Dc Power Supply Installation - Nortel Meridian 1 Option 11C Planning And Installation Manual

Page 136 of 408 Installing the power supplies

DC power supply installation

Table 15
DC power requirements
Recommended
Limits
Noise (CMESS)
Current
AC Ripple
553-3021-210 Standard 7.00
8 Test the ground of each system cabinet using the following:
a) Set the circuit breakers feeding the AC outlet used to power
the cabinet to OFF.
b) Connect the power line cord to the NTAK04 or NTDK78
main cabinet power supply.
c) Using an ohmmeter, measure the resistance from the ground
pin on the line cord to the ground receptacle on the AC outlet.
The resistance must be less than 0.25 Ohms.
If the cabinets are powered from different service panels, the
ground must be traced back to the panel serving the cabinet.
d) Reset the circuit breaker once the ground connection is
verified.
Minimum
(see note)
-42.5 V dc
-42.5 V dc
—
—
—
Note: The NTAK05 or NTDK72 DC breaker will trip
at -42.5 +/- 1.0Vdc.
Refer to the "DC-powered version" on page 51 for detailed information about
DC power requirements.
January 2002
Nominal
-52 V dc
-52 V dc
—
—
—
Maximum
-54 V dc
-57 V dc
25 dBrnc
12 Amps
100 mv RMS