8400 StateLine C | Reference manual
Motor control (MCTRL)
Monitoring
236 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
5.12.3 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 X106/T1 and X106/T2.
If 1.6 kΩ < R < 4 kΩ at the terminals X106/T1 and X106/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) tripped
" error message is entered into the
Logbook.
–The bMctrlMotorPtc status output of the LS_DeviceMonitor
system block is set to
TRUE.
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.
• 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 = "1: Fault"), motor temperature monitoring is
activated!
• There is a wire jumper between the terminals X106/T1 and X106/T2 by
default.
• Lenze three-phase AC motors are provided with a thermal contact on
delivery.
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