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WARNING
ELECTRIC SHOCK can kill
Have an electrician install and service this equipment
Turn the input power off at the fuse box before working
on equipment
Do not touch electrically hot parts
Prior to performing preventive maintenance, perform
the following capacitor discharge procedure to avoid
electric shock.
MAINTENANCE
INPUT FILTER CAPACITOR
DISCHARGE PROCEDURE
1.
Remove main input power to the CITOTIG 315DC
or 415DC
2.
Remove the cover following the case removal
procedure available in this Service manual.
3.
The capacitors are discharged by discharge
resistors integrated into the input board in about 5
(five) minutes.
4.
Locate the two points POS and NEG on the Input
Board. See Figure 1
5.
Connect your multimeter positive probe to POS
point and your negative probe to NEG point and
check the voltage across DC bus capacitors.
6.
In case of presence of any residual voltage follow
the next steps
7.
Obtain a high resistance and high wattage resistor
( 500-1000 ohms and 25 watts minimum ). This
resistor is NOT supplied with the machine. NEVER
USE A SHORTING STRAP FOR THIS
PROCEDURE.
8.
Use electrically insulate gloves and insulated
pliers. Hold the body of the resistor and connect
the resistor leads across the two points POS and
NEG. See Figure 1. Hold the resistor in place for
10 seconds. DO NOT TOUCH CAPACITOR
TERMINALS WITH YOUR BARE HANDS.
9.
Check again the voltage across the two terminals
(POS and NEG). Voltage should be zero. If any
voltage remains, repeat this procedure.
NEG
INPUT BOARD - Figure 1
Showing 315DC input board
19
POS
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