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Chapter 6 Fault Code Information and Maintenance|
Revision Nov. 2008, VLE1, SW V1.03 6-11
6.2 Maintenance and Inspections
Before the check-up, always turn off the AC input power and remove the cover. Wait at least 10
minutes after all display lamps have gone out, and then confirm that the capacitors have fully
discharged by measuring the voltage between DC+ and DC-. The voltage between DC+ and DC-
should be less than 25VDC.
Ambient environment
Maintenance
Period
Check Items Methods and Criterion
Daily
Half
Year
One
Year
Check the ambient temperature,
humidity, vibration and see if
there are any dust, gas, oil or
water drops
Visual inspection and measurement
with equipment with standard
specification
{
If there are any dangerous
objects
Visual inspection
{
Voltage
Maintenance
Period
Check Items Methods and Criterion
Daily
Half
Year
One
Year
Check if the voltage of main
circuit and control circuit is
correct
Measure with multimeter with standard
specification
{
Keypad
Maintenance
Period
Check Items Methods and Criterion
Daily
Half
Year
One
Year
Is the display clear for reading Visual inspection
{
Any missing characters Visual inspection
{