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PTC: Thermistor input
Terminal function
When the programmable digital input 5 is configured as PTC, motor temperature can be monitored when a
thermistor with a positive temperature coefficient is connected to terminals 5 and L. When the thermistor
resistance rises to above 3000 Ohms (+/-10%), operation of the motor is stopped and the trip is E 35
displayed.
Configuration
C 05
Configure digital input 5 as PTC input by entering the parameter 19 under C 05.
Remarks
• Only digital input 5 can be used for connecting a PTC thermistor, the digital inputs 1 through 4 can not be
used for this purpose.
• If digital input 5 has been configured as PTC without a thermistor being connected to input 5, trip E 35
will be displayed.
• The PTC input is always a normally open contact and can not be configured a normally closed contact.
SFT: Software lock
Terminal function
When a digital input configured as SFT is activated, then the configured parameters can not be overwritten
by mistake.
Configuration
b 31
C 01 – C 05
1) First b 31 must be configured to determine if the software lock should also include the frequency setting
(set parameter to 00) or not (set parameter to 01).
2) Configure one of the digital inputs 1 – 5 as SFT input by entering the parameter 15 under C 01 – C 05.
Remarks
• There is a second alternative way to activate a software lock which does not even use a digital input. For
this, the parameter 02 or 03 must be set under b 31 depending if the software lock will also include the
parameter set under F 01 or not.
Chapter 7 – Control circuit terminal functions
L
5
4
3
2
1
P24
°C
Thermistor
5
4
3
2
1 P24
7-12
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