Introduction 1
1. Introduction
1.1 About The PM295
The PM295 is an advanced microprocessor-based digital instrument that
incorporates the capabilities of the network analyzer, data recorder and
programmable controller allowing for user network monitoring, analysis and control.
The instrument provides three-phase measurements of electrical quantities in power
distribution systems, monitoring external events, operating external equipment via
relay contacts, fast and long-term on-board recording of measured quantities and
events, harmonic network analysis and disturbance recording.
The PM295 can communicate with PLCs and PC based workstations via serial
communications and directly by transducing analog and discrete signals, serving as
excellent partner in power network management. All measurement functions of the
PM295 are remotely programmable via the communications port.
The accompanying PAS295 software package provides easy remote programming
for the instrument, data acquisition, analysis and on-screen presentation.
1.2 Instrument Features Summary
Processing Block
• CPU - microcontroller 80C196KC20 with a 20 MHz oscillator
• Extended nonvolatile RAM with battery backup for data recording - 512K byte
module
• On-board real-time clock
• A I0-bit A/D converter
• Power supervisory circuit
• External watch-dog
Analog Inputs
• 3 isolated voltage inputs - 660 VAC/120 VAC options
• 3 isolated current inputs - 1A or 5A secondary options
• 1 isolated auxiliary current input for ground leakage/neutral current
measurements - 5 mA/1A/5A secondary options (upon order)
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