2.8 L: Protection Functions
YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide 201
2.8 L: Protection Functions
u L1: Motor Protection
n L1-01: Motor Overload Protection Selection
The drive has an electronic overload protection function that estimates the motor overload level based on output current,
output frequency, thermal motor characteristics, and time. An oL1 fault will be triggered when motor overload is
detected and drive output will be shut off.
L1-01 sets the overload protection function characteristics according to the motor being used.
Note: 1. When the motor protection function is enabled (L1-01 ≠ 0), an oL1 alarm can be output through one of the contact outputs by setting
H2-01 to 1F. The output will close when the motor overload level reaches 90% of the oL1 detection level.
2. Select a method to protect the motor from overheat by setting L1-01 to 1 when running a single motor from the drive. An external
thermal relay is not needed.
Setting 0: Disabled (motor overload protection is not provided)
This setting should be used if no motor overheat protection is desired or if multiple motors are connected to a single
drive. In this case it is recommended to install a thermal relay for each motor as shown in Figure 2.70.
Figure 2.70
Figure 2.70 Example of Protection Circuit Design for Multiple Motors
NOTICE: Thermal protection cannot be provided when running multi-motors simultaneously with the same drive, or when using
motors with a current rating that is relatively high when compared with other standard motors. Failure to comply could result
in motor damage. Disable the electronic overload protection of the drive (L1-01 = “0: Disabled”) and protect each motor with
individual motor thermal overloads.
Note: Close MC1 and MC2 before operating the drive. (MC1 and MC2 cannot be switched off during run.)
Setting 1: Enabled (motor overload protection is provided)
Sets the time it takes the drive to detect motor overheat due to overload. This setting rarely requires adjustment.
No.
<1> For details on the default settings, refer to Control Mode Dependent Parameter Default Values on page 84.
Name Setting Range Default
L1-01 Motor Overload Protection Selection 0, 1 Determined by A1-02 <1>
Drive
Power
supply
M1
MC1
MC1, MC2: Magnetic contactors
L10, L20: Thermal relays
L10
MC2 L20
M2
MV1000ParameterGuide_E_conditional.book 201 ページ ２０１３年１０月１１日 金曜日 午後８時１８分
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