Lake Shore Model 340 Temperature Controller User’s Manual
4-2
Front Panel Operation
4.2.1 Normal
Display
The normal display is what the instrument shows
under normal operating conditions, when the user is
not changing a setting, and there is not a hardware
failure detected. The top line of the display is
dedicated to showing instrument status. Status
annunciators appear on the top line when applicable.
Annunciators that may be seen include:
Tune
,
Logging
,
Program
,
Ramping
,
Alarm
,
Remote
,
and
Locked
.
The next four lines are used to show sensor input
readings. This area is configurable by the user to
show between one and eight readings. From one to
four readings can be shown in large characters, five
to eight readings are shown using smaller characters.
The bottom three lines show control settings and status. This area is configurable to show information from
one or two control loops. If one loop is being displayed, the heater output can be shown in large characters.
Some examples of normal display configurations are shown here. Instructions on how to change the display
configuration are provided in the following paragraphs.
4.2.2 Setting
Displays
Users may enter common parameters like control setpoint directly from the normal display. Other instrument
setup parameters have unique setting displays that conveniently combine several related parameters on one
screen. For details, refer to Paragraph 4.4 – Keypad Navigation.
4.2.3 Data Entry Displays
Data entry displays are special setting displays. Their layout allows easy entry of data tables including
temperature response curves. They follow the same instructions as setting displays in Paragraph 4.4 –
Keypad Navigation.
4.2.4 Error
Displays
Some error conditions are part of normal operation and do not prevent the instrument from operating. Error
messages for these will be shown on the normal display and the instrument will continue to operate until the
situation is corrected. Errors that prevent the instrument from functioning properly can result in an error
display that replaces the normal display. In this case the instrument will not try to operate until the error has
been corrected. Error messages are summarized in Paragraph 11.9.
Some errors result from mistakes made when changing instrument settings or entering data. If this happens,
read and follow the instructions shown. Also verify the settings by going back to the setting screen after the
instrument has shown a normal display.
4.3 KEYPAD
DESCRIPTION
The Model 340 has 40 keys on its keypad which help prompt the operator in using the large number of
powerful software features. This section will help the user understand the keypad layout and how to quickly
get to the features of interest.
The Model 340 keypad is divided into three groups. The group of 16 keys near the display are used for
temperature control features. The middle group of 16 keys has two functions. The key tops are labeled with
numbers and symbols for number entry. Above these keys are labels for temperature measurement, display
and interface features. The last group of 8 keys is used for navigating in setting screens and has a few spare
keys for features that the operator may need quickly.
+1.0 0 3 3 8
8 6 .0 8 4
V
K
A
A
+0 .999 5 6
8 8 .0 2 0
V
K
B
B
L o o p 1 C h a n n e l A
S e t p + 0 .0 0 0 0 0 V
H e a t D is a b le d
L o o p 2 C h a n n e l A
S e tp + 0 .0 0 0 0 0 V
O u tp u t
Normal Display with Both Loops Shown
+1.0 0 3 3 8
8 6 .0 8 4
V
K
A
A
+0 .999 5 6
8 8 .0 2 0
V
K
B
B
L o o p 1 C h a n n e l A
S e t p + 0 .0 0 0 0 0 V
H e a t D is a b le d
P
0 .0
I
0 .0 M O u t
D
0 .0 10 0 .0 0 %
Normal Display with One Loop Shown