TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 10 08/09/25 Thomson Technology
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7.6.3.2.5. With the correct voltage displayed, press the ENTER
pushbutton to accept the correction factor number. Record the
correction factor number on the TSC 800 programming sheet for future
reference if required.
7.6.3.2.6. Repeat the above procedures for all remaining phases of the
generator supply as required.
NOTE:
Once the span calibration setting has been done,
do not readjust any zero calibration points as this
will cause incorrect voltage readings.
7.6.4. LOAD VOLTAGE CALIBRATION
To adjust the load voltage sensors, perform the following procedure:
7.6.4.1. ZERO CALIBRATION
7.6.4.1.1. Energize the utility supply but keep the transfer mechanism
in the neutral position (i.e. Load Bus De-energized.)
7.6.4.1.2. Scroll to the desired load supply voltage phases with the
ZERO function selected. NOTE: The phases being calibrated for zero
must have a true zero reference to ground to allow proper calibration. A
zero voltage reference will not likely be available if there are no
connected loads which result of a near 0 ohms resistance through to
ground (where step down sensing transformers are supplied with the
transfer switch the ground reference is provided by the these
transformers and no further actions are required). Where this ground
reference path does not exist a true zero may not be achievable, as the
load sensing inputs to the TSC 800 will be floating. If this ground path
does not exist the TSC 800 sensing inputs for the load bus must be
temporarily grounded to provide this true zero reference. It is
imperative, should this work be undertaken, it is only preformed by
qualified personnel and that the shorting leads be removed before re-
energizing the circuit. Failure to do so will result in catastrophic
equipment failure and possible personnel injury and/or death.
7.6.4.1.3. Use the INCREMENT or DECREMENT pushbuttons to
adjust the correction factor number while observing the displayed
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