Parameterization
SRW 01 | 5-45
5
It has a pre-alarm function informing that the motor thermal protection (P050) has passed the detection level
programmed in P646. It is only available if the motor thermal protection action is programmed for Trip (P641 = 1).
The pre-alarm indication is kept until an overload trip occurs, turning off the motor. It is removed if the motor
thermal protection level (P050) reaches the automatic reset level adjusted in P647, if the motor is turned off
before reaching 100 % of the motor thermal protection (P050), if a motor Trip occurs, or if a manual reset is
performed while the motor thermal protection (P050) is below the value adjusted in P646.
P646 – Overload Protection Pre-Alarm
Adjustable
Range:
0 to 99 %
Factory
Setting:
80 %
Proprieties:
Sys, rw
Description:
It defines the overload protection pre-alarm detection level. It is available only if the overload protection action is
set for Trip (P641 = 1). Setting P646 = 0 disables the pre-alarm function.
P647 – Overload Pre-Alarm Auto-Reset
Adjustable
Range:
0 to 99 %
Factory
Setting:
75 %
Proprieties:
Sys, rw
Description:
It defines the automatic reset actuation level of the overload protection pre-alarm. The auto-reset is only executed
if the relay is not in error or Trip. If P647 = 0, the auto-reset remains disabled.
t
Set
Reset
P647
P646
Trip (100%)
P050 (%)
0
Figure 5.22:
Overload protection pre-alarm auto-reset programming
NOTE!
The pre-alarm level programmed in P646 must be higher than the reset level adjusted in P647.
The overload protection has curves that simulate the heating up and the cooling down of the motor. All the
calculation is performed through sophisticated software that estimates the motor temperature using the True RMS
motor current supplied by the current measurement unit.
The motor thermal protection actuation curves are based on the IEC 60947-4-1 standard.
The motor heating up and cooling down curves are based in many years of development of WEG motors. The
thermal protection adopts the standard three-phase IP55 motor as a model and also takes into consideration if
the motor is cooling while being driven or not being driven.
The thermal image cooling time depends on the motor power, i.e., for each power there is a different cooling time.
Wherever there is the need to reduce this time, the parameter P642 can be used to define a fixed cooling time.
Содержание SRW 01
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Страница 8: ...Contents...
Страница 108: ...Parameterization 5 62 SRW 01 5...
Страница 128: ...Monitoring 6 20 SRW 01 6...
Страница 148: ...Technical Characteristics 8 12 SRW 01 8...