Inter-Tel AXXESS Manual page 1521

b.
c.
d.
5.14 If AC power-related problems appear on the system while in operation, one of the fol-
lowing three methods can be used to test the ground.
•
Use a digital multimeter to measure the difference of potential between the equipment
chassis ground point and the power neutral, and between the chassis ground point and
the third wire ground. If the voltage measurement exceeds 0.5V, noise may develop on
the system. If this occurs, call an electrician.
•
Use a Megger to test the ground point. (A Megger should be available through the local
power company.) The reading should be 5 ohms or less.
•
Unplug the AC power cord from the outlet and insert a ground isolation plug into the
outlet. Plug the AC power cord into the ground isolation plug. If the problem ceases,
call an electrician. When finished, remove the ground isolation plug to restore ground
protection. DO NOT defeat (or leave floating) the ground wire in the AC power cord.
Figure D-6.
Equipment Chassis Grounding
GROUND
LUG
Power Supply Electrical Test
5.15 Perform the following electrical check on the power supply.
Ensure that the system AC power cable is not plugged in and the AC POWER switch
1.
on the front of the power supply is OFF.
Plug the recommended surge/spike protector provided into the proper power source:
2.
NOTE:
when installing the power supply. Also, DO NOT plug any other equipment into the
same AC outlet.
Plug the system AC power cable into the surge/spike protector and turn ON the AC
3.
POWER switch.
Equipment Chassis Grounding
INTER-TEL
The ground lug (indicated by the symbol
used.
Battery compartments, if used.
Trunk gas discharge tubes, if used.
CHASSIS
•
U.S.: Use a 105-125 VAC, 57-63 Hz, 15A, single-phase commercial power
source.
•
Europe: Use a 220-240 VAC, 50 Hz, 13A power source.
This MUST be an isolated, dedicated circuit. DO NOT use an extension cord
Appendix D — CPC64/CPU64 Configuration
® ®
AXXESS MANUAL VERSION 11.0 – May 2008
) on each Single-Line Adapter, if
SURGE/SPIKE PROTECTOR
WITH GROUND LUG
GROUND
WIRE
AC OUTLET
GOOD GROUND
Page D-31