Rockwell Automation Publication 193-UM015D-EN-P - February 2015
187
Protective Trip and Warning Functions
Chapter 6
Under Voltage Protection
Electric motors consume more electric current when the voltage supplied to the
motor is lower than the motor nameplate rating. This can damage to an electric
motor over an extended period of time. The E300 Electronic Overload Relay can
monitor for this condition with its Under Voltage Trip and Warning function to
detect for low voltage levels to minimize motor damage and loss of production.
Under Voltage Inhibit Time
Under Voltage Inhibit Time (Parameter 355) allows you to inhibit an under
voltage trip and warning from occurring during the motor starting sequence. It is
adjustable from 0…250 seconds.
Table 226 - Under Voltage Inhibit Time (Parameter 355)
Under Voltage Trip
The E300 Electronic Overload Relay trips with an undervoltage indication if:
•
No trip currently exists
•
Under Voltage Trip is enabled
•
Voltage is present
•
Under Voltage Inhibit Time has expired
•
The minimum phase voltage is less than the Under Voltage Trip Level for a
time period greater than the Under Voltage Trip Delay.
If the E300 Electronic Overload Relay trips on an under voltage, the:
•
TRIP/WARN LED status indicator flashes a red 1-long / 1-short blink
pattern
•
Bit 0 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
•
Any relay outputs configured as a Normal Relay are placed in their
Protection Fault state (if so programmed)
Default Value
10
Minimum Value
0
Maximum Value
250
Parameter Type
USINT
Size (Bytes)
1
Scaling Factor
1
Units
Seconds
Summary of Contents for Allen-Bradley E300
Page 1: ...E300 Electronic Overload Relay Bul 193 592 User Manual...
Page 128: ...128 Rockwell Automation Publication 193 UM015D EN P February 2015 Chapter 5 Operating Modes...
Page 304: ...304 Rockwell Automation Publication 193 UM015D EN P February 2015 Chapter 7 Commands Notes...
Page 502: ...502 Rockwell Automation Publication193 UM015D EN P November 2013 Appendix B Parameter List...
Page 545: ......