WEG SRW 01, User Manual

Page: 86 / 148

Parameterization
5-40 | SRW 01
5
P630 – Frequency out of Range Protection Action
Adjustable
Range:
0 = Alarm
1 = Switch Off (Trip)
Factory
Setting:
1
Proprieties: Sys, rw
Description:
It defines the action of the frequency out of range protection.
5.7.9 Earth Leakage
The IEC 60755 technical report defines the terms “earth fault current” as the current that flows to the earth due to
an insulation fault; “earth leakage current” is the current that flows from the live parts of an installation to the earth
in the absence of insulation fault; and “residual current” is the vectorial sum of the instantaneous current values
flowing through the power circuit of the installation.
The SRW 01 has the protection function against earth leakage currents when used with the earth leakage sensors
(ELS). The protection action can be configured for alarm or trip. The sensors must be assembled separately from
the relay and placed at a maximum distance of ten meters from it. The earth leakage protection allows to detect
faults on the installation and/or electrical deterioration of equipment measuring residual currents between 300 mA
and 5 A. The time for the protection to actuate can also be configured from 0.1 s up to 99.0 s.
ATTENTION!
This earth leakage protection system has the sole purpose to protect installations.
It is not for the purpose of protecting people
.
It is expected for a fuse/circuit breaker, the upstream on the installation, with appropriate interruption capacity to
perform for residual currents with high magnitudes, supposedly indicating currents circulating on the main circuit
above the interruption capacity of the contactor. For this, the SRW 01 offers a function that inhibits the opening
of the relay when the residual current is larger than 10 A (for further information see the description of the function
on
Item 5.7.9.3 Trip Inhibition Function in Case of Short Circuit on page 5-42 ).
There are several situations during the start of electric induction motors that can indicate false presence of earth
leakage on the sensor. This effect is intrinsic of certain applications and, in most cases, temporary and lasts for a
short time. The SRW 01 has a function that inhibits the relay trip during the start of the motor and the inhibition time
of the trip can be configured by the user according to the configured application. This function allows reducing the
risks of nuisance trips (for further information see the description of the function on
Item 5.7.9.2 Inhibition of the
Earth Leakage Protection at Starting on page 5-41 ).
5.7.9.1 Earth Leakage Protection Operation
The SRW 01 offers a protection against earth leakage current on an installation (the earth leakage protection set
on parameter P631) whenever a fault occurs when the earth leakage sensor (ELS) detects that there is a residual
current larger than the current set on parameter P632 and the time is larger than that set on parameter P633. The
protection can be configured for alarm or trip through parameter P634. The factory standard for the earth leakage
protection is disabled.
NOTE!
If the Earth Leakage inhibition functions on the Start function (P635) or inhibition of the Trip in case
of short-circuit (P637) are abled, the SRW 01 will act according to the description of these functions.