7
Overload protections
-_
7.1
Overload protection of the frequency
controller
(Lt
monitoring)
The frequency
controllers
have an output current monitoring to
protect
them against overload. You
tan
adapt this protection to the
maximum ambient temperature to be expected. The lower the max.
ambient temperature, the
higher
the limit of the permissible
continuous output current. The permissible continuous output
powes rises the same way.
Under
Cl 19 and Cl20 you
tan
enter
three settings:
l Rated power up to a maximum of 50°C
l Increased power up to a maximum of 45°C
l Maximum power up to a maximum of 40°C
(cannot
be activated
when using the units 8605, 8607, 8611, 8615)
If
the output current exceeds the set limit, a fault is indicated after
30 to 60 seconds (see page 148).
7.2
Overload protection of the motor
For motor protection, you
tan
use the
controller’s
PTC input
(Xl
/
terminals 11, 12).
You
tan
use the input to connect a PTC thermistor or a thermal
contact. The motor monitoring is already activated by connecting
the monitoring circuit of the motor to terminals 11 and 12 (remove
wire bridge).
If the motor is overheated, you
tan
program
the monitoring of the
PTC input such that
l no
indication
is released
l TRIP is activated, see page 148
l a warning is indicated, see page 150
Select the TRIP set-input by
entering
Cl 19 =
-O-
and
program
the
function
via
Cl20
(see page 82).
Code
t
Name
Parameter (Factoty setting
is
printed in
bold)
Acceptance
C11!3
PreselecBon:
-O-
Digital input
TRIP-Set
SH + PRG
Monitoring
-l-
PTC
input
-15
Output power
(1
t
monitoring)
LmKe
99
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