about this Schneider Electric: ABL7RM24025 24V DC 2.5A PSU
They are product details at small print (specifications) which someone should take in mind before using this PSU in a charger application.
This PSU when consumption ampere are higher than what this can give, then this activates a tripping mode.
PSU load check this is working due voltage detection circuitry, and if output voltage under load this is below 19V, then tripping occurs.
Tripping translates to ON-OFF cycle every two seconds, additionally this translates that battery under charge, this receives charge but not constantly in the beginning.
Inside this battery cage there is a new battery pack of average quality Ni-Cd, I did the decision to lower charging voltage at 24V, so thermal effect at fully charge this to be minimal.
Because of ammeter I am able to see PSU tripping and this is annoying to watch, in the positive side of things tripping this is made electronically ( no relay clicking). In my application
this PSU it does the job, it is protected from damage, and internal electronics control this is very advanced.
But in this setup the new way of operation this is much different of what you will expect by previously using an transformer. In summary,
the charging mode starts with pulsing charge every two seconds (current spikes), as soon voltage gets higher and higher, current spikes duration this increases, as soon the load becomes acceptable, then the PSU it does deliver constant current at 2.4A.
Eventually battery pack this gets full progressively, at 24V charging voltage, lowest current becomes about 300mA, and about two hours later, battery packs starts having thermal effect ( gets slightly warm) and requires about 450mA in this condition.My thoughts:
I am somewhat happy because I did manage to offer one solution that it works to my customer, but I am not totally happy of this combination with ABL7RM24025.
Due lack of other alternatives in the form of new Ni-CD charger for this tool, I would convince my self so him to consider the result as acceptable.
Regarding assembly, I did a spectacular job, those pictures are my proofs.