3 Installation
3.6 Electrical Installation
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives 05/21 MN040058EN www.eaton.com 83
3.6.3 Thermistor connection
Motor thermistors and motor thermal switches (Thermoclick) can be
connected to control signal terminal 4 (DI3 = digital input 3) in order to
provide protection against thermal motor overloads.
In this case, parameter P-15 must be used to select the EXTFLT
(external fault) setting for DI3, and parameter P-47 must be set to a value of
6 (Ptc-th).
Figure 56: Thermistor connection
The thermistors and thermal switches used must be PTC-type units (PTC
characteristic, positive temperature coefficient).
The tripping range must fall within a resistance value range of approximately
2.5 - 3 kΩ, while the reset range must fall within a range of 1.9 - 1 kΩ.
T1 T2
M3∼
Thermoclick sensor
ϑ
ϑ
UVWPE
PTC type
≧ 2.5 kΩ trip level
≦ 1.9 kΩ Reset
PES
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