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Figure 4: Voltage Module
The two sense voltage inputs (Vref1 and Vref2; A, B, C, N) provide the phase voltages
(VAC) used for metering one or two different service types. Ref 1 could be used for
120V/208V 3ph 4wire, and Ref. 2 could be used for a 277V/480V 3 ph 4 wire service. Either
voltage reference can be assigned to any configured meter point, regardless of which CT
module or which CT inputs the meter point uses.
When the control voltage jumper is installed it connects Phase A from the Vref1 sense
voltage input to the Triacta GATEWAY device control voltage circuitry. This eliminates the
requirement for a separate voltage connection to the Auxiliary Control Voltage Input.
Separate control and sense voltage wiring is required when using the Triacta GATEWAY
with a Triacta PT Module, or when the meter is expected to be ON at all times - even when
the sense voltage source is OFF. I.E. the sense voltage is from an emergency power panel
that is not always ON.
Both the control voltage and sense voltage inputs will accept panel voltages from 120VAC to
277VAC. If the reference voltage for the circuit/s to be metered is larger than 277VAC,
external potential transformers (PTs) are required.
Figures 16 and 17 show typical installations with Triacta PT modules. Figures 18 and 19
show typical implementations with discrete external transformers.
Typically, external metering PTs are sized to convert from the panel’s line-to-line or line-to-
neutral voltages (ie 600VAC or 347VAC) down to 120VAC. The appropriate PT ratio (ie 5:1
or 2.89:1) must be programmed into the Triacta GATEWAY configuration as per the “Triacta
GATEWAY Flex Configuration Tool Guide” to provide correct meter readings.
WARNING The control Voltage Jumper must be removed if there is a separate
voltage source connected to the Auxiliary Control Voltage Input.
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