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Programming 75
Function: Motor Temperature
Setting: E
In addition to or in place of the OL1 (Motor Overload) fault of the Drive, it is possible to use a PTC (Positive Temperature
Coefficient) thermistor for motor insulation protection. The PTC thermistors are built into the windings of some motors and
will vary their resistance based on temperature. An example PTC characteristic is show below.
Fig. 56 PTC Thermistor Temperature-Resistance Value Characteristics
Connection of the thermistor to the Drive is shown below, in addition make sure Dip Switch S1-2 is in the OFF position, see
Figure 52.
Fig. 57 Thermistor To Drive Connection Diagram
After the connections are made, configure the A2 analog input for motor temperature protection by setting H3-09= “E: Motor
Temperature”. Parameters L1-03, L1-04, and L1-05 set the response to the alarm level being exceeded, response to the fault
level being exceeded, and temperature sensing delay time, respectively.
Tr: Temperature threshold value
Tr
Tr+5
Tr
Tr 5
550
1330
Resistance (ohms)
Class F
150
Class H
180
Temperature
+V
(+15 V, 20 mA)
A2
(0-10 Vdc)
AC
PTC Thermistor
Branch resistance
18 k
Ω
*1
*1 The resistance value of 18 k
Ω
is only valid for
using a 3-phase PTC with the characteristics shown in
the figure below.
above.
(
R
ptc@Tr
x3) x (
V
S
-V
ptc@OH
3
)
V
ptc@OH
3
Rbranch
=
Содержание E7U
Страница 1: ...E7 Drive Programming Manual Model E7U Document Number TM E7 02...
Страница 140: ...Programming 134 Notes...
Страница 170: ...Parameters A 30 Notes...
Страница 174: ...Factory Default Settings B 4 Notes...