TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 10 08/09/25 Thomson Technology
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zeroing, factory zero calibration should provide accurate readings with no adjustments
required. Zero calibration is only required on first time setup of new software where zero
correction factors are unknown. Using the original correction factors determined at the factory
as noted on the supplied Program Data Sheets can be reapplied as these values are
associated to sensing resistor error factors of the TSC 800 circuit board (not a software
offset).
Should field calibration of any voltage-sensing circuitry be required, the following procedure
may be used.
WARNING
Voltage sensing circuits are capable of lethal voltages while
energized. Standard safety procedures should be followed and
be performed by qualified personnel only. Failure to do so may
cause personnel injury and/or death.
7.6.1. GENERAL
7.6.1.1. To access the TSC 800’s software programming loop for
programming, the program menu must be selected, the Yes prompt entered
and the Read/Write Security Mode password number (or higher) must be
entered.
7.6.1.2. Once the programming loop has been accessed, scroll to the voltage
calibration screens as shown below.
UTIL AB
ZERO
127
600V
Displays the selected supply’s phase voltages to be calibrated.
Displays the type of calibration function, either ZERO or SPAN.
Displays the calibration correction factor number (0-255) used to obtain the
correct voltage reading. NOTE: To correctly calibrate any of the voltage
sensors, the ZERO function must be calibrated before the SPAN function. A
calibration correction factor number of 127 is typical of no correction offset
being applied, decreasing this value will apply a negative offset and
increasing this value will apply a positive offset.
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