Same here, I've never seen one applied on a 60kW, 600V EDG and we don't have a L-N loads. And, Waross, you just brought up a good point there. Reliability doesn't only mean 'working even if there is a GF'. Reliability also applies to other discipline, NON-electrical discipline. I've put in an...
Hi,
Anyone here have applied a HRG (high resistance grounding) scheme on a 60kW EDG? Our process engineers are saying that the system that the EDG is supplying should be ON at all time as much as possible but I feel that putting one on that small load is not worth spending a NEMA 3R resistor...
Thanks for the input Jraef. Will go to site and talk to the electricians tomorrow, we'll see what's actually there and will also check how they wired their PLC inputs.
Cheers,
Hi Jraef,
I'm aware that with type IIB and IIC, there is a pre-wired interconnection between control TB among the MCC buckets. I also know that it's only with Type 2C that you get a "marshalling" section at the end of the line up. I also know that CPT for each bucket has its own neutral to...
Hi Controlsdude,
I get your point about overloading the capacity of the neutral and who easy it is to mess things up there is one neutral for all those PLC signals.
I haven't wired it myself, I usually deal with type 1B MCC's where control TB in the buckets are not interwired. But going back...
Hi,
Got a question on bringing a multi-core control wiring from the PLC cabinet to MCC with type 2B or 2C control wiring. It says in the definition of NEMA that there is interconnection between control terminal blocks among different buckets in the MCC. Does that mean that neutral/common...
I'm pretty sure that the specs requires that all motors must be start/stop via the PLC. Totally agree with you on 95/96 contact as the EOL can communicate the OL status via the com port.
The one that I just showed was for a previous project (the one that did not use E300 communication ports, I don't know why). We wired NO contacts to the E300, one for IN2 and one for IN3, so the PLC knows if the loading spout is moving UP or moving DOWN. In the new project that I'm working on...
Hi thebard3,
Got that. That's probably the reason why we hardwired contacts in another project. But in this, we used AB E300 EOL w/o comm. ports. This one has a local disconnect switch (see attachment)...
Hi itsmoked,
Yep, it'll trip the EOL in the event of a fault but you're gonna see that when you're in front of the panel display (of the EOL), in front of the MCC. To an operator looking at the HMI in the control room how is he gonna see that? The HMI receives its signal from the PLC so, how...
Hi itsmoked,
Just to comment on this:
They series these two sets of contacts so the PLC knows the motor is running or not, regardless of the cause. Separate use of those contacts to the PLC would've shown the motor ON/OFF AND if there was a critical overload trip.
That's what we usually do...
Hi itsmoked,
The C441 EOL and its communication module are in the attachment that I uploaded (files combined in one PDF file). It also includes the vaculoader vendor drawing showing that they need ON/OFF status from the PLC.
