Lake Shore Model 340 Temperature Controller User’s Manual
Options and Accessories
10-15
13
12
11
10
9
8
7
6
5
4
3
2
1
25
24
23
22
21
20
19
18
17
16
15
14
25-Pin Connector.eps
Input Connector (Input C)
Input Connector (Input D)
PIN DESC. PIN DESC. PIN DESC. PIN DESC.
1 NC 1 NC
2 S
14
S 2 S 14 S
3 C1I+
15
C1I– 3 D1I+ 15 D1I–
4 C1V+
16 C1V– 4 D1V+ 16 D1V–
5 S
17
S 5 S 17 S
6 C2I+
18
C2I– 6 D2I+ 18 D2I–
7 C2V+
19 C2V– 7 D2V+ 19 D2V–
8 S
20
S 8 S 20 S
9 C3I+
21
C3I– 9 D3I+ 21 D3I–
10 C3V+ 22 C3V– 10 D3V+ 22 D3V–
11 S 23 S 11 S 23 S
12 C4I+ 24 C4I– 12 D4I+ 24 D4I–
13 C4V+ 25 C4V– 13 D4V+ 25 D4V–
Figure 10-10. Sensor Input Connector
10.6.4 Operation
10.6.4.1 General
Operation
When the 3468 option is installed the Model 340s front panel allows configuration of
C1—C4
,
D1—D4
inputs
on most menu screens along with the standard
A
and
B
inputs. Follow instructions in this manual for the
A
and
B
inputs and
C
and
D
can be accessed from the setting screens when available.
For an example of option input selection, press
Input Setup
to display the
INPUT SETUP
screen. Use the
Up
Arrow
and
Down Arrow
keys to select inputs
A
,
B
,
C
, or,
D
. Select
C
or
D
and press
Enter
.
Use the
Up
Arrow
and
Down Arrow
keys to select a channel,
1-4
, for the selected input. Press
Enter
again to display
available settings for the option.
10.6.4.2 Input
Setup
In the
INPUT SETUP
screen,
Enable
,
Curve
, and
Type
can be changed. Only
Enable
and
Curve
can be
different for the channels in an input group.
Type
must be the same for all sensors in the group.
Sensor Unit
,
Temp Coeff
,
Excitation
, and
Range
of the selected sensor type are shown for references only and cannot
be changed independent of the type setting.
10.6.4.3 Temperature
Control
Any of the optional sensors can be chosen as the control channel for either control loop. Control from an
option input is not recommended in most applications because the multiplexing necessary to read all
channels can disrupt control. Good control performance can be achieved when the other three channels in an
input group are disabled.