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5.8.1.2 Motor protection time constants: P0.02
Parameter
Name
Unit
No.
Motor Protection
P0.02
min
Time Constants
• P0.02 can be used to set the time when the motor protection function
is started.
• Normally it is not necessary to change P0.02.
• Set P0.02 if a 150% overload is applied after operating continuously at
the motor's rated current (hot start).
• For known motor's overload capacity, set the hot-start overload
resistance level, but allow some margin for safety.
Operating
Time (min)
10
7
3
1
0.4
100
This is the example when P0.02 is set to 1min
and the motor is operating at 60Hz.
Figure 5.24 Motor protection operating time
5. Parameters
5-61
Changeable
Setting
Factory
during
range
Setting
operation
0.0~60.0
8.0
X
Cold Start
Hot Start
Motor current (%)
150
200
(C 2.03 is 100%)
MOSCON-E7 User's Manual
5-62
5.8.1.3 Motor selection: P0.03
Parameter
Name
Unit
No.
P0.03
Motor Selection
-
• P0.03 can be used to set the motor protection characteristic.
• Induction motors (i.e. general-purpose motor and inverter motor) are
classified based on their cooling capabilities thus, the motor overload
function operates differently between them.
* General-purpose motor : When the motor is rotating at a low speed,
the motor's temperature rises faster than the inverter motor,
therefore torque must be limited to protect the motor from
overheating.
* Inverter motor : Motor's temperature rise relatively slower if it is
rotating at a low speed, therefore electronic thermal overload
protection is not activated.
continuous operation at low speed.
• Setting
Setting
Function
constant
0
Applied to general-purpose motor
1
Applied to inverter motor
Changeable
Setting
Factory
during
range
Setting
operation
0~1
0
X
Thus, use an inverter motor for
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