Powerware 4500, 6000 Using the PPDM, Using Maintenance Bypass

UPS Operation

Using the PPDM

The PPDM provides continuous online power for your equipment. With the PPDM, you can replace or upgrade the PPU without losing power to your equipment. Figure 23 shows the operation of the UPS with the PPDM.

Utility

Power

In

PPU

Out

PPDM UPS Load

BatteryBattery

Figure 23. UPS and PPDM Block Diagram

Using Maintenance Bypass

Use the following procedure to transfer the critical load to Maintenance Bypass (AC Line operation) and remove the PPU:

1.Turn the Bypass switch on the PPDM to the BYPASS position (see Figure 24). The PPDM is now powering your equipment from utility power.

2.Press and hold the Output Off button until the long beep ceases (approximately three seconds). The µindicator remains lit.

3.Switch the PPU input breaker to the OFF (O) position.

The UPS enters Battery mode for several seconds. The µindicator turns off and the UPS shuts down.

54 Powerware® 9 Prestige Series User’s Guide (4500/6000 VA) S Rev H www.powerware.com