Yaskawa EUS61501X - Manual (Page 14)

3 Safety Procedure
14 YASKAWA TOEP YEAOPT 06 YASKAWA AC Drive - G5HHP Power Supply Unit with Charge LED Safety Precautions
6.
DISCHARGE PROCEDURE 3: Use this procedure only if necessary: If unsafe voltages greater than 50 Vdc are
present after 1 hour and waiting 8-12 hours is not possible.
WARNING! Safe voltages must always be verified by use of a calibrated multimeter.
NOTICE: Spark Hazard. A small arc or spark may occur when touching the bleed resistor to the (+) and (-) terminals as shown in
Figure 7. This is normal and does not present a hazard in non-combustable environments.
Following steps 6.a to 6.d below use the discharge circuit shown in Figure 7 to bleed off remaining hazardous
voltage to less than 50 Vdc. Utilize personal protective equipment as specified in Table 3 .
6.a. Remove fuse FU3 by use of a fuse puller to electrically isolate the drive from the power supply. See Figure 7 .
6.b. Connect the bleed resistor across the plus (+) and minus (-) bus capacitor terminals on the Power Supply Unit for
1 minute. Remove the bleed resistor. See
Figure 7 .
6.c. Using a calibrated multimeter, recheck for hazardous voltages. Refer to Figure 4 . If voltages are at a safe level
less than 50 Vdc on bus capacitors and and 0 Vac on 4PCB TB1 then the Power Supply Unit can be safely removed
according to STEP
3.
6.d. If voltages on bus capacitors are still greater than 50 Vdc, repeat procedure steps 6.b and 6.c until voltages are
less than 50 Vdc, then remove the Power Supply Unit.
Figure 7
Figure 7 Discharge Procedure 3, Use of a Bleed Resistor
7.
END.
A – Insulated test probes rated 600 Vac
minimum
C – 14 ga insulated wire rated 600 Vac
minimum
B – Insulated resistor: 2000 ohm 50 W. Resistor manufacturer- Ohmite 270 series power
resistor 2.0 kohms 50 W, part number: L50J2K0 or equivalent.
NOTE: Resistor must be insulated. Use electrical tape or heat shrink tubing.
WARNING
Risk of Electric Shock - Do Not Touch
The internal capacitor remains charged after the power supply is turned off.
Disconnect all power to the drive before servicing.
Measure Wait until the status indicator LED is off, and then measure the DC
bus voltage to confirm a safe level below 50 Vdc before servicing. The charge
indicator LED will extinguish when the DC bus voltage is below 50 Vdc.
Failure to comply can result in death or serious injury from electric shock.
W
ARNING
Risk of Electric Shock - Do Not
Touch
2000 Ohm
50 Watt Resistor
A
B C
Side View
Use fuse puller and remove fuse FU3 before
connecting the 2000 ohm bleed resistor.
FU3
W
ARNING
Risk of Electric Shock - Do Not T
ouch
The internal capacitor remains charged
after the power supply is turned of
f.
Disconnect all power to the drive before
servicing.
Wait until the status indicator LED is of
f,
and then measure DC bus voltage to
confirm a safe level below 50 Vdc before
servicing. The charge indicator LED will
extinguish when the DC bus voltage is
below 50 Vdc.
Failure to comply can result in serious
injury or death from electric shock.
MASS: 3.1 Kg POWER SUPPL
Y UNIT
CODE NO.:
SER NO. : N4WXXXX-X-X
LOT NO.:
YA SKA W A ELECTRIC CORPORA
TION EUS6150XX