Lakeshore 340 - Operation; General Operation; Input Setup; Temperature Control

Lake Shore Model 340 Temperature Controller User’s Manual
Options and Accessories 10-15
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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.