5. Parameters
5-61
5.8.1.2 Motor protection time constants: P0.02
Parameter
No.
Name
Unit
Setting
range
Factory
Setting
Changeable
during
operation
P0.02
Motor Protection
Time Constants
min 0.0~60.0
8.0
X
• 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.
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
10
Operating
Time (min)
7
3
1
0.4
100
150 200
Cold Start
Hot Start
Motor current (%)
(C 2.03 is 100%)
5-62
MOSCON-E7 User’s Manual
5.8.1.3 Motor selection: P0.03
Parameter
No.
Name
Unit
Setting
range
Factory
Setting
Changeable
during
operation
P0.03 Motor
Selection
- 0~1 0
X
• 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. Thus, use an inverter motor for
continuous operation at low speed.
• Setting
Setting
constant
Function
0
Applied to general-purpose motor
1
Applied to inverter motor
