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System Ar chi tec ture
The OptiView Control Center performs the following
functions:
• Controls chiller capacity to chill liquid to the chilled
liq uid temperature setpoint.
• Controls chiller solenoid valves, relays, ac tu a tors
and motor contactors per the operating program.
• Displays chiller operating conditions, alarms, shut-
down messages and history data.
• Accepts operator-programmed setpoints and con-
trols the chiller accordingly.
• Allows manual control of chiller motor contactors
and actuators.
• Monitors chiller operating conditions and shuts
down chiller when Safety or Cycling thresh olds
are ex ceed ed.
• Allows local manual start/stop and accepts start/
stop commands from remote devices, via contact
clo sures or serial communications.
• Allows setpoints to be changed from a remote lo-
ca tion via 0-10VDC, 2-10VDC, 0-20mA, 4-20mA,
con tact clo sures or se ri al com mu ni ca tions.
• Provides chiller operating data and status to re mote
devices via serial communications and con tact
clo sures.
• Allows real-time data and history data to be print ed
on an optional printer.
• Controls the compressor motor starter and con tains
a printed circuit board logic that supports Electro-
Mechanical Starters, Solid State Starters and YORK
Vari able Speed Drive.
The OptiView Control Center is a microprocessor
based control system that receives analog, digital and
serial data in puts and controls analog, digital and serial
data outputs per instructions in the operating program.
A panel mount ed display and touch-sensitive keypad
per mit lo cal operation.
System pressures are sensed by pressure transducers
The out put of each transducer is a DC volt age that is
anal o gous to the pressure input. System tem per a tures are
sensed by thermistors. The out put of each ther mistor
is a DC voltage that is analogous to the tem per a ture it
is sens ing. Typical output voltage range of both is 0.5
to 4.5VDC. These are analog inputs to the OptiView
Con trol Cen ter.
10
SECTION 2
SYSTEM ARCHITECTURE
Digital Inputs are on/off inputs to the OptiView Con trol
Center in the form of switch and relay contacts. These
inputs are 115VAC when the contacts are closed and
0VAC when open. These include fl ow switches, local
start/stop switch, remote cycling and high pres sure
safe ty de vice, etc.
Digital Outputs are on/off outputs from the OptiView
Control Cen ter in the form of relay contacts and triacs.
The re lay con tacts typically switch 115VAC and the
triacs typ i cal ly switch a nominal 30VAC. Relay out puts
include status/alarm, chill er solenoid valves, oil heater,
oil pump starter and chilled and condenser wa ter pump
starters, etc. Triac outputs include pre-ro ta tion vane
control and vari able orifi ce control.
Serial Data is transmitted to and received from de vic es
in RS-232, RS-485 and TX/RX (opto-couple) form.
The OptiView Control Center supports three types of
starters; Electro-Mechanical Starter, Solid State Start er
and Vari able Speed Drive. However, all OptiView Con-
trol Centers con tain the following standard com po nents,
regardless of the starter type applied:
• Microboard
• I/O (input/output) Board
• Keypad
• Display
• Power Supply
In addition to the standard components, the OptiView
Control Center contains a printed circuit board that
pro vides certain control and interface functions for the
start er type applied. Each starter type requires a dif fer ent
board as follows:
• Electro-Mechanical Starter - CM-2 Current Mod-
ule
• Solid State Starter (Mod "A" only) - Logic Board
• Variable Speed Drive - Adaptive Capacity Con trol
Board
Figures 1 through 4 are OptiView Control Center block
diagrams of the three starter types. On each block di-
a gram, the stan dard components are shown, along with
the print ed cir cuit board that supports the applied start er
type. Fig ures 5 and 6 are Operation Sequence timing
diagrams of the different starter applications.
FORM 160.54-M1(503)
YORK INTERNATIONAL
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