181-122018_THCD-101 Instruction Manual
Page 13 of 26
Func
No function
◄
Go to Main Menu screen
►
Enable setpoint mode override, active for 2 seconds
►
(override mode)
Change setpoint mode to AUTO
▲
Change setpoint value (main screen changes as below)
▲
(override mode)
Change setpoint mode to OPEN
▼
Change setpoint value (main screen changes as below)
▼
(override mode)
Change setpoint mode to CLOSE
Zero
Perform input rezero (if held for 3 seconds)
(b) Main Screen (changing Setpoint)
When performing a setpoint change, the main screen is as previously, but with the addition of the current
setpoint value (initiated via an initial press of the
‘▲’
or
‘
▼’
switches). Note that the setpoint value is
not permanent
–
if the
‘▲’
or
‘▼’
switches are not pressed at all for 3 seconds, then the setpoint value
disappears.
(c) Main Screen (Setpoint Valve Control)
Rather than commanding the setpoint to a specific value, the setpoint mode can be changed to Open or Closed
which overrides any previously set value. Again the main screen shows everything as normal, but with the
addition of the OPEN or CLOSE identifier if this mode has been set. By putting the device into override mode it
is possible to force the setpoint to be Open or Closed. This is done by pressing the override switch then the
appropriate mode switch. Either mode can be cancelled by switching back to Auto mode (by effectively
pressing the override switch twice).
(d) Main Menu Screen
The Main Menu screen allows the user to select screens
that are used for the configuration of the THCD-101 – the
setpoint (initial value, initial mode, source), input (range,
full scale, units string), comms, filtering and relays can all
be configured from screens selected via the main menu. It
is also possible to reset settings to their factory defaults
from the Main Menu screen. Only 4 options can be shown on
the screen at any one time, so the menu list scrolls up until
the last item is shown, and then the selection arrows move
down to allow for selection of any menu item.
Switch Functions:
Func
Go back to Main screen
◄
No function
►
No function
▲
Go to previous menu selection
▼
Go to next menu selection
Zero
Go to screen associated with menu selection
(e) Setpoint Screen
From the setpoint screen you can edit the value of the command setpoint as well as change the mode (AUTO,
OPEN, CLOSED) and the source (INTERNAL, SLAVE). If SLAVE is selected then the percentage sign (%) appears
next to the SP value. For more information on the command setpoint, see the Principles section - 7.4.
Switch Functions:
Func
Go back to Main Menu screen
◄
Select previous character when in edit mode
►
Select next character when in edit mode
▲
Move edit field selection up
▼
Move edit field selection down
Zero
Go to edit mode for currently selected field
