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2.4 Power Source Connection
The instrument can be operated from any single phase AC power source supplying
90-264 VAC 50/60 Hz, or from DC power supply 10-290 VDC. Power supply
options are available upon order.
For the power source wiring, see Figure 2-4. If an AC power supply is used, the live
line of the control power should be connected to terminal 1 and the neutral to
terminal 3. If a DC power supply is used, the positive supply wire should be
connected to terminal 1 and the negative wire to terminal 3.
F
The ground lug must be connected to the ground.
2.5 Voltage Input Connections
2.5.1 660V Input
Direct Connection
For some power systems, the 660V input option allows the user to use direct
connection without applying potential transformers (PT ). This will depend on the
power system configuration and on the system voltage level. In the case of systems
with line-to-line voltage up to 660V, direct connection may be used for 4-wire and
3-wire systems. Wiring diagrams for these are provided in Figures 2.5, 2.8, and 2.9.
F
To ensure accurate readings, the measured voltage between terminals
2-11, 5-11 and 8-11 should not exceed RMS value 550 VAC and
amplitude value 900V.
NOTE
When direct connection without potential transformers is used, set the PT RATIO in the
instrument to 1.
Using Potential Transformers
For high voltage applications (above 660V line-to-line voltage) potential
transformers (PT) must be used to scale down the input voltage to rated input scale
of the instrument. The instrument is intended to be wired via potential transformers
with secondary line-to-line voltage up to 120V + 20%. The instrument supports 3-
wire open delta systems and 4-wire Wye systems. Wiring diagrams for these are
provided in Figures 2-6, 2-7, 2-10 and 2-11.
Installation
15
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