Rockwell-automation 592- E300 Overload Relay User Manual Uživatelský manuál Strana 178

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178 Rockwell Automation Publication 193-UM015B-EN-P - June 2014
Chapter 5 Protective Trip and Warning Functions
Bit 1 in Device Status 0 (Parameter 20) will set to 1
Any relay outputs configured as a Warning Alarm will close
Under kVA Warn Level
Under kVA Warn Level (Parameter 405) 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 176 - Under kVA Warn Level (Parameter 405)
Over kVA Trip
The E300 Electronic Overload Relay will trip with an Over kVA indication if:
No trip currently exists
Over kVA Trip is enabled
Current is present
Voltage is present
Over kVA Inhibit Time has expired
The total apparent power (kVA) is greater than the Over kVA Trip Level
f
o
r a time period greater than the Over kVA Trip Delay.
If the E300 Electronic Overload Relay trips on an over apparent power (kVA),
the:
TR
IP/WARN LED status indicator will flash a red 2-long / 8-short blink
pa
ttern
Bit
7 in Power Trip Status (Parameter 6) 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
Any relay outputs configured as a Trip Alarm will close
Any relay outputs configured as a Normal Relay will be placed in their
Pr
otection Fault state (if so programmed)
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 Under kVA Warning function does not include a time delay feature. Once
the Under kVA Inhibit Time has expired, the Under kVA Warning indication is
instantaneous.
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