System information

21
PIC 5 CONTROL OPERATION
Start-Stop Control —
This function controls the chiller
START-STOP command. There are four selectable control
modes: LOCAL, LOCAL SCHEDULE, REMOTE, or NET-
WORK. See Unit Start/Stop Screen on page 18. Specific con-
trol sources are valid to start or stop the chiller for each control
mode.
LOCAL — When the control mode is LOCAL, the chiller can
be started by the “Local ON” button on the PIC 5 interface
screen, and can be shut down by the Confirm Stop button on
the screen or by the EMSTOP software point.
LOCAL SCHEDULE — When the control mode is LOCAL
SCHEDULE, the chiller will be started automatically if the
configurable local schedule is Occupied. The chiller can be
shut down by the unoccupied schedule, the Stop button on the
PIC 5 interface screen, or by the EMSTOP software point.
REMOTE — When the control mode is REMOTE, the chiller
will be started by the remote discrete input (REM_CON) locat-
ed on the I/O board. The chiller can be shut down by the re-
mote discrete input, the Stop button on the PIC 5 interface
screen, or by the EMSTOP software point.
NETWORK — When the control mode is NETWORK, the
chiller can be started and stopped by the CHIL_S_S and
CHIL_OCC software points, which are written by other equip-
ment through network commands and network schedule. The
chiller can also be shut down by the EMSTOP software point.
NOTE: There is a STOP OVERRIDE point in the GENUNIT
table. If this point is enabled the chiller cannot be started and
will shut down the chiller if it is running.
Compressor Run Status — Compressor run status is
shown at the top of the system overview (home) screen. Table
10 lists the chiller status numbers, names, and descriptions.
Table 10 — Compressor Run Status
Chiller Start-Up Sequence
PRE-START CHECK — Once start-up begins, the controller
performs a series of pre-start tests to verify that all pre-start
alerts and safeties are within limits. Progress is shown on the
Startup Sequence screen (see Fig. 34). Table 11 lists pre-start
alert and alarm conditions.
Transmission Status
Oil Pump
HS Motor Bearing Temp HS Comp Bearing Temp
Oil Heater
LS Motor Bearing Temp
LS Comp Bearing Temp
Oil Supply Temperature
Oil Sump Temperature
Oil Pressure Difference
Fig. 32 — Transmission Status
Fig. 33 — HGBP (Hot Gas Bypass) Status
HGBP Status
HGBP Option
HGBP Mode
HGBP Status
HGBP Control Type
Available Lift
Actual Lift
Guide Vane Position
Surge Region
Surge Protection
STATUS
NO.
STATUS NAME DESCRIPTION
0 OFF STATSTOP is STOP, no alarm
1 CTLTEST Controls Test is active
2PUMPDOWN
Pumpdown in Controls Test is
active
3 LOCKOUT Lockout in Controls Test is active.
4 RECYCLE
Recycle shutdown completed on
low load in effect until the need for
cooling resumes; non-fault condi-
tion
5 TRIPOUT
Shutdown completed due to alarm
fault condition
6TIMEOUT
The controls are delaying the start
sequence until the Start to Start or
Stop to Start timers have elapsed
7 PRESTART
The chiller is in the process of sys-
tem checking before energizing the
compressor motor
8 STARTUP Normal startup in progress
9 AUTORST Auto Rapid Start in progress
10 RAMPING
Ramp loading in progress. The
chiller has started and is gradually
increasing its load to control electri-
cal demand charges.
11 RUNNING
The chiller has completed ramp
loading following start up. Normal
running mode, no override and not
in demand.
12 OVERRIDE Running with Override active
13 DEMAND
Running with Demand Limit active.
The chiller is prevented from load-
ing further because it has reached
an AVERAGE LINE CURRENT
limit or a MOTOR KILOWATTS
limit.
14 SHUTDOWN Compressor shutdown in progress
Startup Sequence
Fig. 34 — Start-Up Sequence Screen