Lenze 8400 motec - Manual (Page 176)

5 Motor control (MCTRL)
5.14 Monitoring
176 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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5.14.3 Motor temperature monitoring (PTC)
For detecting and monitoring of the motor temperature, a PTC thermistor (DIN 44081/DIN 44082)
or a thermal contact (NC contact) can be connected to the terminals T1 and T2.
• If 1.6 kΩ < R < 4 kΩ at the terminals T1 and T2, the monitoring will respond, see functional test
below.
• If the monitoring responds:
• The error response set in C00585 is activated (Lenze setting: "Fault").
• The " OH3: Motor temperature (X106) triggered " error message is entered into the Logbook.
• A setting of C00585 = "0: No Reaction" deactivates the monitoring.

Tip!
We recommend to always activate the PTC input when using motors which are equipped
with PTC thermistors or thermostats. This prevents the motor from being destroyed by
overheating.
Functional test
Connect a fixed resistor to the PTC input:
• R > 4 kΩ : Fault message must be activated.
• R < 1 kΩ : Fault message must not be activated.

Stop!
• The controller can only evaluate one PTC thermistor!
Do not connect several PTC thermistors in series or parallel.
• To achieve full motor protection, an additional temperature monitoring with separate
evaluation must be installed.

Note!
• In the Lenze setting ( C00585 = "1: Fault"), motor temperature monitoring is activated!
• Lenze three-phase AC motors are provided with a thermal contact on delivery.