21
Table 17 — Operating Types
OPERATING TYPE SELECTION — The operating type
is selected through the main interface by pressing the Start/
Stop button .
If the unit is running, pressing the Start/Stop button dis-
plays a screen with a Confirm Stop button (see Fig. 21),
which when pressed switches the chiller to Local Off mode.
If the unit is Off, pressing the Start/Stop button shows a list of
operating types with the currently selected type correspond-
ing to the last running operating type (Fig. 20).
Start/Stop Selection Screen
— In Local mode (LEN bus), the
Touch Pilot treats the Start/Stop button as a hotkey, and goes
directly to the Start/Stop selection screen. In CCN mode, the
Touch Pilot ignores Start/Stop key presses.
Start a Stopped Machine
— With the unit in the Local off
mode, press the gray Start/Stop button
to display the list of
operating modes and select the required mode.
Stop a Running Machine
— To stop a running unit, press the
green Start/Stop button . Confirm the unit shutdown by
pressing Confirm Stop or cancel by pressing the Back button
(Fig. 21).
Once the unit has been stopped, the Home screen is
displayed.
NOTE: Start/Stop a machine is not authorized through a web
connection for security reasons.
Machine On/Off Function — The machine operating
state can be viewed by going to Main Menu General Param-
eters Run Status. Table 18 summarizes possible unit states.
Table 18 — Unit States
Table 19 summarizes the unit control method and stop or go
status with regard to the following parameters set in the Touch
Pilot:
• Active operating type: Operating Type as selected on the
unit Start-Stop screen.
• CHIL_S_S: Current CCN chiller start/stop force com-
mand (enable/disable). Main Menu General Parame-
ters Net:Cmd Start/Stop.
• Onoff_sw: Start-stop contact status when unit is under
remote operating type. Main Menu Inputs Status
Remote On/Off Switch.
• chil_occ state: Chiller occupied state. If the occupancy
override input switch is closed, the chiller remains occu-
pied regardless of the set point scheduled selection. Main
Menu General Parameters Net:Cmd Occupied.
• ms_ctrl: Master control type. This parameter status will
determine if the master unit is going to be controlled
locally, remotely, or through CCN. Main Menu Main-
tenance Menu Master Slave Control (0=disabled,
1=master, 2=slave).
• EMSTOP: CCN emergency stop command (enable/dis-
able). Main Menu General Parameters Emergency
Stop
• Alarm shutdown: Unit is totally stopped due to alarm.
OPERATING TYPE CONTROL METHOD
OPERATING
MODES
DESCRIPTION
LOCAL — OFF
Local Off
The unit is under Local control method. It will remain halted and will ignore all
CCN network commands and remote switch contacts.
LOCAL — ON
Local On
The unit is under Local control method and will be allowed to start. The control
will ignore all remote control contacts (except the demand limit contact) and all
CCN network force commands (except the Emergency Stop Command).
LOCAL — SCHEDULE
Local Schedule
The unit is under Local control method and will be allowed to start if the
schedule #1 is occupied (chil_occ). Otherwise, the unit will remain off. The
control will ignore all remote control contacts (except the demand limit con-
tact) and all CCN network force commands (except the Emergency Stop
Command).
NETWORK
CCN None
The unit is under CCN control method and will be controlled by CCN force
commands. The control will ignore all remote control contacts (except the
demand limit contact).
REMOTE
Remote None
The unit is under Remote control method and will be controlled by the start/
stop and set point contacts. In this mode, no CCN force command can affect
the unit control except the Emergency Stop Command.
MASTER
Master Master
The unit is configured as the master unit in a two-unit master/slave plant. The
master unit control method can be done locally, remotely or through CCN
commands upon the master/slave configuration.
STATE DESCRIPTION
Off Unit is commanded to be off
Stopping
Unit is currently stopping (after a manual, emergency,
or shutdown request). Next state will be Off.
Delay
Unit is in delay at start-up (waiting for the end of the
On/Off delay to be reached). Next state will be
Running.
Running
Unit compressor capacity is more that 0% (unit has
started running)
Ready
Unit compressor capacity is 0%. Unit is ready to
start.
Override
The compressor cannot start because of an override
(SST, SCT, etc.)
Tripout Unit is Off due to an alarm
Test Unit is in Quick Test
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