Motor Overheating Protection Using Ptc Thermistor Inputs - Omron VARISPEED G7 Instruction Manual

Setting the Motor Overload Pre-Alarm
If the motor overload protection function is enabled (i.e., L1-01 is set to other than 0) and you set H2-01 to
H2-05 (multi-function output terminals M1-M2, M3-M4, M5-M6, P3-C3, and P4-C4 function selection) to 1F
(motor overload OL1 pre-alarm), the motor overload pre-alarm will be enabled. If the electronic thermal value
reaches minimum 90% of the overload detection level, the output terminal that has been set will be turned ON.

Motor Overheating Protection Using PTC Thermistor Inputs

Perform motor overheating protection using the thermistor temperature resistance characteristics of the PTC
(Positive Temperature Coefficient) built into the windings of each motor phase.
Related Constants
Con-
stant
Number
L1-03
L1-04
L1-05
-52
6
Name
Description
Display
Alarm opera- Set H3-09 to E and select the opera-
tion selection tion when the input motor tempera-
during motor ture (thermistor) input exceeds the
overheating alarm detection level (1.17 V).
0: Decelerate to stop
1: Coast to stop
2: Emergency stop using the
MOL Thm
deceleration time in C1-09.
Input
3: Continue operation (H3 on the
Operator flashes).
Motor over- Set H3-09 to E and select the opera-
heating oper- tion when the motor temperature
ation (thermistor) input exceeds the oper-
selection ation detection level (2.34 V).
0: Decelerate to stop
1: Coast to stop
MOL Filter
2: Emergency stop using the
Time
deceleration time in C1-09.
Motor tem-
perature input
Set H3-09 to E and set the primary
filter time
delay time constant for motor tem-
constant
perature (thermistor) inputs in sec-
onds.
MOL Filter
Time
Change
Setting Factory during
Range Setting Opera-
V/f
tion
0 to 3 3 No A
0 to 2 1 No A
0.00 to
0.20 s No A
10.00
Control Methods
Open Open
V/f Flux
Loop Loop
with Vec-
Vector Vector
PG tor
1 2
A A A A
A A A A
A A A A