HEXMOTO Indverter V2 - Preventive Maintenance; Measurement of Output Voltage and Current; Maintenance and Troubleshooting

Indverter V2 Manual
Issue 03 Dated 11 November 2009 S/w Ver 12.4 HEXMOTO
Controls Pvt.Ltd
43
11. MAINTENANCE AND TROUBLESHOOTING
Preventive Maintenance
Routine maintenance and inspection are essential for reliable operation of the drive
module. Routine maintenance must involve the following activities
1. Inspection of cooling fans and its operation
2. Cleaning of dust accumulated near the cooling fans, Heatsink and other terminals by
blowing dry air. This is very important especially in textile mills where the cotton is
expected to clog the air passage.
3. Check for tightness of all connections including power and control logic.
4. Connection to motor terminals must also be checked for tightness.
Maintenance Tests
When conducting an external circuit megger test, disconnect all inverter terminals. Make
sure that high-test voltages are never applied to the Inverter terminals. Authorized
personnel must ensure to remove the noise capacitors near the Power input RST
terminals.
Megger test for the Inverter module is not recommended. If need arises, perform the test
only on the power wiring after removing all PCBs from the module. Authorized personnel
must be present for this test
For continuity checking on control circuits, use a multimeter in high resistance mode and
not a megger or buzzer.
Please note that life of an electrolytic capacitor which is used in the drive system is
approximately 5 years. It is recommended that capacitors be replaced after this period
for smooth operation of the drive system.
Measurement of output voltage and Current
Inverter output voltages are generated using PWM technology. It is a sine waveform
constructed using Pulse width modulation. Precision measurements of voltages using
standard digital multimeters are not possible. It is recommended to use Rectifier type
analog voltmeters to measure the output voltages. Drive input currents are again non-
sinusoidal and clamp-on meters does not provide correct values. It is recommended to
use Moving-iron type Ammeter for precision measurements. In case of measurements
WARNING
Do not open the Indverter module with Input Power ON. Indverter should be opened
onl
y
after the LED displa
y
switches off. The internal components or PCBs should be
handled/ removed onl
y
after the char
g
e LED on the Power board is visibl
y
OFF.
Contact with internal components while input power is ON or the char
g
e LED is ON,
may cause severe Electric Shock
Do not touch power connection TBs until DC Bus voltage is completely discharged
While plu
gg
in
g
in or removin
g
a connector ensure not to put much force on
connector housings, which are soldered to the PCB.