I am not certain communicating with me off the forum is in your best interest. The best reason is: someone else here may see something I don’t.
As long as you are checking voltages, check both ends! Check the output of the power supply at the supply, and at the router.
The ideal voltage and amps should be 24 volts and 1 amp or 2 amps. Why go for 10 amps or 25 amps they can power up 10 numbers of 433ah. check if your routerboard is properly grounded. Why need a 275KVA data centre UPS for a small device like 433AH. i have powered mine with a 600 VA UPS and adapter is 24 volts 2 amps. Works absolutely fine.
My adapter is 24 volts 1 Amps and it is on PoE with 25 meter cable and showing 16 volts.
what where your measurements with multimeter on both ends of cable.
As some said already - drop from 24V to 16V over 25m cable is not possible, unless something is broken, either cable or power supply. How long that router is there, is that port functional? Maybe port itself is damaged somehow.
I have been trying to tell u that although ur adapter shows 24Volts (it is marked 24 volts) but actually it is 18 Volts. It happens many times with Mikrotik vendors in India. check the voltage u r getting with a multimeter before u insert in the POE. I am sure it is not 24 volts.
I have checked with multimeter also its shows 24.7 volts
Can i also checked with cat cable for use to power up the RB433AH which pins curry current for router out of 8 wires.
Birender
There should be power on only two of the CAT5 lines. Two ground, two power and the data lines.
Here are all the different types of PoE units with the pinouts:
http://www.allpinouts.org/index.php/Power_over_Ethernet_(PoE)
You want the type that uses only spare pairs, not data pairs.
ADD: Check both end connectors on the CAT5 carefully. Maybe one or more wires are not making contact in the connector, or connected to the wrong pin. The voltage drop you show is consistent with a power line or ground line not connected properly.
Here is the mathematics: If you have a voltage drop of 8 volts in a quiescent state, when those radios start to transmit, the power requirement will at least double. That translates mathematically to another 8 volt drop. That is now a 16 volt drop when all radios transmit.
24 - 16 = 8
Minimum is 10v.
When i activate my one card out of three its showing 16 to 18 volts and when i activate all cards three still showing same volts 16 to 18 volts in system-health.
what is the prob
Birender
You did verify when the router is operating:
Then you tell me. How do you get the 8 volt drop at about a half amp when it is idling, and don’t expect the voltage to drop at twice the current when running full speed? There is resistance in the power line (CAT5) if all you told me is correct. It is Ohm’s Law!
E = I * R
P = I * E
ADD: The only alternative I can see is if one of the power supply lines in the CAT5 is connected to the wrong pin, and the data line (or ground line) is dragging down the voltage. But that does not seem reasonable by the size of your power supplies. That would have burned out that input or the wire in no time at all.
When i checked at cat ending at router side its showing 23.6 volts i checked with multimeter
Birender
Is that 23.6v reading with the CAT5 connected to the router? If you have just the load of the multimeter on the CAT5, even with a resistive power connection, it will show almost 24v. But add a 6 watt load to a resistive power connection and you have a voltage drop!
Maybe I wasn’t clear. You need to check the voltages on each end of the CAT5 while the router is connected and working!
ADD: By “resistive”, I am talking just a few ohms here (less than 10) to cause this much drop. 24ga wire has a resistance of 3 ohms per 100’. If, for some reason, you have only one power and one ground wire connected, the circuit resistance would be about 6 ohms. Enough to cause that voltage drop.
Let me try this also but during router connected how can i check adapter jack is injected into PoE and other end is in touter sealed box
The router end should not be a problem, even tho I think the output of the voltage from your router is correct. You might need a “breakout” connector on the CAT5 on the power supply end if there is no access to the power supply output at the supply. If you install your own ends, it may be worthwhile to strip a bit of wire back close to the connector, do the test, then install a new connector after cutting off the exposed wire.
ADD: Or get an extension cord and plug the power supply into the power jack on the router. Not permanent, just as a test. If it normally fails in 20 minutes, a couple hours on the power jack should answer the question.
FYI: I don’t use PoE any more, and this is why. I run much larger wire and connect to the power jack. Wire breaks, connector failures, and those cheap CAT5 bulkhead fittings to get into the sealed box caused me way too much grief!