Removing an MX2020 Three-Phase Delta AC Power Cord
To remove a three-phase delta AC power cord:
1. Switch off the customer site circuit breakers to the PDM being removed. Make sure that the voltage
across the AC power source cord is 0 V and that there is no chance that the cord might become active
during the installation process.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
one of the ESD points on the chassis.
3. Switch the power switch on the PSM faceplate to the off (O) position.
NOTE: After powering off a PSM, wait at least 60 seconds before turning it back on.
4. Remove the ESD grounding strap from the ESD point on the chassis, and attach it to an approved site
ESD grounding point. See the instructions for your site.
5. Disconnect the AC power cord (see Figure 285 on page 634) from the power source.
Figure 285: Three-Phase Delta AC Power Cord
6. Remove the ESD grounding strap from the approved site ESD grounding point. See the instructions
for your site. Reconnect the strap to one of the ESD points on the chassis.
7. Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the metal wiring
compartment that protects the AC terminal block.
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