1 INTRODUCTION
g
GE Power Management
3
Communications and Control Features
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One latched, main trip relay
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One alarm relay
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Emergency restart capability
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Pre-trip alarm warnings
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4-20mA output of motor current as a percentage of full load, motor thermal capacity, hottest stator RTD
temperature, or percentage of phase CT secondary current
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Two auxiliary relays (169 Plus)
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Optional single-shot restart on running overload trip (169 Plus)
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Speed switch, differential relay, and spare input (169 Plus)
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RS 422 port for connection to programmable controllers and computers (169 Plus)
Statistical and Memory Features
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Recall of all pre-trip motor values
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Tamperproof setpoints stored in non-volatile memory
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Microcomputer "learns" motor inrush current, acceleration time
*
, cooldown rates
*
, and negative sequence
current heating K factor* (* 169 Plus only)
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Complete record of motor statistical data: motor running hours, number of starts, number and type of relay trips
(169 Plus)
1.3 Typical Applications
The many features of the 169 make it an ideal choice for a wide range of motor protection applications. Versatile
features and controls allow the relay to protect associated mechanical equipment as well as the motor. The 169
should be considered for the following and other typical uses:
1. Protection of motors and equipment from operator abuse.
2. Protection of personnel from shock hazards due to winding shorts or earth leakage current from moisture.
3. Protection of gears, pumps, fans, saw mills, cutters, and compressors from mechanical jam.
4. Indication of loss of suction for pumps or loss of air flow for fans using the undercurrent feature.
5. Protection of motor and load bearings from excessive heat buildup due to mechanical wear.
6. Protection of motors operated in environments with varying ambient temperatures.
7. Communication with programmable controllers and computers for integrated plant control.
8. Protection of high inertia, long acceleration drive systems using a custom overload curve.
9. Statistical record-keeping for effective maintenance programs.
10. Complete protection, allowing maximum motor utilization with minimum downtime, for all AC motors.
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