YASKAWA VS MINI J7 series, Instruction Manual

Page: 94 / 118

94
• Motor Protection
Built-in electronic thermal overload protection is provided to protect against motor
overheating.
•
Motor rated current (electronic thermal reference current, n32)
Set to the rated current value shown on the motor nameplate.
• Motor overload protection selection (n33, n34).
The electronic thermal overload function calculates motor temperature, based on
inverter output current and time, to protect the motor from overheating. When the
electronic thermal overload relay is enabled and excessive current is flowing to the
motor, an “
” error occurs, shutting OFF the inverter output and preventing
excessive overheating in the motor. When operating with one inverter connected to one
motor, an external thermal relay is not needed. When operating several motors with
one inverter, install a thermal relay on each motor and disable the electronic overload
protection (n33=2).
Motor overload detection
n33 Setting Electronic Thermal Characteristics
0 Applied to general-purpose motor (limited speed range)
1 Applied to inverter duty motor (wide speed range)
2 Electronic thermal overload protection not provided
Parameters
No.
Name Unit Setting Range Initial Setting
n34
Protection parameter
selection
1min 1 to 60min 8min
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