Automation Direct DL405 User Manual page 188

10–4
F4-08THM 8-Channel Thermocouple Input
Setting the Module Jumpers
Jumper
Locations
Calibrate Enable
Use the figure on the following page to locate the bank of ten jumpers on the PC
board. Notice that the description of each jumper is just to the right of the jumpers on
the PC board. To prevent losing a jumper when it is removed, store it in its original
location by sliding one of its sockets over a single pin. You can select the following
options by installing or removing the appropriate jumpers:
S
Number of channels
S
Input type
S
Conversion units
S
Calibrate enable
See the following figure to locate the "Calibrate Enable" jumper. The jumper comes
from the factory in the "jumper removed" setting (the jumper is installed over only
one of the two pins). Installing this jumper disables the thermocouple active
burn-out detection circuitry, which enables you to attach a thermocouple calibrator
to the module.
To make sure that the output of the thermocouple calibrator is within the 5V
common mode voltage range of the module, connect the negative side of the
differential voltage input channel to the 0V terminal, then connect the thermocouple
calibrator to the differential inputs (for example, Ch 3+ and Ch 3).
For the voltage input ranges, this jumper is inactive and can be installed or removed
with no effect on voltage input.