Harmonic HLP 4800, User Manual, Page: 15 / 20

Chapter 3 Installing the HLP 4800 Platform Power Requirements
© 2009 Harmonic Inc. 15 HLP 4800, Version 1.0, Rev A
3.3.1 Connecting the Grounding Lugs
Connect the ground contact to ground. This is important for your safety. The ground contact
is located on the rear panel, which is shown in
Figure 2-2 on page 13. the thread is 10-32
UNC.
3.4 Power Requirements
The HLP 4800 accepts CPS 4800 power supply modules that generate 24 VDC for the
internal bus. For standard 100-240 VAC, 50/60 Hz input the CPS 4800-AC module is used.
For standard -48VDC input the CPS 4800-DC module is used.
To install the CPS4800 see the CPS 4800 Users Guide.
3.4.1 Connecting an External 24 VDC Power Source
The unit can have backup power by an external 24 VDC source. This input is only protected
by an internal fuse, and it is your responsibility to keep this voltage below + 28 V and have
surge and spike protection. If you do not, the plug-in units may be damaged.
Connect the external 24 VDC power source to the terminal block connector located on the
rear of the HLP 4800 according to
Figure 2-2: Rear panel, HLP 4800 on page 13. Switch the
external supply off prior to making the connection and observe the correct polarity. Use
number 14 AWG wire. Refer to
Figure 3-1: +24V backup terminal block Harmonic Part
Number 406-0000556 on page 15.
Figure 3-1: +24V backup terminal block Harmonic Part Number 406-0000556
DANGER:
To avoid personal injury and equipment damage, switch off the power from the DC source
before installing. Never handle live wiring.
3.5 Connecting the Alarm Relay
External alarm equipment can be connected to the HLP 4800. The HLP 4800 has a 5-pin
alarm relay located on the rear panel, as shown in
Figure 2-2: Rear panel, HLP 4800 on
page 13.
+ input
- input