SB203
ORIGINAL INSTRUCTIONS
4
Procedure
Electrical Lockout/Tagout Procedure
Procedure for Working Either on a Machine Inside the Machine’s Main
Electrical Enclosure or in the Electrical Transmission Line to the Machine
Before opening the main electrical enclosure or attempting to repair or replace an
electrical transmission line, lockout/tagout the machine properly. Follow your company’s
approved lockout/tagout procedures, which should include, but are not limited to, the steps
here.
1. Engage an E-stop on the machine.
2. If you have a
Wizard PDS
®
operator
station mounted to the gantry head, turn
that computer off now.
3. Turn the machine’s disconnect switch to
the Off position. This is usually required to
open the main electrical enclosure’s door.
4. Shut the power to the machine off at the
machine’s power source, which is usually
an electrical service entry panel on the
facility wall. One example of a locked-out
power source panel is shown in Figure 2.
5. Attach a lock and tag that meets OSHA
requirements for lockout/tagout to the
electrical service entry panel.
6. Wait 20 seconds for the VFD to discharge
any remaining power.
7. Open the door to the enclosure to which
you need access. Using a multimeter,
verify that the power is off.
!
WARNING
ELECTROCUTION HAZARD.
All electrical work must be performed by a qualified electrician.
Verify that all power to the machine has been turned off and follow
approved lockout/tagout safety procedures before performing any
maintenance.
If it is absolutely necessary to troubleshoot an energized
machine, follow NFPA 70E for proper procedures and person
protective equipment.
Figure 2: Lockout/Tagout on
the Power Source Panel
