Phoenix Contact 1201132, User Manual

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Description of parameter settings
109908_en_00 PHOENIX CONTACT
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10.5.9 PTC
A PTC thermistor on the motor can be connected to the CONTACTRON Speed Starter. This
is especially recommended when the device controls the motor with low frequencies. The
motor will heat up quicker because the speed is slower and the air flow is smaller. The
thermistor detects the temperature of the motor and sends out a warning and error signal as
shown below. Connect the thermistor output signal to the CONTACTRON Speed Starter at
the input terminals TH1 and TH2.
Protection level is shown as below:
1. PTC input voltage >9.99 V, short failure
2. PTC input voltage ≥ 9.25 V, normal operation
3. PTC input voltage ≤ 8.74 V, overheat warning
4. PTC input voltage ≤ 8.43 V, overheat error
5. PTC input voltage ≤ 2.5 V, open loop
NOTE:
The CONTACTRON Speed Starter is made according to the Standard IEC/EN 61800-5-
1. This means that a reinforced isolation between the power circuit and the lower voltage
is needed. Therefore the thermistor in the motor needs a reinforced isolation in order to not
weaken the complete isolation system of the application.
Alternatively, an external signal conditioner can be used between the CONTACTRON
Speed Starter and the thermistor of the motor. In this case a signal conditioner with the
overvoltage category 3 needs to be used.
Can be set during
operation
Leading alphabet Parameter
name
Setting range Factory
default

9. PTC - PTC active PTC No: disabled
Yes: enabled
No