Active operating type Parameters' status
Control
type
Unit
state
LOFF L-C L-Sc Rem Net Mast
Start/
Stop force
command
Remote start/
stop contact
Master
control
type
Start/Stop
schedule
Network
Emergency
Shutdown
Alarm
shutdown
enable
off
yes
off
active local
off
active unoccupied local
off
active open remote
off
active unoccupied remote
off
active disable network
off
active unoccupied network
off
active local unoccupied local
off
active open remote remote
off
active remote unoccupied remote
off
active disable network network
off
active network unoccupied network
off
active disable no local
on
active occupied disable no local
on
active closed occupied disable no remote
on
active enable occupied disable no network
on
active local occupied disable no local
on
active closed remote occupied disable no remote
on
active enable network occupied disable no network
on
IMPORTANT: When the unit is stopping or there is a demand to stop the unit, compressors are stopped consecutively. In case
of emergency stop, all compressors are stopped at the same time.
8 - STANDARD CONTROL OPERATIONS AND OPTIONS
8.1 - Start/stop control
The unit state is determined based on a number of factors,
including its operating type, active overrides, open contacts,
master/slave conguration, or alarms.
The table given below summarizes the unit control type [ctrl_typ]
and its running status with regard to the following parameters:
■ Operating type: This operation type is selected using the Start/
Stop button on the user interface.
LOFF Local off
L-C Local on
L-SC Local schedule
Rem Remote
Net Network
Mast Master unit
■ Start/stop force command [CHIL_S_S]: Start/stop force
command can be used to control the chiller state in the Network
mode.
- Command set to stop: The unit is halted.
- Command set to start: The unit runs according to schedule 1.
■ Remote start/stop contact status [Onoff_sw]: Start/stop
contact status can be used to control the chiller state in the
Remote operating type.
■ Master control type [ms_ctrl]: When the unit is the master
unit in a two-chiller master/slave arrangement, the master unit
may be set to be controlled locally, remotely or via network.
■ Start/stop schedule [chil_occ]: Occupied or unoccupied
status of the unit.
■ Network emergency stop command [EMSTOP]: If activated,
the unit shuts down regardless of the active operating type.
■ General alarm: The unit shuts down due to failure.
8.2 - Cooling / Heating
The table below summarises the unit operation based on the
following parameters:
■ Unit On/Off status: This parameter indicates whether the unit
is shut down (not authorised to start) or in operation (authorised
to start).
■ Control type: Indicates whether the unit operates in Local,
Remote or Network mode.
■ Heating/Cooling selection in Local mode: The operating mode
is selected via the user interface (GENUNIT menu).
■ Heat/Cool switch status in Remote mode: This contact is active
only when the unit is under remote control.
■ Heat/Cool selection in Network mode: The network command
[HC_SEL] permits heating/cooling control if the unit is in
Network operating mode.
Status
Control
type
Heat/Cool
in Local
Heat/Cool
in Remote
Heat/Cool
in Network
Current unit
operating
mode
Off - - - - -
On local cool - - cooling
On local heat - - heating
On remote - on_cool - cooling
On remote - on_heat - heating
On network - - cool cooling
On network - - heat heating
8.3 - Control interlock contact
This contact checks the status of a loop (customer safety loop).
It prevents the unit from starting if it is open when the delay at
start-up has expired. This open contact leads to an alarm shut-
down, if the unit is running (alarm 10014).
25
To Next Page
Loading...
Need help?
General
