Setting Motor Protection Operation Time - YASKAWA Varispeed G7 Series Instruction Manual

L1-01
Set
Value
3


Setting Motor Protection Operation Time

Set the motor protection operation time in L1-02.
If, after operating the motor continuously at the rated current, a 150% overload is experienced, set the (hot
start) electronic thermal protection operation time. The factory setting is resistance to 150% for 60 seconds.
The following diagram shows an example of the characteristics of the electronic thermal protection operation
time (L1-02 = 1.0 min., operation at 60 Hz, general-purpose motor characteristics, when L1-01 is set to 1)
Operation time (minutes)
10
7
3
1
0.4
0.1
0
Setting Precautions
If multiple motors are connected to one Inverter, set constant L1-01 to 0 (disabled). To protect the motor,
•
install a thermal relay in the motor power cable, and perform overload protection on each motor.
• With applications where the power supply is often turned ON and OFF, there is a risk that the circuit cannot be pro-
tected even if this constant has been set to 1 (enabled), because the thermal value will be reset.
To detect overloads in good time, set the set value in constant L1-02 to a low setting.
•
When using a general-purpose motor (standard motor), the cooling ability will be lowered by f
•
quency). Consequently, the frequency may cause motor overload protection (OL1) to occur, even below
the rated current. If operating using the rated current at a low frequency, use a special motor.
-60
6
Motor Type Tolerance Load Characteristics
Short time 60 s.
Vector motor
Continuous
(1:100)
100 150
Fig 6.42 Motor Protection Operation Time
Cooling Ability
Rated rotation speed
= 100% speed
This motor yields a
cooling effect even
when operating at
Frame number
Max. speed of extremely low speeds
200 LJ min.
(approx. 0.6 Hz).
Frame number Max. speed
of 160 MJ to 180 LJ
Frame number Max.
speed of 132 MJ
Rotation speed (%)
Cold start (Characteristics when an overload occurs
at a complete stop)
Hot start (Characteristics when an overload occurs
during continuous operation at 100%)
Motor current (%)
200
E2-01 = 100% motor current
Electronic Thermal
Operation (at 100%
Motor Load)
Operates continuously at
0.6 to 60 Hz.
1/4
(fre-