GE Industrial Solutions POWER LEADER PMCS Network Architecture Guide - Manual (Page 68)

Power Management Control System
Appendix A — IED Descriptions
58
• Event recorder
• Waveform capture
• Data logger
RS-485 Repeater
Repeaters extend the range of an RS-485 network. The
following commercially available RS-485 repeater is
recommended for use with the PMCS, in accordance
with the configuration rules explained in Chapter 2.
Manufacturer Description
OPTO 22 AC38 RS-485 Isolated Multidrop
Repeater
369 Motor Management Relay
The 369 is a digital relay that provides protection and
monitoring for three phase motors and their associated
mechanical systems. A unique feature of the 369 is its
ability to "learn" individual motor parameters and to
adapt itself to each application. Values such as motor
inrush current, cooling rates, and acceleration time may
be used to improve the 369's protective capabilities.
369 offers the following features:
• AC/DC control power
• Flash memory
• Simulation mode for field testing
• Trip/Alarm/Aux1/Aux2 Relay Outputs
• Optional split mounting
• Optional remote RTD module
Spectra Electronic Control Module (ECM)
The Spectra RMS Electronic Control Module (ECM) is
a microprocessor-based IED that functions as an
adjustable overload relay to protect motor starters in GE
8000 Line Motor Control Centers. It works in series with
a Spectra RMS Mag-Break
® Motor Circuit Protector and
a contactor.
The ECM provides the following functions:
• Electronic overload protection in coordination
with Motor Circuit Protector
• User-selectable current phase-loss protection
• User-selectable phase-unbalance protection
• User-selectable equipment ground-fault
protection
• Control voltage/undervoltage contactor coil
• Current metering (via commnet)
• Full-load amps adjustment of 33–100% of
breaker rating plug value
• NEC Relay Class 10/20/30 selection
• Contact for monitoring trip status
SR469 Motor Management Relay
The SR469 Motor Management Relay is intended for
protection and management of medium- and large-
horsepower motors and driven equipment. Motor
protection, fault diagnostics, power metering, and
communication functions have been integrated into
one complete, economical draw-out package.
The SR469 has integrated every protection feature that
could be considered a benchmark for medium- and
large-motor protection. This high degree of integration
allows for standardization on one motor-protection
relay regardless of application.
The heart of the SR469 is the thermal model. In
addition to the current-protection elements, RTD
inputs are provided for stator- and bearing-temperature
protection. The addition of VT inputs allows for
voltage- and power-protection elements. Phase-
differential CT inputs are provided for phase-
differential protection. All of the protection elements
are self-contained and may be enabled as required. This
design makes programming the SR469 a simple
exercise.
The SR469 has complete monitoring and metering
functions. An event recorder stores 40 time- and date-
stamped records. Waveform capture of 16 cycles allows
for setting the number of pre-trip and post-trip cycles
recorded. The SR469 learns the acceleration time,
starting current, and thermal capacity required during
motor starts. If motor load during starting is relatively
consistent, these learned values may be used to fine-
tune the acceleration protection. The SR469 can also
learn the average motor load over a period of time.
The relay has compete local and remote user interface
capabilities. A forty-character display, keypad, and LED
indicators provide local communication. A front-panel
RS-232 port provides convenient computer access. Two
rear-panel RS-485 ports are provided for remote
communication.
Applications
• Medium and large motors
• Driven equipment
• Motors with high inertial loads