sayedengg

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.

Power-Factor

Sounds like the PS may be too small. With 21vdc reading at the start is a bit off to me too. At this point you are already in trouble. The HMI will most likely need 23vdc to power up. You may also have a small short to ground in the system pulling some of the 24vdc down. However this usually pulls it all down. You could use a second PS for the HMI or put a larger one in for the whole system. One that will allow you to adjust the 24vdc to balance the output and load draw.

sayedengg

Thanks power factor, the problem was faulty wiring which was pulling down supply. Then after getting that resolved HMI started to work . There was fouled sensor too that was causing the one of the motors in the system not to function properly.