9
2.3.2 Gain Adjust
The GAIN ADJUST varies the overshoot and stability of the control loop
circuitry in order to accommodate different thermal characteristics of
thermistors, the TE module and heatsink, and mounting structures.
Sections 3.2, 3.3, 3.4 and 3.5 present the details of using TE modules, IC
sensors, thermistors, and how physical mounting arrangements affect the
operation of the Model 300 Series Temperature Controllers. An initial GAIN
value is set at the factory and should be satisfactory for most mounts.
Adjusting the GAIN is described in Section 3.6.2 (i).
2.3.3 Sensor Select Switch
This 2-position DIP switch is used to select the appropriate bias for each
one of the sensor types. The switch position for each sensor is printed on
the rear panel next to the switch.
2.3.4 Output Connector
Connection to the TE module and temperature sensor are made using a 15-
pin, D-sub connector. There are two pins each for the TE+ and TE− connec-
tions to provide redundancy and reduce the voltage drop in the cable.
Wire Color
Pin # Connection (300-02 cable)
1 & 2 TE + RED
3 & 4 TE − BLACK
5 TE SHIELD
6 SENSE SHIELD
7 SENSOR + GREEN
8 SENSOR − WHITE
2.3.5 AC Power Inlet
The input voltage setting is indicated in a small window on the face of the
power module. A small screwdriver is needed to flip down the panel once
the AC line cord is removed. Carefully rotate the plastic tumbler so the
proper range is indicated. The fuse is also located behind this panel and
can be pulled out, to be replaced with the appropriate size indicated on the
back panel.
All units are preset at the factory for operation at 180–250 V
AC
, 50–60 HZ.
The line cord supplied with each unit should be plugged only into a prop-
erly grounded three prong outlet to prevent electrical shock in the event of
an internal short circuit to the metal cabinet.
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