Chapter 7 Maintenance 43
NetSure 801 AG1 Power Supply System User Manual
Name of the communication station
Earth resistance (Ω)
station, ground satellite station, and microwave junction station
Microwave relay station, fiber relay station
< 10
Microwave passive relay station
< 20 (may be up to 30
in the
case of high soil resistivity)
7.2 Routine Maintenance Items
This chapter introduces routine maintenance items for power supply system and maintenance operation methods.
The power supply system maintenance items are list in Table 7-6.
Table 7-6 Maintenance items for power supply system
No.
Item
Test standard
Test tools
Test method
1
System current
sharing
After each rectifier is over half load, the
output current imblance between
rectifiers should be less than ± 3%
Calculate the imblance based on the
output current of each rectifier displayed
on on the controller; or the rectifier output
current displayed on each rectifier
2
Display of voltage /
current
The difference between the the rectifier
voltage, busbar voltage and various
output voltages displayed on the
controller shall be less than 0.2V; the
difference between the sum of the
displayed currents of all rectifiers and
the sum of charge current and total load
current shall be within the specified error
range
Read the voltage and current values
displayed on the controller and rectifiers,
and make judgement according to the
above standards
3
Parameter setting
Conduct compliance check according to
the record of the previously setting
parameters (parameter table)
Reset those parameters not in conformity
with the specified requirements. The
operation method of parameter setting can
refer to
See
NetSure
™
Control Unit (NCU)
User Manual, UMM830B (Issue AA, June
3, 2014)
4
Communication
function
The communication between each
system unit and the controller shall be
normal and there shall be no record of
frequent communication interrupt
between one certain unit and the
controller in the shistorical alarm record
5
Alarm function
Alarm should be given out in case of
fault
Check the testable items on the spot.
Testable items include AC mains failure,
damage to SPDs (SPDs with alarm
indicator or alarm contact), module failure
and DC fuse blowout (test shall be
conducted on unload fuse)
6
Protection function
Conduct compliance check according to
factory parameters or parameters set
through the controller
This item is generally not easy to test
when the system is in the operation. It is
usually conducted when the prptection
function of the power supply is abnormal
due to frequent occurrence of AC or DC
protection. Test methods including testing
the AC under/overvoltage protection
function through external voltage regulator
and testing the DC under/overvoltage
protection function by forced discharge
