the condition of the air/oil separator.
Air Filter Vacuum Switch – This switch is used to
monitor air filter condition and alert the user if the filter
requires service or replacement.
Discharge Thermistor – This sensor is located di-
rectly in the compressor discharge. Its signal is used
to monitor compressor temperature and shut down the
compressor if a coolant problem is detected.
Reservoir Thermistor – This sensor is located near
the separator and is used to monitor temperature and
shut down the compressor if high temperatures are de-
tected.
Emergency Stop Push–Button – This is a main-
tained push–button, and removes power from the con-
troller outputs regardless of controller status. It is lo-
cated on the upper section of the panel, next to the
keypad. This should be used for emergency purposes
only – use the keypad [STOP/RESET] for normal con-
trolled stopping.
Automatic restarting or electrical
shock can cause injury or death.
Open, tag and lockout main discon-
nect and any other circuits before
servicing the unit.
Vibration Switch – The “AUTO SENTRY
” controller
has one additional input available for dealer or user
installed optional shutdown switches. The switch is
simply wired in place of the jumper between terminals
7 and 9 of the terminal strip. If the contact is opened,
the compressor will be shut down, and will display
“SHUTDOWN – HIGH VIBRATION”.
The vibration shutdown switch is to be mounted on the
compressor coupling cover, and detects an increase in
vibration that could be an indication of impending dam-
age to the unit. The switch actuates when the selected
level of vibration is exceeded.
The switch must be adjusted when the unit is first
installed. Refer to the switch manufacturer’s instruc-
tion manual for complete details.
Control Transformer – This control device changes
the incoming power voltage to 110–120 volts for use by
all unit control devices. The transformers employed
are usually connectable for several input voltages, re-
fer to the transformer label for connection prior to ener-
gizing. Two primary and one secondary fuse are pro-
vided. Refer to adjacent labeling for replacement
information.
FIGURE 4–7 – TURN VALVE ACTUATOR
Содержание ELECTRA-SAVER EAY
Страница 14: ...13 10 613 Page 6 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Страница 15: ...13 10 613 Page 7 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...
Страница 32: ...13 10 613 Page 24 FIGURE 4 8 CONTROL SCHEMATIC COMPRESSOR AT FULL LOAD 204EAY797 B Ref Drawing...
Страница 35: ...13 10 613 Page 27 FIGURE 4 11 WIRING DIAGRAM 202EAY546 Ref Drawing...
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