Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 138)

138 Rockwell Automation Publication 193-UM015B-EN-P - June 2014
Chapter 5 Protective Trip and Warning Functions
Over Voltage Protection
The winding insulation for electric motors will degrade faster when more voltage
is supplied to the motor than the motor name plate rating. This could cause
damage to an electric motor over an extended period of time. The E300
Electronic Overload 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 the installer 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 Electronic Overload Relay will trip 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 time period greater than the Over Voltage Trip Delay.
If the E300 Electronic Overload Relay trips on an over voltage, the:
• TRIP/WARN LED status indicator will flash a red 1-long / 2-short blink
pattern
• Bit 1 in Voltage Trip Status (Parameter 5) will set to 1
• Bit 0 in Device Status 0 (Parameter 20) will set to 1
• Any relay outputs configured as a Trip Relay will open
• Any relay outputs configured as a Control Relay will open
IMPORTANT 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 Sec