sayidengg

I'm actually looking for old PLCs too.

Thanks Sparky and OkiePC for your help. There was problem with faulty wiring , ground faults and also the sensor fouled. After rectifying these problems were able to use the old SMPS. OkiePC, the HMI we had in this system is not from Allen Bradley, as the OEM who built it got non Branded HMI . It mentioned for 24 Vdc though but was running with 21 VDC supply.

Hi all, once again I have got an issue at my factory regarding another type of oven which is fully automated. It has got HMI panel with Allen Bradley micrologix 1500. This oven system has few motors which are run by Allen Bradley Powerflex 700 [ 12 pieces numbers]. Then this system has cutter mechanism which is microcontroller based [ 2 pieces]. The Allen Bradley PLC microlgix 1500 has Digital input and anolog output modules separate. There are few dc and ac relays in this system. Sensors are also included. This oven is standby type of oven, if the main oven fails or if the production is needed more, then this is brought in. Today, we have tried to start this oven. Its not letting HMI to power up even when the whole oven system is up. SMPS, which is feeding this system the supply of 24 VDC with 6 amps output[ 21 v DC tested @ o/p of SMPS with multimeter]. And we found out the VDC at the i/p of HMI to be 10V dc. So, what we did, is we gave differet direct 24 Vdc supply to HMI instead of the oven control system . It started up prefectly. Now, im wondering whether the smps is bad or should we check something else in this oven control system. Please let me what will be the 3way to deal with this type of situation. Thanks once agin all