SECTION 3 - DISPLAY MESSAGES
JOHNSON CONTROLS
177
FORM 160.54-O1
ISSUE DATE: 9/10/2014
3
An example of current limit is as follows: If a Solid
Sate Starter chiller FLA is 100 Amps, and the Current
Limit Setpoint is 50%, the following will occur:
50 Amps – inhibit vane open
52 Amps – vanes begin closing
51 Amps – vanes stop closing
49 Amps – allow automatic vane control
With software versions prior to C.OPT.01.16.xxx, this
message is also displayed when the Compressor Motor
Variable Speed Drive has not yet reached full speed af-
ter having been commanded to do so in Manual Speed
Control mode.
Load Control Mode
(Software version C.OPT.01.16.xxx and later)
Access Level Required: SERVICE
The Compressor Motor Variable Speed Drive has not
yet reached full speed after having been commanded to
do so in Manual Speed Control mode. While this is dis-
played, the Pre-rotation Vanes are inhibited from further
opening.
START INHIBIT MESSAGES
Anti-Recycle XX min/Sec
The chiller is inhibited from starting because the 30
minute anti-recycle time has not yet elapsed. Time re-
maining is displayed.
Vane Motor Switch Open
The chiller is inhibited from starting because the Pre-
rotation Vanes are not fully closed.
Motor – Current >15% FLA
This start inhibit is instantaneously set whenever the
chiller is not running and a motor current of greater
than 15% FLA is detected. The oil pump is started as
soon as this fault is detected. The starting frequency
for the Variable Speed Oil Pump is 45.0Hz. The start
inhibit is released when the motor current decreases to
greater than or equal to 15% FLA and the Compres-
sor Switch is placed in the Stop-Reset (O) position. A
full System Coastdown is performed when this fault is
released. With software version C.MLM.01.10D.xxx
(and earlier) or C.OPT.01.10D.xxx (and earlier), the
motor current must exceed 15% FLA for 10 continu-
ous seconds before the start inhibit is set.
VSD – Frequency > 0Hz
(Software version C.MLM.01.14.xxx (and later) or
C.OPT.01.14.306 (and later))
This start inhibit is set whenever the chiller is shut-
down and a Compressor Motor Variable Speed Drive
(VSD) Output Frequency of greater than 0Hz is detect-
ed. This fault is released and the chiller can be start-
ed after the frequency is at 0Hz and the Compressor
Switch is placed in the Stop-Reset (O) position. The oil
pump is started (with a starting frequency of 45Hz) as
soon as this fault is detected. A System Coastdown is
performed whenever this fault is released.
LCSSS – High Temperature Phase X - Stopped
(Mod. “B” Solid State Starter only)
The chiller is stopped and the Liquid Cooled Solid
State Starter Logic/Trigger Board has detected that the
temperature of phase A, B, or C (designated as X in this
message) Silicon Controlled Rectifier (SCR) Module
is greater than 110°F. The starter cooling pump will run
and the chiller will be inhibited from starting until the
temperature decreases to less than 109°F.
WARNING MESSAGES
Warning – Real Time Clock Failure
During the initialization process that occurs when
power is applied to the Control Center, test data is writ-
ten to a location in the BRAM battery backed memory
device (IC location U52 on Microboard). This data is
then read from the BRAM and compared to the test
data. If the read data is not the same as that which was
written to the device, it is assumed the BRAM and Real
Time Clock operation is defective and this message is
displayed. The BRAM should be replaced by a quali-
fied Service Technician. This message automatically
clears when the BRAM problem has been solved.
Warning – Condenser or Evaporator XDCR Error
The Evaporator Pressure transducer is indicating a
higher pressure than the Condenser pressure transducer
after the chiller has been running for 10 minutes. This
is indicative of a Condenser or Evaporator transducer
failure. This message will be displayed until the condi-
tion clears and the WARNING RESET Keypad key is
pressed in Operator (or higher) access mode. Condition
not checked in Brine mode.
