3. Motor does not have abnormal vibration or beat.
4. Accel/decel is smooth.
Precautions
1, 2, 3...
1. The motor does not start up if both FWD and REV run signals
are turned on simultaneously. If they are turned on simulta-
neously during run, the motor decelerates to a stop.
2. When output frequency reaches 1.5 Hz (set value prior to ship-
ping) at deceleration, the dynamic brake (DB) operates for 0.5
s and metallic noise is generated by the motor. However, this
noise is normal.
3. If a fault occursduring acceleration or deceleration and the mo-
tor coasts to a stop, check the motor stopping position and then
the following items:
a) Load is not excessively large.
b) Accel/decel time is long enough for load.
Resetting must be performed by external signal input (or
RESET
key of the digital operator) or by turning off the power
supply.
1-6 Maintenance
Periodic Inspection
The 3G3SV requires very few routine checks. Itwill function longer
if it is kept clean, cool and dry, while observing the precautions
listed in “Location”. Check for tightness of electrical connections,
discoloration or other signs of overheating. Use Table 6 as the in-
spection guide. Before servicing, turn off AC main circuit power
and be sure that CHARGE lamp is off.
Table 6 Periodic Inspection
Component Check Corrective action
External terminals, unit
Loosened screws Tighten
mounting bolts, connectors, etc.
Loosened connectors Tighten
Cooling fins Build-up of dust and dirt Blow with dry compressed air of 57
to 85 lbs. in
2
(4to6kg
cm
2
)
pressure.
Printed circuit board Accumulation of conductive dust or
oil mist.
Clean the board. If dust and oil
cannot be removed, replace the
inverter unit.
Cooling fan For abnormal noise and vibration.
Whether the cumulative operation
time exceeds 20,000 hours or not.
Replace the cooling fan.
Power elements Accumulation of dust and dirt Blow with a dry compressed air of
57 to 85 lbs. in
2
(4to6kg
cm
2
)
pressure.
Smoothing capacitor Discoloration or odor Replace the capacitor or inverter
unit.
Section 1-6
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