Chapter 7 – Trouble Shooting & Maintenance
7-15
Inspection
Item
Inspection
Period
Inspection Method Criterion
Customer use
Check/ Initial
/Date
Monthly
1 year
2 year
Powered drive - Not Running
Operating Checks/Measurements
Input
Voltages
Is the input voltage from
the main within spec of
the drive?
X
Measure the voltage between the
terminals R, S, T.
drive rating +/-
15%
Is the input voltage from
the main balanced within
spec of the drive?
X 2%
DC Bus
Voltage
Is the DC Bus Higher or
Lower than normal?
X
Measure the DC Voltage between
the Pos. and Neg. terminals of the
drive.
Input Voltage x
SQRT2 (+/-
10%)
Cooling Fan
Is there any abnormal
oscillations or noise?
X
Turn OFF the power and turn the
fan by hand.
Must rotate
smoothly.
Trip Circuit
(Input to
drive)
Is drive trip circuit
functional?
X
Identify the drive input trip circuit.
Open or Close external trip
mechanism.
drive must trip.
Powered Drive - Running
Operating Checks/Measurements
Output
Voltages
Is there any voltage
imbalance between
phases of the output?
X
Measure the voltage between the
output terminals U, V and W.
for 230V (4V)
for 460V (8V)
for 600V (12)
Does the displayed
Output Voltage agree
with measurement?
X
Display parameter for Output
Voltage, compare to measured
value.
Tol. -10%+20%
Note 1
Output
Current
Is there any current
imbalance between
phases of the output?
X
Measure the current out of each
phase U, V, W.
Tol. +/-3%
Note 1
Does the displayed
Output Current agree with
measurement?
X
Display parameter for Output
Current, compare to measured
value.
Tol. +/-5%
Note 1
General
Are there any abnormal
vibrations or noise?
X
Auditory, sensory, visual check. Yes/No
Is there any unusual odor? X Check for overheat and damage. Yes/No
Note1
Multimeter measurements of drive output could vary
depending on the type of meter.
7.5.4 PartsReplacement
Part name Period Comments
Cooling fans 2-3 years Exchange for a new fan after consulting
Benshaw customer service center.
Electrolytic
capacitors
5 years Perform periodic inspections every year.
Exchange after testing and consulting
Benshaw customer service center.
The Recommended capacitance level to
replace a capacitor in the main/control
circuit is when it has 85% or less of its
initial value of capacitance.
Relays / Contactor - Exchange for a new part after consulting
Benshaw customer service center.
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