2 Chapter 1 Introduction
Communications Connection (optional)
Connection to a printer, computer or central control room is enabled by
an RS-232/RS-422/RS-485 communications port that can operate at
baud rates of up to 9,600 bps. The RS-422/RS-485 port can operate in
multi-drop mode, permitting the connection of up to 32 instruments to a
single communications line. In the printer mode, the Powermeter
provides direct output of measurement parameters in printable format.
See Section 2.2.9 for pinouts and Appendix C for cable drawings.
Analog Output (optional)
One optional internal analog output is available for the following
measured values:
• Voltage (3-phase or line-to-line) • Active power
• Current (3-phase or line-to-line) • Apparent power
• Active power accumulated demand • Reactive power
• Power factor • Frequency
An external power supply (15-30VDC,24 VDC nominal) is required.
See Section 2.2.8 for connection.
If more than one analog output is desired, up to two AX-8 analog
expanders are available, providing up to 12 analog outputs. Contact
your distributor for purchasing AX-8 units.
Digital Input
One optically isolated digital input is provided for external
synchronization of power demand period. See Typical Installation on
page iv for connection.
Ground Leakage (Option L)
Option L provides ground leakage current measurements for
monitoring and alarm setting. A special ground leakage current
transformer (secondary current 5 mA) is required. See Section 2.2.10
for connection.
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