Motor Overheating Protection Using Ptc Thermistor Inputs - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

Motor Overheating Protection Using PTC Thermistor Inputs

This function provides a motor overheating protection using a thermistor (PTC characteristic – Positive Tem-
perature Coefficient) that is built into the windings of each motor phase.
Related Constants
Con-
stant Name
Number
Alarm operation selection during
L1-03
motor overheating
Motor overheating operation
L1-04
selection
Motor temperature input filter
L1-05
time constant
PTC Thermistor Characteristics
The following diagram shows the characteristics of the PTC thermistor temperature to the resistance value.
Resistance (Ohms)
Fig 6.25 PTC Thermistor Temperature-Resistance Value Characteristics*
* The shown resistance value is for one motor phase. Normally the resistors are connected in series.
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Description
Selects the operation when the input motor temperature
(thermistor) input exceeds the alarm detection level (1.17
V).
0: Decelerate to stop
1: Coast to stop
2: Emergency stop using the deceleration time in C1-09.
3: Continue operation (oH3 on the Digital Operator
flashes).
Selects the operation when the motor temperature (ther-
mistor) input exceeds the operation detection level (2.34
V).
0: Decelerate to stop
1: Coast to stop
2: Emergency stop using the deceleration time in C1-09.
Sets the delay time constant for the motor temperature
(thermistor) input in seconds.
Class F Class H
Tr: Temperature threshold value
Temperatue
Machine Protection
Change
Setting Factory during Access
Range Setting Opera- Level
tion
0 to 3 3 No A
0 to 2 1 No A
0.00 to
0.20 s No A
10.00
35
6-