Functions, monitoring, and protective functions
9.5 Monitoring and protective functions
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
405
9.5.5
Thermal motor protection
Description
The priority of thermal motor protection is to identify critical situations. If alarm thresholds are
exceeded, the user can set parameterizable response options (p0610) that enable continued
operation (e.g. with reduced power) and prevent immediate shutdown.
The signal characteristic is shown in plan 902.
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Effective protection is also possible without a temperature sensor (p4100 = 0). The
temperatures of different motor components (stators, core, rotors) can be determined
indirectly using a temperature model.
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Connecting temperature sensors (KTY84 or PTC100 to the Customer Terminal Block
(TM31) terminal X522:7(+)/8(-)) allows the motor temperature to be determined directly.
In this way, accurate start temperatures are available immediately when the motor is
switched on again or after a power failure.
Temperature measurement via KTY
The device is connected to terminals X522:7 (anode) and X522:8 (cathode) on the Customer
Terminal Block in the forward direction of the diode. The measured temperature is limited to
between –48°C and +248°C and is made available for further evaluation.
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Set the KTY temperature sensor type: p4100 = 2
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Activate motor temperature measurement via the external sensor: p0600 = 10
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When the alarm threshold is reached (set via p0604; factory setting: 120°C), alarm A7910
is triggered.
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Parameter p0610 can be used to set how the drive responds to the alarm triggered:
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0: No response, only alarm, no reduction of I_max
–
1: Alarm with reduction of I_max and fault (F7011)
–
2: Alarm and fault (F7011), no reduction of I_max
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When the fault threshold is reached (set via p0605; factory setting: 155°C), fault F7011 is
triggered in conjunction with the setting in p0610.
Temperature measurement via PTC
The device is connected to terminal X522:7/8 on the Customer Terminal Block (TM31). The
threshold for switching to an alarm or fault is 1650 Ω. If the threshold is exceeded, the
system switches internally from an artificially-generated temperature value of –50°C to
+250°C and makes it available for further evaluation.
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Set the KTY temperature sensor type: p4100 = 1
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Activate motor temperature measurement via the external sensor: p0600 = 10
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Alarm A7910 is triggered once the PTC responds.
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Fault F7011 is triggered once the waiting time defined in p0606 has elapsed.
