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SECTION 36 - SOFTWARE ENHANCEMENTS
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
36
SI0212 - SOFTWARE ENHANCEMENTS (VER 21) EFFECTIVE JUNE 2009
GENERAL
Beginning August 2009, enhanced software will be
supplied in new production YK chillers and replace-
ment microboard kit (P/N 331-02430-601). This soft-
ware is backward compatible to all previous chillers
equipped with microboard (P/N 031-02430-000) or
(031-02430-001. The enhancements are listed below.
The version and program card part number is
C.OPT.01.21-307 (031-02474-001).
LARGE TONNAGE CHILLER I/O Board
This software version supports the new LTC I/O Board
(P/N 031-02895-000/001). This board communicates
with the microboard COM3 serial port (J12-2/3) using
RS-485 Modbus protocol communications. This board
is used for HOT GAS bypass, HEAT RECOVERY
and HEAD PRESSURE CONTROL screen options. It
interfaces the microboard to the components used for
these options. A new diagnostics screen was created
from the diagnostics screen to support this board.
OPTISAVE 2 KW INPUT
The Optisave 2 KW input (4 to 20mA) will now be
wired to the LTC I/O Board (TB9-1/2), if present.
PRE-ROTATION VANES POSITION
POTENTIOMETER
Previously, only those chillers equipped with VSD, hot
gas bypass or VGD were equipped with a PRV position
potentiometer. All new chillers will be equipped with a
PRV potentiometer, regardless of other options.
To allow this software to be backward compatible to all
previous chillers not equipped with a PRV potentiom-
eter or the options listed above, a new key labeled PRV
POSITION was added to the SETUP screen, which
allows the PRV potentiometer input to be enabled or
disabled.
If equipped with any of the above options, this setpoint
is automatically set to enabled, and cannot be changed.
If not equipped with any of the above options nor with
a PRV potentiometer, this should be set disabled. If
not equipped with any of the above options but factory
equipped with a PRV potentiometer, the software reads
the potentiometer input at microboard input J7-10.
VSD ADAPTIVE CAPACITY CONTROL
ENHANCEMENTS
The following enhancements were added.
ACC Details Screen - New Setpoints
New setpoint were added as follows:
•
VSD Start Frequency –
Allows the service tech-
nician to set the starting frequency from which the
ramp-up will begin. Only shown Modbus protocol
configuration. GPIC object AV36. Programmable
over the following range:
a. 60Hz units – 30Hz to 60Hz (default 45Hz)
b. 60Hz units with Quick Restart – 30Hz to
45Hz (default 45Hz)
c. 50Hz units – 25Hz to 50Hz (default 37.5Hz)
d. 50Hz units with Quick Restart – 25Hz to
37.5Hz (default 37.5Hz)
•
ACC Mapping Enable –
Allows the service tech-
nician to set the Delta T (LCLT setpoint) needed
to be met to enable surge mapping and speed re-
duction initially on startup. Only shown in Mod-
bus protocol configuration. Programmable over
the range of 0.5°F to 4.0°F (default 1.0°F). GPIC
object AV37.
•
Surge Sensitivity –
This key is now only shown
in Modbus protocol configuration.
ACC Surge Mapping
In Modbus Protocol configuration, ACC surge map-
ping is now inhibited during soft shutdowns.
ACC Current Limiting
In this software version, when in Modbus protocol
configuration, if the motor current is greater than or
equal to 101 % FLA, the VSD speed command is de-
creased 0.1Hz every 3.0 seconds until the motor cur-
rent is less than 101 %FLA. The surge map takes pri-
ority over current limiting. Thus, if there is a mapped
surge point in the present sector, ACC current limiting
shall not be allowed to decrease the frequency below
the mapped point.