FORM 150.24-NM27
YORK INTERNATIONAL
39
FIG. 12
POWER PANEL
SYS 1
CONTACTORS
SYS 2 CURRENT
TRANSFORMER
SYS 2
CONTACTORS
TB1 CONNECTIONS
FOR OPTIONAL
ALARMS,EVAP
PUMP,COND PUMP,
AND L& 2 115 VAC
CONTROL PANEL
SUPPLY
SYS 2
POWER WIRING
CONNECTION
POINT
SYS 1
POWER WIRING
CONNECTION
POINT
SYS 1 CURRENT
TRANSFORMER
TB2
1 FUSE
2 & 3
FUSE
26126A
Four system switches located on the Microprocessor Board
activate or deactivate the individual systems (compressors).
POWER SUPPLY BOARD
The on-board switching power supply converts 24VAC
from the 2T transformer to +12V REG which is supplied
to the Microprocessor Board, Relay Board, and 40 Char-
acter Display to operate integrated circuitry.
A rectifier and filtering circuit for each motor current cir-
cuit rectifies and filters these signals to variable DC.
These signals are then fed to the Microprocessor Board.
RELAY OUTPUT BOARD
This board converts 0-12VDC logic level outputs from
the Microprocessor Board to 120VAC levels used by
motor contactors, solenoid valves, etc. to control sys-
tem operation. The common side of all relays on the
Relay Output Board is converted to +12V REG.
The open collector outputs of the Microprocessor Board
energize the DC relays by pulling the other side of the
relay coil to ground. When not energized, both sides of
the relay coils will be at +12VDC potential.
I/O EXPANSION BOARD
Introduced in the latter part of 1997, the I/O Expansion
Board allows the Micro to receive additional analog in-
puts from Oil Temperature Sensors and optional Dis-
charge Temperature Sensors.
These inputs are multiplexed and sent to the micropro-
cessor board to allow the micro to monitor these inputs
for display and as safeties.
CURRENT TRANSFORMER (C.T.)
A C.T. on the 3
φ
power wiring of each motor sends AC
signals proportional to motor current to the Power Supply
Board which rectifies and filters the signal to variable DC
voltage (analog). This analog level is then fed to the Micro-
processor Board to allow it to monitor motor current.
40 CHARACTER DISPLAY
The 40 Character Display (2 lines of 20 characters) is a
liquid crystal display used for displaying system parameters
and operator messages. The display has a lighted back-
ground for night viewing as well as a special feature which
intensifies the display for viewing in direct sunlight.
KEYPAD
An operator keypad allows complete control of the sys-
tem from a central location. The keypad offers a multi-
tude of commands available to access displays, pro-
gram setpoints, and initiate system commands.
BATTERY BACK-UP
The Microprocessor Board contains a Real Time Clock
integrated circuit chip with an internal battery back-up.
The purpose of this battery back-up is to assure any
programmed values (setpoints, clock, cut-outs, etc.) are
not lost during a power failure regardless of the time in-
volved in a power outage or shutdown period.
Summary of Contents for YCRJ45E00
Page 29: ...FORM 150 24 NM27 YORK INTERNATIONAL 29 CONTROL CIRCUIT With I O Expansion Board LD02106 ...
Page 30: ...30 YORK INTERNATIONAL FIG 9 SYSTEM WIRING ...
Page 31: ...FORM 150 24 NM27 YORK INTERNATIONAL 31 LD02678 ...
Page 35: ...FORM 150 24 NM27 YORK INTERNATIONAL 35 LD02679 ...
Page 36: ...36 YORK INTERNATIONAL MICROPANEL CONNECTION DIAGRAM With I O Expansion Board LD02107 ...
Page 37: ...FORM 150 24 NM27 YORK INTERNATIONAL 37 LD02108 ...
