TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 9 06/04/24 Thomson Technology
65
7.6.2.1.6.
7.6.2.2. SPAN CALIBRATION
7.6.2.2.1. Energize the utility supply voltage to the controller at nominal
level. The generator supply may be de-energized.
7.6.2.2.2. In the programming mode, scroll to the desired utility supply
voltage phases with the SPAN function selected (do not adjust the Zero
calibration function with voltage applied as this will result in non-linear
voltage readings).
7.6.2.2.3. Connect an external AC voltmeter of adequate voltage range
and accuracy to the TSC 800 controller terminal associated with the
voltage phases to be calibrated.
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 personal injury and/or death.
7.6.2.2.4. Use the INCREMENT or DECREMENT pushbuttons to
adjust the correction factor number while observing the displayed
voltage level on the TSC 800. Adjust the correction factor number to
obtain an identical voltage reading as measured with the external AC
voltmeter. To attain the highest degree of calibration accuracy for the
Span, adjust the correction factor to attain a TSC 800 voltage value of 1
volt above and 1 volt below the actual value, in each case note the
correction factor number required to attain these values, select the
correction number mid point between these two values and apply this
value.
7.6.2.2.5. 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.
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