YASKAWA Varispeed-606PC3 Instruction Manual download pdf (Page 173)

172

 Motor Protection

 Motor Overload Detection

The Varispeed V7 protects against motor overload with a built-in elec-

tonic thermal overload relay.

Motor Rated Current (Electronic Thermal Reference Current,

n036)

Set the rated current value shown on the motor nameplate.

Note: Setting n036 to 0.0 A disables the motor overload protective function.

Motor Overload Protection Selection (n037, n038)

The electronic thermal overload function monitors the motor tempera-

ture based on Inverter output current and time to protect the motor from

overheating. When the electronic thermal overload relay is enabled, an

error occurs, and the Inverter output is turned OFF to prevent

excessive overheating in the motor. When operating with one Inverter

connected to one motor, an external thermal relay is not needed. When

operating more than one motor with one Inverter, install a thermal relay

on each motor.

General-purpose Motors and Inverter Motors

Induction motors are classified as general-purpose motors or Inverter

motors based on their cooling capabilities. The motor overoad function

operates differently for these two motor types.

n037

Setting

Electronic Thermal Characteristics

0 For general-purpose motor

1 For Inverter motor

2 Electronic thermal overload protection not provided.

Constant

No.

Name Unit Setting Range Factory

Setting

n038 Electronic Thermal Mo-

tor Protection Time

Constant Setting

1 min 1 to 60 min 8 min

1 2 ... 168 169 170 171 172 173 174 175 176 177 178 ... 255 256

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YASKAWA Varispeed-606PC3 Instruction Manual Page 173