Power Cartridge (Input/Output)
I
Mother Board
Oil Pump
Contactor
\
Field
Connection
Terminal
Strip
/
//
f
Daughter Board
TR-3 (Top)
-
/
TR-2
-.
\
-
Surgeguard
Guardistor
Relays
-
Mechanical
High Press. (Left)
and Low Press.
cutouts
-
Display
EnGinn
T&l
Transformers
AC
to DC volts
Signal Converter
-
Solid-state
Output Relays
and Mounting Board
The control panel contains the following components:
0 16 lighted and fused optically isolated output contact ter-
minals for pre-assigned logic control functions.
See the Control Legend or the wiring schematic for specific
terminal identification.
0 14 analog and 12 digital information inputs. The monitored
data includes water and refrigerant temperatures, motor
amperage, oil pressure and oil temperature.
0 Digital contact closures prove the existence or operation
of ancillary functions required for the safe operation of the
controlled chiller.
(For a complete list of inputs, see the table provided or the
wiring schematic).
0 Microprocessor Control EnGinn parts consisting of durable
aluminum encased logic and power (l/O) cartridges secure-
ly clamped to the controller mother board.
0 A daughter board to collect and condition digital and
analog input signals, and deliver the needed voltage levels
to the microprocessor.
0 An
aluminum
encased 20 character microprocessor
display EnGinn.
0 A printed circuit AC to DC signal converter. (Optional).
0
Three 115 volt to 24 and 12 volt control power transformers.
0 Compressor Surgegard and motor Guardistor protective
relays and capacitors.
l Mechanical/Electrical low pressure (MLP) and high
pressure (MHP) refrigerant protective controls.
0 A Safety fault Trip Relay (FT).
l Oil pump contactor with auxiliary interlocks
0 Communication ports.
0 An internal 115 volt, 3 amp manual reset circuit breaker.
0 An electrically grounded, touch sensitive keyboard
mounted on the cover panel.
0 A cover panel mounted “Stop-Auto” switch.
0 Cover panel mounted indicating lights for indicating the
status of the microprocessor control and compressor
loading
or
unloading.
Page 4
I
IM 403
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