17
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
2
SECTION 2 - SYSTEM ARCHITECTURE
The OptiView Control Center performs the following
functions:
• Controls chiller capacity to chill liquid to the
Chilled Liquid Temperature setpoint.
• Controls chiller solenoid valves, relays, actuators
and motor contactors per the operating program.
• Displays chiller operating conditions, alarms,
shutdown 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 thresholds
are exceeded.
• Allows local manual start/stop and accepts start/
stop commands from remote devices, via contact
closures or serial communications.
• Allows setpoints to be changed from a remote loca-
tion via 0 to 10 VDC, 2 to 10 VDC, 0 to 20mA, 4 to
20mA, contact closures or serial communications.
• Provides chiller operating data and status to re-
mote devices via serial communications and con-
tact closures.
• 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
Electromechanical Starters, Solid State Starters
and YORK Variable Speed Drives.
The OptiView Control Center is a microprocessor
based control system that receives analog, digital and
serial data inputs and controls analog, digital and serial
data outputs per instructions in the operating program.
A panel mounted display and touch-sensitive keypad
permit local operation.
System pressures are sensed by pressure transducers.
The output of each transducer is a DC voltage that is
analogous to the pressure input. System temperatures
are sensed by thermistors. The output of each thermis-
tor is a DC voltage that is analogous to the temperature
it is sensing. Typical output voltage range of both is 0.5
to 4.5 VDC. These are Analog Inputs to the OptiView
Control Center.
Digital inputs
are ON/OFF inputs to the OptiView
Control Center in the form of switch and relay contacts.
These inputs are 115 VAC when the contacts are closed
and 0 VAC when open. These include flow switches,
local start/stop switch, remote cycling and high pres-
sure safety device, etc.
Digital Outputs
are ON/OFF outputs from the OptiV-
iew Control Center in the form of relay contacts and
triacs. The relay contacts typically switch 115 VAC and
the triacs typically switch a nominal 30 VAC. Relay
outputs include status/alarm, chiller solenoid valves,
oil heater, oil pump starter and chilled and condenser
water pump starters, etc. Triac outputs include pre-ro-
tation vane control and variable orifice control.
Serial Data
is transmitted to and received from devic-
es in RS-232, RS-485 and TX/RX (opto-couple) form.
The OptiView Control Center supports three types of
starters; Electromechanical Starter, Solid State Start-
er and Variable Speed Drive. However, all OptiView
Control Centers contain the following standard compo-
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
provides certain control and interface functions for the
starter type applied. Each starter type requires a differ-
ent board as follows:
• Electromechanical Starter – CM-2 Current Module.
• Solid State Starter (Style A) – Logic Board
Solid State Starter (Style B) – None.
• Variable Speed Drive - Adaptive Capacity Control
Board (except those VSDs that communicate with
the microboard using Modbus protocol).
•
Figure 1 on page 22 through 4
are OptiView
Control Center block diagrams of the three starter
types. On each block diagram, the standard com-
ponents are shown, along with the printed circuit
board that supports the applied starter type.
ure 8 on page 29 and Figure 9 on page 30
are Operation Sequence timing diagrams of the
different starter applications.