Thermal motor monitoring
Temperature monitoring of the motor with PTC and earth-fault detection
10
Function library
10.14
10.14.2
L
10.14-3
EDS82EV903-1.0-11/2002
l
To prevent motors with forced ventilation from starting too early, this
function can be deactivated.
l The current limits C0022 and C0023 only have indirect influence on the I
2
t
calculation. It is possible to prevent motor operation with a maximum of
possible load with settings under C0022 and C0023.
)
))
) Note!
If the controller operates at increased rated power, the I
2
t
monitoring starts if C0120 is set lower than 100 %.
10.14.2 Temperature monitoring of the motor with PTC and earth-fault detection
You can connect PTC resistors via the inputs X2/T1 and X2/T2 according to DIN
44081 and DIN44082. The motor temperature is detected and integrated into the
drive monitoring.
It is also possible to connect a thermostat (NCcontact)to X2/T1and X2/T2.Lenze
AC three-phase motors are equipped with these components as standard.
We recommend to always activate the PTC input for operation with motors
equipped with PTC resistors or thermostats. By this you prevent the motor from
overheating.
(
((
( Stop!
l The controller can only detect one PTC resistor! Do not
connect several PTC resistors in series or in parallel:
– The motor temperature would be measured incorrectly.
– The motors could be destroyed by overheating.
l If you connect several motors to one controller, use
thermostats (NC contacts) connected in parallel to monitor the
motor temperature.
l To achieve a total motor protection you must install an
additional temperature monitoring with a separate evaluation.
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