Lenze 8615E - Manual (Page 99)

97
7 Overload protections
7.1 Overload protection of the frequency inverter
(I
⋅
t monitoring)
The frequency inverters have an output current monitoring to
protect them against overload. You can 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
power rises the same way. Under C119 and C120 you can enter
three settings:
•
Rated power up to a maximum of 50°C
•
Increased power up to a maximum of 45°C
•
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 117).
Code Parameter Meaning Acceptance
C119 -15-
... Output current monitoring
˝Other protections SH + PRG
C120 -0-
-1-
-2- Rated power up to 50°C
Increased power up to 45°C
Maximum power up to 40°C SH + PRG
7.2 Overload protection of the motor
For motor protection, you can use the inverter´s PTC input and the
I
² ⋅
t monitoring.
7.2.1 PTC input
The inverter has an input for PTC thermistors according to DIN
44081 and DIN 44082. You can 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 can program the monitoring of the
PTC input such that
•
no indication is released
•
TRIP is activated, see page 117
•
a warning is indicated, see page 119
Select the TRIP set-input by entering C119 = -0- and program the
function via C120 (see page 79).
Code Parameter Meaning Acceptance
C119 -1-
... PTC input
other protections SH + PRG
C120 -0-
-1-
-2- Monitoring is not active
Monitoring is active, TRIP
Monitoring is active, warning SH + PRG