A421 Control parameter setup menus
The A421 Temperature Controls have a Basic and
Advanced setup menu. You can use these menus to
scroll through the parameter setup codes, view and
edit parameter values, and set up your control for your
application requirement. The control also has a Restricted
adjustment menu. See
more information.
Note:
The A421 Control retains a copy of the saved
parameter values in memory. When you change
and save a new value, the new value immediately
overwrites the previous value and saves to memory.
In the event of a power failure, brown out, or when
you disconnect power from the control, all of the
current parameter values in memory are retained.
Reconnecting power to the control restores all of the
saved values.
Navigating the Basic and Advanced
menus
The A421 Control buttons and display operate the same
way in the Basic and Advanced menus. The parameter
code flashes on and off in any parameter code screen.
1.
To navigate through all of the parameter code
screens, press
Down
or
Up
.
2.
To exit either menu and return to the Main screen,
press
Down
and
Up
simultaneously.
3.
While in any parameter value screen, the parameter
value flashes on and off.
4.
To scroll through all of the available parameter values
for the associated parameter code, press
Down
or
Up
.
5.
With the preferred parameter value displayed,
press
MENU
to save the value and go to the next
parameter code screen.
Note:
If you do not press
MENU
to save a new
value, the control reverts to the last saved
value. After 30 seconds of inactivity, while in any
screen, the control reverts to the Main screen.
Basic menu
Use the Basic menu to quickly edit the On and OFF
temperature values, and the Sensor Failure Mode (SF).
See
Parameter codes and modes of operation
for more information regarding parameter codes, usable
parameter values, and default values.
Figure 6: Navigating the Basic menu
Viewing and changing values in the Basic
menu
In this task you access the Basic menu and view and
change the Basic parameter values.
1.
On the Main screen, press
MENU
. The LCD displays
OFF, which is the first parameter code screen
displayed in the Basic menu.
2.
To scroll through all of the basic parameter codes
and display the preferred code, press
Down
or
Up
.
3.
With the preferred parameter code displayed, press
MENU
to display the current parameter value for the
code.
4.
With the current parameter value displayed, press
Down
or
Up
to scroll through all of the parameter’s
usable values and display the preferred value.
5.
With the preferred parameter value displayed, press
MENU
to save the displayed value and go to the next
parameter code.
6.
To exit the Basic menu and go to the Advanced menu,
simultaneously press and hold
Down
and
Up
for 5
seconds.
Advanced menu
The Advanced menu allows you to change the parameter
values in the Basic menu and the values for the following
advanced parameter codes:
• Temperature Units (
Un
)
• Low Temperature Stop (
LtS
)
• High Temperature Stop (
HtS
)
• Low Temperature On-Time (
Ltt
)
• Minimum Relay On-Time (
Ont
)
• Cycle Period (
cP
)
A421 Series Electronic Temperature Controls with Cycle Timer Installation Guide
7
