© 2022
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WTC32ND TEMPERATURE CONTROLLER
ELIMINATING TRIMPOTS
To simplify set up or to minimize thermal drift, Wavelength
recommends that you eliminate trimpots in circuitry. The
following details how to use fixed resistances in place of
trimpots. Wavelength can load boards at the factory to your
specific requirements. Contact Sales to request a Product
Variation.
CHANGING THE P GAIN TO A FIXED VALUE
Once the system is optimized:
• Connect an ohmmeter to TP5 & TP6, without the
WTC32ND installed.
• Measure the PGAIN trimpot value across pins TP5 &
TP6.
• Remove resistor P2.
• Load P1 with a resistor of the value measured
(1206 size).
BOTTOM VIEW
RESISTOR LOCATIONS
TOP VIEW
TEST POINT LOCATIONS
Figure 30. P GAIN Settings
INCREASING PROPORTIONAL GAIN RANGE
•
Change P2 to a 100 kΩ resistor for PMAX = 75 A / V.
•
Remove P2 (in finite resistance) for PMAX = 100 A / V.
CHANGING THE I TERM TO A FIXED VALUE
Once the system is optimized:
• Connect an ohmmeter to TP6 & TP7, without the
WTC32ND installed.
• Measure the I TERM trimpot value across pins TP 6 &
TP7.
• Remove resistor I2.
• Load I1 with a resistor of the value measured
(1206 size).
BOTTOM VIEW
RESISTOR LOCATIONS
TOP VIEW
TEST POINT LOCATIONS
Figure 31. I TERM Setting
