
FORM 160.54-O1
ISSUE DATE: 9/10/2014
JOHNSON CONTROLS
176
SECTION 3 - DISPLAY MESSAGES
ers, the range is 150 (default) to 900 seconds). With
earlier software versions, the duration is fixed at 150
seconds.
Start Inhibit
The chiller is prevented from being started due to the
reason displayed on the Details Line of the Status Bar.
Vanes Closing Before Shutdown
Displayed while the Pre-rotation Vanes are closing
during a Soft Shutdown. During Soft Shutdowns, the
Vanes are driven fully closed prior to shutting down the
compressor. When the Vane Motor End Switch closes,
indicating the Vanes have fully closed (or 3.5 minutes
have elapsed, whichever occurs first), the Run Signal
is removed from the compressor motor starter and a
System Coastdown is performed. Soft Shutdowns are
initiated by the following:
1. Leaving Chilled Liquid – Low temperature
2. Remote Stop
3. Multi-Unit Cycling – Contacts Open
4. System Cycling – Contacts Open
5. Control Panel – Schedule
6. Operator Initiated at Keypad (Flash Memory Card
version C.MLM.01.06.xxx and later)
While the Vanes are closing during any Soft Shutdown,
if a Local Stop is initiated with the Compressor Switch
or any faults other than those listed above occur, the
Soft Shutdown is terminated and it will immediately
perform a System Coastdown.
RUN MESSAGES
Leaving Chilled Liquid Control
The chiller is running, controlling the Leaving Chilled
Liquid to the Leaving Chilled Liquid Temperature Set-
point. There are no system conditions inhibiting this
operation.
Heat Pump – Leaving Chilled Liquid Control
(Software version C.OPT.01.23.307 and later)
The Heat Pump is running, controlling the Leaving
Chilled Liquid Temperature to the Leaving Chilled
Liquid Temperature Setpoint. In this mode, Heat Pump
Duty is enabled and the Heat Pump Duty Operational
mode setpoint is set to Cooling mode.
Heat Pump – Leaving Condenser Liquid Control
(Software version C.OPT.01.23.307 and later)
The Heat Pump is running, controlling the Leaving
Condenser Liquid Temperature to the Leaving Con-
denser Liquid Temperature Setpoint. In this mode,
Heat Pump Duty is enabled and the Heat Pump Duty
Operational mode setpoint is set to Heating mode.
Current Pulldown Limit
The Pulldown Demand Limit Setpoint timer is in effect
and the Compressor Motor current is greater than or
equal to the Pulldown Demand Current Limit Setpoint
value. The Pre-rotation Vane operation is being inhib-
ited as described in Motor – High Current Limit mes-
sage below.
Motor – High Current Limit
The Compressor Motor current is greater than or equal
to the local or remote Current Limit Setpoint. The Cur-
rent Limit Setpoint is programmed over a range of 30
to 100% of the Chiller Full Load Amps (FLA). When
the motor current increases to the Inhibit Open thresh-
old, the Pre-rotation Vanes are inhibited from further
opening. This prevents a further current rise. If the
current continues to rise to the Start Close threshold,
the Vanes begin closing until the current falls to the
Stop Close threshold. Automatic Vane operation is re-
sumed and this message automatically clears when the
motor current decreases to the Allow Open threshold.
The thresholds are different for the various motor start-
er applications. To allow field calibration of the Solid
State Starter (Mod “A”) Logic Board or CM-2 Current
Module, pressing the Pre-rotation Vanes OPEN key in
SERVICE access level, starts a 10 minute timer during
which the current limit thresholds are elevated. Refer to
table:
VANE CONTROL
MOTOR CURRENT (%FLA)
ELECTRO-
MECHANICAL/
SOLID STATE
STARTER
VSD SERVICE
MODE
On rise, inhibit open
100
100
107
On fall, allow open
98
98
106
On rise, start close
104
103
110
On fall, stop close
102
101
109
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