Cambium Networks cnWave 5G Fixed, Руководство по эксплуатации и устранению неисправностей

Страница: 71 / 85

General Troubleshooting Procedures 71
Table 5: Details of pin number, wire color, and DC polarity
450m Wire color PSU Wire color DC Polarity Notes
Brown Red Positive (+ve)
Green Positive (+ve)
White Black Negative (-ve) Negative wires are closest to the
B1000 plug latch.
Yellow Negative (-ve)
Note
1. If the power supply wire strands are consolidated with solder, then snip the soldered
part off. Soldered strands must not be used in screwed or crimped connections.
2. When using a screw-terminal connector (as shown in Figure 54 ), make sure that the
wire strands are protected from the terminal screw. Use a terminal block with wire
protectors, such as leaf springs or a rising cage type, to fit crimp sleeves to the
conductor strands.
Power supply
The recommended power supply from Meanwell has a default output voltage of about 54 V. It can be
adjusted over a limited range using the trimmer under the black sealing bung labelled - Vo ADJ - on the
top face. It is recommended, particularly, for longer cable runs, or installations with an Auxiliary port PoE
load, to trim the output voltage up to between 57 V and 58 V. Gently prise the bung out, use a small
screwdriver with a DMM (meter) to set the voltage, and replace the bung before use.
If a different power supply is used, it must be fitted with fold-back current limiting means such as a
hiccup mode or fuse.
Testing
It is recommended that the wiring to the LPUs and radio be tested before making the connections to the
power supply. Use a meter, ideally a DMM (digital multi-multimeter) with a diode test range, to check the
following measurements. The LPUs and the radio must be connected, the power supply must not be
connected.
Table 6: Details of cable testing
Test
number Meter positive Meter negative Approximate
value Notes
1 Brown (pin 1) Green (pin 2) 0.6 ohms per 10 m
cable
8 ohms maximum
Proportionate to cable
length
2 White (pin 3) Yellow (pin 4)
3 Brown+Green
(pins 1+2) White+Yellow
(pins 3+4) 10 K (kohms)
minimum or 2 V
minimum Ohms test range or Diode
test range