TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 10 08/09/25 Thomson Technology
62
Displays the actual voltage measurement, which will be the same value as
shown on the TSC 800 display menus for generator or utility supplies. This
voltage reading may be calibrated higher or lower by changing the correction
factor number and compared to a meter of known calibration to be within
0.5% or better and adjusted to match.
NOTE:
To accurately calibrate the TSC 800’s voltage
sensors, an external test voltage meter is
required, with an accuracy of 0.5% or better.
7.6.2. UTILITY VOLTAGE CALIBRATION
To adjust the utility supply voltage sensors, perform the following procedure:
7.6.2.1. ZERO CALIBRATION
7.6.2.1.1. Energize the generator supply to power up the controller and
de-energize the utility supply.
7.6.2.1.2. Scroll to the desired utility 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 open in respect to the building utility supply
transformer) as this leaves the sensing inputs to the TSC 800 floating.
In cases such as this the TSC 800 sensing inputs for the Utility supply
must temporarily be 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.
To Next Page
Loading...
