Omron VARISPEED G7 -, Instruction Manual

Page: 247 / 417

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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
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
L1-03
Alarm opera-
tion selection
during motor
overheating Set H3-09 to E and select the opera-
tion when the input motor tempera-
ture (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 (H3 on the
Operator flashes).
0 to 3 3 No A A A A A
MOL Thm
Input
L1-04
Motor over-
heating oper-
ation
selection Set H3-09 to E and select the opera-
tion when the motor temperature
(thermistor) input exceeds the oper-
ation detection level (2.34 V).
0: Decelerate to stop
1: Coast to stop
2: Emergency stop using the
deceleration time in C1-09.
0 to 2 1 No A A A A A
MOL Filter
Time
L1-05
Motor tem-
perature input
filter time
constant
Set H3-09 to E and set the primary
delay time constant for motor tem-
perature (thermistor) inputs in sec-
onds.
0.00 to
10.00
0.20 s No A A A A A
MOL Filter
Time