Machine Protection
6-
63
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
H2-03 (multi-function output terminals M1-M2, P1-PC, and P2-PC function selection) to 1F (motor overload
OL1 pre-alarm), the motor overload pre-alarm will be enabled. If the electronic thermal value reaches mini-
mum 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
MEMO
BUS
Regis-
ter
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
L1-03
Alarm opera-
tion selection
during motor
overheating
Set Multi-function input termi-
nal
or A2 (H3-09)
to E and select the operation
when the input motor tempera-
ture (thermistor) input exceeds
the alarm detection level [1.17 V
(±5%)].
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
482H
L1-04
Motor over-
heating oper-
ation
selection
Set Multi-function input termi-
nal
or A2 (H3-09)
to E and select the operation
when the motor temperature
(thermistor) input exceeds the
operation detection level [2.34V
(±5%)].
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
483H
L1-05
Motor tem-
perature input
filter time
constant
Set Multi-function input termi-
nal
or A2 (H3-09)
to E and set the primary delay
time constant for motor temper-
ature (thermistor) inputs in sec-
onds.
0.00 to
10.00
0.20 s
No
A
A
A
A
484H
A3 (H3-05)
A3 (H3-05)
A3 (H3-05)