Setting Motor Protection Operation Time - YASKAWA Varispeed G7 Instruction Manual

L1-01
Set Motor Type
Value
Vector motor
3
(1:100)

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)
Operating time (min.)
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.
Tolerance Load Characteristics
Rated rotation speed
Short time 60 s.
= 100% speed
Continuous
Frame number
Max. speed of
200 LJ min.
Frame number Max. speed
of 160 MJ to 180 LJ
Frame number Max.
speed of 132 MJ
Rotation speed (%)
Cold start
Hot start
Motor current (%)
E2-01 is set to 100%
Fig 6.41 Motor Protection Operation Time
Electronic Thermal
Cooling Ability Operation (at 100%
Motor Load)
This motor yields a
cooling effect even
Operates continuously at
when operating at
0.6 to 60 Hz.
extremely low speeds
(approx. 0.6 Hz).
Machine Protection
1/4
(fre-
59
6-