Lenze E94AxPExxxx - Manual (Page 272)

6 Motor interface
6.9 Monitoring
272
Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
6.9.3.2 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 X106/T1 and X106/T2.
• The monitoring responds from a resistance value of 1.6 kΩ at connections X106/T1 and X106/
T2, see functional test below.
• If the monitoring responds:
• The error response set in C00585 is activated (Lenze setting: "No response").
• the error message "PTC has triggered" (0x0077000f) is entered into the logbook of the
controller.
• the status output MI_bMotorOverloadWarning is set to TRUE.

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 : The fault message must be triggered.
• R < 1 kΩ : The fault message must not be triggered.

Stop!
• This monitoring is only active if the controller is supplied via the line side, i.e. if
the DC-bus voltage (U
z
) > undervoltage threshold (LU).
• The controller can only evaluate one PTC thermistor!
Do not connect several PTC thermistors in series or parallel.
• If several motors are operated on one controller, use thermal contacts (NC contacts)
connected in series.
• To achieve full motor protection, an additional temperature monitoring with separate
evaluation must be installed.

Note!
• In the Lenze setting ( C00585 = "0: No response"), motor temperature monitoring is
deactivated!
• Lenze three-phase AC motors are provided with a thermal contact on delivery.