Hewlett-Packard 7500 Series Installation Manual
Download Installation manual of HP Photosmart 7500 Firewall, Printer for Free or View it Online on All-Guides.com.
Brand: HP
Category: Firewall , Printer , Switch
Type: Installation manual for HP Photosmart 7500
Pages: 151 (9.19 Mb)
4
Table 5 Harmful gas limits in an equipment room
Gas Maximum concentration (m
g
/m
3
)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the switch and application
system, adversely affect the switch in a conduction pattern of capacitance coupling, inductance coupling,
electromagnetic wave radiation, or common impedance (including the grounding system) coupling. To
prevent EMI, take the following actions:
• Take measures against interference from the power grid.
• Use a grounding system and lighting protection system for the switch separate from those for other
electric equipment, and keep them far away as possible.
• Keep the switch far away from radio transmitting stations, radar stations, and high-frequency
devices.
• Use electromagnetic shielding, for example, shielded interface cables, when necessary.
• Route interface cables only indoors to prevent signal ports from getting damaged by over-voltage
or over-current caused by lightning strikes.
Grounding
Using a good grounding system to protect your switch against lightning shocks, interferences, and ESD
is essential to the operating reliability of your switch.
Make sure the resistance between the chassis and the ground is less than 1 ohm.
Power
Perform the following tasks to meet the power requirements:
1. Calculate the total power consumption
The total power consumption varies by card type and density and fan assembly power
consumption. If the switch provides PoE power, the total power consumption must also include PoE
power consumption. For more information about total power consumption calculation, see
"Appendix A Chassis views and te
chnical specifications."
2. Select power supplies and identify the number of power supplies
The total maximum output power of all power supplies must be higher than the total power
consumption of the switch. For more information about available power supplies, see "Appendix
B FRUs and compatibility matrixes."
3. Verify that the power supply system at the installation site meets the requirements of the power
supplies, including the input method and rated input voltage.