3 Installation
3.6 Electrical Installation
DC1 Variable Frequency Drive
04/16 MN04020003Z-EN
www.eaton.com
95
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 60: 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 k
Ω
, while the reset range must fall within a range of 1.9 - 1 k
Ω
.
T1
T2
M 3 ∼
Thermoclick sensor
ϑ
ϑ
U
V
W
PE
PTC type
≧ 2.5 kΩ trip level
≦ 1.9 kΩ Reset
PES
1 2 3 4 5 6 7 8 9 10 11
