5.10.1. SYSTEM PHASES
Set to match the power distribution system used on the automatic transfer switch (i.e.
either single phase or 3 phase system).
5.10.2. SYSTEM VOLTAGE
Set to nominal system voltage as expressed in “phase to phase” voltage. (E.g. A
347/600-volt system would be entered as “600”.) A drop down list of common voltages
appears when the blue underlined value is selected. Refer to Section 2.4 for a listing of
available AC system voltage sensing configurations possible with a TSC 900.
5.10.3. SYSTEM FREQUENCY
Set to nominal system frequency of either 50Hz or 60Hz.
5.10.4. PHASE ROTATION REVERSED
The Transfer switch is configured from the factory to operate on a normal A-B-C
(Positive) phase rotating system (i.e. Option Feature set for “NO”). This allows for correct
operation of voltage sensing and power metering option (if equipped) utilizing the TSC
900’s internal symmetrical component algorithms (i.e. positive/negative/zero sequence
components). If the system is to operate on a C-B-A (Reverse) phase rotating system,
set this feature to “YES”. Note: Automatic transfers between sources will be halted (i.e.
blocked) if both source phase rotations are not matched. Refer to Section 4.13 for further
operating information on Transfer Halt conditions.
5.10.5. RATED GENERATOR POWER
Set to match the 100% power rating of the connected Generator set in kilowatts. This
setting is utilized for the kW Load Shed set point calculations.
5.10.6. CT RATIO (CURRENT TRANSFORMER)
When load bus current transformers (CTs) are utilized in the ATS, set to value of the
specific ratio of the CT size being used (e.g. If using 400:5 rated CT’s, enter a value of
80).
5.10.7. PT RATIO (POTENTIAL TRANSFORMER)
For direct voltage sensing wiring connections from 208 to 600 volts, enter a value of
“1.0”. When potential transformers are utilized for voltage sensing, enter the transformer
ratio. (E.g. When using 600:120 potential transformers, enter a value of “5.0”). The ratio
is programmable in tenths to allow minor correction factors to be used for non-standard
potential transformer ratios.
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