3.2 MAXIMUM LOAD CONTROL
To
set the maximum load control, determine from the motor nameplate the full
load current and the service factor. e.g. 1.0,
1.15.
Set the maximum load current
control to the nameplate rating,
or
this value times the service factor. If the current
rises above this value
the
overload light will
come
on and the relay will
shutdown
the motor after a time determined by the run curve selected. degree
of
overload
and cumulative effect
of
previous overloads when the memory is active. Selection
of
the appropriate run curve
is
outlined in Section 3.8. As explained in Section 3.4
the run curve is not active during a startup.
FIGURE
3-2
RUN CURVES
TIME TO
TRIP
SECONDS
""f----ttll'--\-\1\..\.--+---+--+---+--+---+--l---t----l
,.,f----+.Jf.+\.\-1ri-''<-'<-+---+--+---+--+---+--l---t----l
'f----'------
'
t
MAX
LOAD
CONTROL
SETI
ING
i
17
'
OVERLOAD
FACTOR
'MULTIPLES
OF
MAX LOAD CONTROL)
Courtesy of NationalSwitchgear.com
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