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FORM 160.54-M1
ISSUE DATE: 10/25/2019
SI0283 - SOFTWARE ENHANCEMENTS (VER 26) EFFECTIVE APRIL 2014
GENERAL
Beginning in April 2014, enhanced software will be
supplied in new production YK chillers and replace-
ment microboard kit 331-02430-601. This software
is backward compatible to all previous YK chillers
equipped with microboard 031-02430-000 or 031-
02430-001. The enhancements are listed below.
The Panel Software version and program card part
number is: C.OPT.01.26.308 (P/N 031-02474-001)
The EPROM BIOS Software Version: C.OPT.00.04
(P/N 031-02429-002)
Head Pressure Control Output
Two setpoint buttons have been added to the Head
Pressure/Heat Recovery screen, "Minimum Position"
and "Shutdown Position". Access to this screen is
available at Service level and above. User changes to
these setpoints are recorded in the setpoints Report and
the History Log.
FIGURE 119 - HEAD PRESSURE CONTROL
SCREEN
The Minimum Position is active when the condenser
pump run contacts are closed which happens at chiller
start at the end of pre-lube. The minimum will act as a
maximum to the PID control if the Direction setpoint is
set to Reverse. The Shutdown Position is active when
the condenser run contacts are open which in the LC-
SSS is after coastdown and the SCR heatsink tempera-
tures are below 105°F. All other starter types open the
condenser pump run contacts at the start of coastdown.
JOHNSON CONTROLS
Both settings have a minimum limit of 0% and a maxi-
mum limit of 100% with an initial default position
of 0%.
P
I
D
The PID reaction can be tuned using the Change
Setpoints button and then selecting the P, I or the D
parameter.
Increasing the P value or Decreasing the I value will
speed up the rate of change of the valve signal.
MVVSD Power Fault Recovery / Catch A
Spinning Load CASL
Power Fault Recovery is an option that is available on
MVVSD drives. When the input power supply drops
below 85% of nominal voltage overall, the MVVSD
will deactivate the output to the compressor motor. The
drive can maintain adequate bus voltage charge level
for a power fault of up to 10 seconds long. During that
10 second period, the OptiView control panel will hold
the condenser level control, PRV, VGD, and Hot Gas
at the current commanded positions. If the input power
is restored within 10 seconds, the condenser level con-
trol, PRV, VGD, and Hot Gas will be returned to auto-
matic control. The VSD speed command will be set to
the same or slightly less than the VSD speed command
before the input power loss. After 10 seconds of input
power loss, the MVVSD drive will generate an Input
Power Supply fault.
LD18177
If the input power is restored within 30 seconds, an en-
hanced quick start is initiated. In enhanced quick start,
the condenser level control, PRV, VGD, and Hot Gas
will be returned to automatic control and coastdown
will be shortened and the chiller transitioned to run
while the compressor is potentially rotating.
A Power Fault Recovery screen has been added that
is accessible from the MVVSD screen and provides
Power Fault Recovery Control indication and configu-
ration.
JCI COMPANY CONFIDENTIAL
SECTION 36 - SOFTWARE ENHANCEMENTS
MINIMUM
MAXIMUM
0
5
0
5
0
5
DEFAULT
2
2
0
36
381
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