364
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 36 - SOFTWARE ENHANCEMENTS
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
In previous software versions, the initial ramp is com-
plete when either of the following conditions occur:
• Delta T less than ACC Mapping Enabled
• VSD Speed Command Equals Maximum
In this version, the initial ramp will be complete when
any of the following occur:
• Delta T Less Than ACC Mapping Enable
• VSD Speed Command Equals Maximum
• Motor Current Greater than or Equal to 100 %
FLA
Stability Limit
The STABILITY LIMIT PROGRAMMING button
was removed from the ACC DETAILS screen in a pre-
vious software version. The stability limit default and
maximum values are set to 7000. If a new version of
software was installed in a chiller with stability limit
set below 7000, the old value would be retained. The
only way to clear it would be to clear the BRAM. To
prevent this from happening, this value is no longer
programmable. It is now always set to 7000.
Surge During Initial Ramp
In previous software versions, if two surges are detect-
ed during the initial ramp (ramp towards maximum fre-
quency after reaching start frequency), the command
frequency is set to the maximum frequency regardless
of motor current, which can result in motor current ris-
ing sharply and forcing vanes to have to close hard and
even possibly trip on high current or overload.
In this software version, for every two surges that are
detected during the initial ramp, increase the command
frequency (no higher than the maximum frequency) by
the amount listed in the following table. After increas-
ing the command frequency, the initial ramp surge
count is reset so it can react to another two surges and
the initial ramp shall be continued. This logic shall be
in effect during the entire initial ramp and take action
as many times as necessary.
FREQUENCY COMMAND
INCREASE
MOTOR
CURRENT
1.0 Hz
More than 90 %FLA
1.5 Hz
More than 75 %FLA
2.0 Hz
More than 60 %FLA
4.0 Hz
Less than or equal to
60 %FLA
VSD High Instantaneous Current Fault
In previous software versions, the VSD-HIGH PHASE
X INSTANTANEOUS CURRENT fault (VSD) and
VSD-HIGH INSTANEOUS CURRENT fault (MV-
VSD) are a cycling shutdown. In this version, they
become a safety shutdown if the same fault (on any
phase) occurs three times in 90 minutes. The first two
shutdowns with the 90-minute window will be cycling
shutdowns, as it is presently. If a third one occurs with-
in 90 minutes of the first, the third will be a safety shut-
down that requires a manual restart.
The 90-minute window applies to a HIGH INSTAN-
TANEOUS fault on any phase. Three faults on any
phase in 90 minutes results in the third fault becoming
a safety shutdown. Likewise, one fault on each of the
three phases results in the third fault becoming a safety
shutdown.
Refrigerant Level Control Enhancements
During the Valve Preset Time and subsequent 3 minute
hold period after entering System run on startup, if the
actual refrigerant level is greater than the programmed
Level setpoint for 2 seconds, the preset/hold timer is
canceled and normal level control is started immedi-
ately. This only applies to the programmed Level Con-
trol setpoint and not the Ramped Level setpoint and
only occurs while the chiller is running.
Korean Language
Korean has been added to the available languages.
Oil Sump Enhancements
In previous software versions, the Oil Return Solenoid
(1SOL) is opened one minute into System run and re-
mains open until System Coastdown.
SI0212 - SOFTWARE ENHANCEMENTS (VER 21) EFFECTIVE JUNE 2009 (CONT'D)