TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 9 06/04/24 Thomson Technology
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7.6.2.2.6. Repeat the above procedures for all remaining phases of
the utility 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.
7.6.3. GENERATOR VOLTAGE CALIBRATION
To adjust the generator supply voltage sensors, perform the following procedure:
7.6.3.1. ZERO CALIBRATION
7.6.3.1.1. Energize the utility supply to power up the controller and
de-energize the generator supply.
7.6.3.1.2. Scroll to the desired generator 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 should be achieved as a result of
a near 0 ohms resistance through the source supply windings through
to the neutral star point connection which in turn is solidly bonded to the
building ground at one point in the system (where both the step down
sensing and power supply 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 voltage reference may not be achievable
(upstream breaker ahead of the TSC 800 is open with respect to the
generator set alternator windings), as this leaves the sensing inputs to
the TSC 800 floating. Simply closing the local generator breaker will
generally provide the zero voltage reference required. If this is not
possible the TSC 800 sensing inputs for the generator must be
temporarily grounded to provide this true zero reference. It is
imperative, should this work be undertaken, it only is 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.
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