Johnson Controls YORK OPTIVIEW YK Series Service Instructions Manual page 16

SECTION 2 - SYSTEM ARCHITECTURE
The microprocessor and all supporting logic circuits,
along with the memory devices containing the operat-
ing program, reside on the microboard. All chiller op-
erating decisions are made here. It receives analog and
digital inputs from the chiller and remote devices. The
analog inputs are connected directly to the microboard.
The Digital inputs are received via the I/O Board (see
description below). Under Program control, the mi-
croboard operates the relays and triacs that are located
on the I/O Board.
The control center will be equipped with one of the fol-
lowing Microboards:
• 031-01730-000 – Shipped in new production
chillers until January 2004. The program resides
in a replaceable Flash memory card. The software
version is C.MLM.01.xx.yzz. It is printed on a la-
bel adhered to the card. The Program can be up-
graded by replacing the card.
• 031-02430-000 – Shipped in new production chill-
ers from January 2004 to June 2006. The pro-
gram resides in non-removable onboard memory.
The software version is C.OPT.01.xx.yzz, and is
viewable on the DIAGNOSTICS Screen in SER-
VICE access level. The Program can be upgraded
by downloading a new program from a Program
card. Program cards are shirt-pocket-size portable
memory storage devices. This board is backward
compatible to YK chillers presently using the 031-
01730-000 Microboard.
• 031-02430-001 – Shipped in new production chill-
ers after June 2006. This is an upgraded version of
the 031-02430-000 Microboard. The upgrade is
necessary to operate with the Medium Voltage Sol-
id State Starter, Medium Voltage Variable Speed
Drive and those Variable Speed Drives and Style B
Solid State Starters that serially communicate with
the microboard using Modbus Protocol.
The upgrade includes a larger BRAM (U38) and
an additional RS-485 port on COM2 serial port
for Modbus communications. When used in larger
BRAM configuration, requires software version
C.OPT.01.15.xxx (or later). This board is back-
ward compatible with YK chillers presently using
the microboard 031-01730-000 or 031-02430-000.
Since the newer versions microboard are backward
compatible to earlier vintage OptiView™ Control Cen-
ters, earlier chillers could be equipped with a later ver-
sion microboard due to service replacement.
16
The software versions
C.OPT.01.xx.yzz) are alphanumeric codes that are
interpreted as follows. Each time the controls section
or language section is revised, the respective revision
level increments.
• C – Commercial chiller
• MLM – Used on Microboard 031-01730-000
• OPT – Used on Microboard 031-02430-000/-001
• 01 – YK chiller
• xx – controls revision level (00, 01, etc)
• y – language package (0=English only, 1=NEMA,
2=CE, 3=NEMA/CE )
• zz – language package revision level (00, 01, etc)
Throughout this manual, reference is made to functions
and features that are only available in certain flash
memory card revision levels (C.MLM.01.xx.xxx). To
cross reference C.MLM software to C.OPT software,
refer to the controls revision level. Software version
C.OPT.01.09.xxx is of the same controls revision level
as C.MLM.01.09.xxx. From this starting point, both re-
ceive the same updates at each revision. However, be-
ginning with the release of version C.OPT.01.15.011,
C.MLM software will no longer be revised to include
new features. Software upgrades should only be per-
formed by a Service technician.
The I/O Board acts as an input/output device for the
microboard. It conditions the digital input signals for
the microboard and contains relays and triacs that are
controlled by the microboard to control solenoids, mo-
tor contactors and actuators. The 115VAC digital in-
puts from switch and relay contacts are converted to
logic level voltages by opto-couplers. The relays have
+12VDC coils that are energized and de-energized by
the microboard. The contacts of these relays control the
115VAC system solenoids, relays and motor contactors.
The triacs are turned ON and OFF by the microboard.
The outputs of these triacs control actuators.
Chillers equipped with the Variable Geometry Diffuser
(VGD) are supplied with and require I/O Board 031-
01743-002. This board is populated with the required
Triacs Q3 and Q4 that apply the open and close sig-
nals to the Variable Geometry Diffuser ring actuator.
Refer to SECTION 25 - VARIABLE GEOMETRY DIF-
FUSER.
FORM 160.54-M1
(C.MLM.01.xx.yzz or
JOHNSON CONTROLS