Machine Protection
6-
53
PTC Thermistor Characteristics
The following diagram shows the characteristics of the PTC thermistor temperature to the resistance value.
Fig 6.40 PTC Thermistor Temperature-Resistance Value Characteristics
Operation during Motor Overheating
Set the operation if the motor overheats in constants L1-03 and L1-04. Set the motor temperature input filter
time constant in L1-05. If the motor overheats, the OH3 and OH4 error codes will be displayed on the Digital
Operator.
Error Codes If the Motor Overheats
By setting H3-09 (Multi-function Analog Input Terminal A2 Function Selection) or H3-05 (Multi-function
Analog Input Terminal A3 Function Selection) to E (Motor temperature input), you can detect alarm OH3 or
OH4 using the PTC temperature-resistance characteristics, and protect the motor. The terminal connections
are shown in the following diagram.
Fig 6.41 Mutual Connections During Motor Overheating Protection
Error Code
Details
OH3
Inverter stops or continues to operate, according to the setting in L1-03.
OH4
Inverter stops according to the setting in L1-04.
Tr: Temperature threshold value
Tr+5
Tr
550
1330
Resistance (ohms)
Class F
150
°
C
Class H
180
°
C
Temperature
Inverter
Multi-function
contact input
Branch resistance
18 k
Ω
PTC thermistor
Multi-function
contact output
Multi-function
PHC output
Fault contact
output
P3
C3
C4
P4
Содержание VARISPEED G7 -
Страница 3: ......
Страница 11: ...viii...
Страница 33: ...1 16...
Страница 105: ...4 20...
Страница 349: ...6 154...
Страница 375: ...7 26...
Страница 413: ...10 24...
Страница 417: ......