370 Rockwell Automation Publication 193-UM015E-EN-P - October 2015
Chapter 6 Protective Trip and Warning Functions
Overvoltage Protection
The winding insulation for electric motors degrades faster when more voltage is
supplied to the motor than the motor nameplate rating. This can damage to an
electric motor over an extended period of time. The E300 relay can monitor for
this condition with its Over Voltage Trip and Warning function to detect for
high voltage levels to minimize motor damage and loss of production.
Over Voltage Inhibit Time
Over Voltage Inhibit Time (Parameter 359) allows you to inhibit an over voltage
trip and warning from occurring during the motor starting sequence. It is
adjustable from 0…250 seconds.
Over Voltage Trip
The E300 relay trips with an Over Voltage indication if:
• No trip currently exists
• Over Voltage Trip is enabled
• Voltage is present
• Over Voltage Inhibit Time has expired
• The minimum phase voltage is greater than the Over Voltage Trip Level
for
a t
ime period greater than the Over Voltage Trip Delay.
If the E300 relay trips on an over voltage, the:
• TRIP/WARN LED status indicator flashes a red 1-long / 2-short blink
patter
n
• Bit
1 in Voltage Trip Status (Parameter 5) sets to 1
• Bit 0 in Device Status 0 (Parameter 20) sets to 1
• Any relay outputs configured as a Trip Relay open
• Any relay outputs configured as a Control Relay open
• Any relay outputs configured as a Trip Alarm close
The Under Voltage Warning function does not include a time delay feature.
Once the Under Voltage Inhibit Time has expired, the Under Voltage Warning
indication is instantaneous.
Default Value 10.0
Minimum Value 0.0
Maximum Value 250.0
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 11
Units Seconds
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