369 Motor Protection System

• Enhanced Thermal Model including RTD and Current Unbalance Biasing

• Complete Asset monitoring with programmable RTD inputs for Stator, Bearing and Ambient temperature protection

• Enhanced reporting - Motor Health Reports provide critical information for preventative maintenance

• Reduce troubleshooting time and maintenance costs

-Event reports, waveform capture, motor start data logger

• Multiple communication protocols - Modbus RTU, Profibus, DeviceNet, Modbus TCP/IP

• Simplified programming with the EnerVistaTM 369 Motor Settings Auto-Configurator

• Optional Conformal coating for exposure to chemically

corrosive or humid environments (option)

• Field upgradable settings and firmware

• Suitable for hazardous locations - UL certification for Class 1 Division 2 applications (option MOD502)

• Installation flexibility - Remote display and remote RTD options

• Safe and reliable motor re-start on “Down Hole” pump applications - Unique back spin detection feature detects flow reversal on a pump motor, enabling timely and safe motor restarting

• User definable parameters and data size for DeviceNet polling

• User definable parameters and data size for Profibus DPV1 cyclic data

• Motor learned data on historical start characteristics

Unbalance (Negative Sequence Current) Biasing

Negative sequence current, which causes rotor heating, is not accounted for in the thermal limit curves supplied by the motor manufacturer. The 369 relay can be programmed to calculate the negative sequence current, and bias the thermal model to reflect the additional heating.

RTD Biasing (Relay Option R)

The thermal overload curves are based solely on measured current, assuming a normal 40°C ambient and normal motor cooling. If the motor cooling systems fail, or if the ambient temperature is unusually high, standard overload protection will not detect the increase in temperature.

When ordered with the RTD option, the 369 can monitor the actual motor temperature, and calculate the Thermal Capacity Used (TCU) based on the RTD Bias curve. This TCU value will then be compared with the TCU determined by the overload curve. The higher of the two values will be used.

For RTD temperatures below the RTD BIAS MINIMUM setting, no biasing occurs. For maximum stator RTD temperatures above the RTD BIAS MAXIMUM setting, the thermal memory is fully biased and forced to 100%.

Cool Time Constants

The 369 has a true exponential cooldown characteristic which mimics actual motor cooling rates, provided that motor cooling time constants are available for both the stopped and running cases. when ordered with the RTD option, the stopped and running cool time constants will can be calculated by the 369 based on the cooling rate of the hottest stator RTD, the hot/cold stall ratio, the ambient temperature (40 ° C if no ambient RTD), the measured motor load and the programmed service factor or overload pickup.

Start Inhibit

The Start Inhibit function prevents starting of a motor when insufficient thermal capacity is available or a motor start supervision function dictates the start inhibit.

Undercurrent (Minimum Load)

The undercurrent function is used to detect a decrease in motor current caused by a decrease in motor load. This is especially useful for indication of conditions such as loss of suction for pumps, loss of airflow for fans, or a broken belt for conveyors. A separate undercurrent alarm level may be set to provide early warning.

Ground Overcurrent

For zero sequence ground overcurrent

protection, all three of the motor

conductors must pass through a separate ground CT. CTs may be selected to detect either high-impedance zero sequence

comground or residual ground currents. The ground fault trip can be instantaneous or time delayed by up to 255 seconds. A low level of ground fault pickup is desirable to protect as much of the stator winding as possible. A 50:0.025 A CT, 1 A or 5 A CT may be used for ground fault detection.

Rapid Trip/Mechanical Jam

During Overload conditions, quick motor shut down can reduce damage to gears, bearings, and other mechanical parts associated with the drive combination. The Mechanical Jam protection will operate for currents above a user-programmable pickup level.

Motor Health Report

This reporting function is included

with every 369 relay, providing critical

information on the historical operating

characteristics of your motor during motor

starting and stopping operations. Included

in the report are:

• Motor operation historical timeline,

displaying start, emergency restart,

stop, trip, and alarm operations.

• Historical record of motor trips

• Extensive trending of motor learned

information (trending information up

to a maximum of 1250 motor start

operations)

• High Speed motor start data logger

trends, including current, current

unbalance, voltage, frequency, TCU and

breaker contact status during start

Viewpoint Maintenance

Viewpoint Maintenance provides tools

that will increase the security of your 369,

create reports on the operating status

of the relay, and simplify the steps to

troubleshoot protected motors.

Tools available in Viewpoint Maintenance

include:

• Settings Audit Trail Report

• Device Health Report