Rockwell-automation 592- E300 Overload Relay User Manual Instrukcja Użytkownika Pobierz pdf (Strona 180)

180 Rockwell Automation Publication 193-UM015B-EN-P - June 2014

Chapter 5 Protective Trip and Warning Functions

Table 178 - Over kVA Trip Level (Parameter 408)

Over kVA Warning

The E300 Electronic Overload Relay will indicate an Over kVA warning if:

• No warning currently exists

• Over kVA Warning is enabled

• Current is present

• Voltage is present

• Over kVA Inhibit Time has expired

• The total apparent power (kVA) is equal to or greater than the Over kVA

n i ng Le ve l

When the Over kVA Warning conditions are satisfied, the:

• TRIP/WARN LED will flash a yellow 2-long / 8-short blink pattern

• Bit 7 in Power Warning Status (Parameter 12) will set to 1

• Bit 1 in Device Status 0 (Parameter 20) will set to 1

• Any relay outputs configured as a Warning Alarm will close

Over kVA Warn Level

Over kVA Warn Level (Parameter 409) allows the user to define the apparent

power (kVA) at which the E300 Electronic Overload Relay will indicate a

warning. It is user-adjustable from 0…2,000,000 kVA.

Table 179 - Over kVA Warn Level (Parameter 409)

Default Value 0.000

Minimum Value 0.000

Maximum Value 2,000,000.000

Parameter Type DINT

Size (Bytes) 4

Scaling Factor 1000

Units kVA

IMPORTANT

The Over kVA Inhibit Time starts after a phase voltage transitions from 0V to

20V L-L and a phase of load current transitions from 0A to 30% of the device’s

minimum FLA setting. The E300 Electronic Overload Relay does not begin

monitoring for an over apparent power (kVA) condition until the Over kVA

Inhibit Time expires.