3Com SuperStack 3, User Manual

Page: 27 / 64

Powering Up the Advanced RPS 27
Powering Up the Advanced RPS
Once the Advanced RPS is in place, you can power up the unit.
1 Connect the AC power cord(s) to the power sockets (mains AC
power inlets) at the rear of the RPS. The chassis will always draw
power through mains inlet A (labelled Primary Pwr A) in preference
to inlet B (labelled Backup Pwr B). You should ensure that your
primary power source is always connected to inlet A, and the backup
supply connected to inlet B. If using just one AC cable connect it to
mains inlet A.
2
Connect the DC cables to the power modules and SuperStack units,
if you have not already done so. See “Connecting the DC Cables” on
page 25.
3 Once all the cables are securely connected, the Advanced RPS is
ready to operate. There is no ON/OFF switch on the Advanced RPS.
To start the Advanced RPS, plug the AC power cord(s) into a mains
outlet.
Checking for Correct Operation
When powered up, the INPUT LEDs should light green. Only one LED
lights if there is only one AC power cord connected. If a power
module is supplying power to a SuperStack unit then the OUTPUT
LED corresponding to this power module will light green. See “LEDs”
on page 12.
There is an approximate 5-second time delay after power up before
the power module becomes active and the LED lights on the chassis
front panel.
Additional Information
Many products in the SuperStack range have an auto-enable feature.
These products are indicated with an asterisk (*) in Appendix C. This
permits the SuperStack product to be connected to the mains and to
the Advanced RPS at the same time. This is called managed
redundancy. With Type 1 and 2 Power Modules configured for
managed redundancy, if the SuperStack unit’s mains fails, the
Advanced RPS will automatically cut in to provide power to the
SuperStack unit after about 5 seconds. The unit may reset, as in a
power cycle.
16070ug4.bk.book Page 27 Thursday, December 14, 2000 12:17 PM