LEESON Chassis Mount Regenerative Control: 175721.00 - Manual (Page 50)

Troubleshooting 44
Line fuse blows
1. Disconnect AC line voltage from the drive.
2. Check that the motor cable and armature are not
shorted or grounded.
a. Armature resistance should measure
approximately 1 to 100 ohms, depending on
motor horsepower.
b. A resistance reading from the motor frame to
either armature side should show open when
an ohmmeter is used on its high resistance
scale.
3. Check that the field circuit is not open.
4. A combination of ambient conditions and frequent
high-current spikes (i.e., reversing) causes fuse to
“nuisance trip”. Consider using a slow-blow fuse or
increasing the fuse rating to 120% of motor
current as stated on the nameplate.