I agree with Dave,
The 240V connection will draw less current which could mean lower losses, however it really depends on what you have available. If the motor is designed for 120 or 240, then either will work. I also agree that the bearings would be the first thing to wear out before windings do.
The controller which supplies the 5 independent 4-20mA control circuits were originally connected to a common DC ground (designed to minimize the need to run 10 control wires, and instead only run 6 control wires). This was scrutinized as a potential source of the noise which could have been...
An independent review of the system was performed by a fellow electrical engineer. There were no wiring or configuration issues found. Additionally, all wiring was checked for tightness (I know that loose terminals can affect operation drastically).
Yes, thank you all for you feedback and input! I am hoping that this issue might provide me with a learning experience as well. I have never encountered an issue such as this and look forward to finding a root cause.
Right now I am doing testing to create additional magnetic/EMI noise in the...
Yes, that is where I am currently at. I am going with Chromalox SSR1P-2511 type SSRs. They seem to have less "intelligence" packed into the control circuit design so I am hoping they are more reliable. Even if I don't end up seeing the fault after 2-3 weeks with these new SSRs, I still won't...
Again that is just my SWAG, but I am hoping that some of you fine engineers and physicists might be able to give be better insight on this theory. Given that there is no neutral conductor I am wondering about circulating currents due to the delta connection that is made when all 5 zones are...
SSR-B and SSR-D are both the PMP2450 versions with larger heat sinks. Temperature was measured using a thermal imager and the temperature on any of the heat sinks at full power or during steady state/PID control were never above 32C.
In reaching out to Crydom for technical support, they...
Here is the current setup/schematic for the AC power system.
Each of the SSRs are driven by their own dedicated 4-20mA control signal and each varies depending on the temperature at the heater. The goal is to control power to the heaters to maintain a set temperature. There are only 3...
How are the 3 heaters in phase L3-L1 wired up? Series, Parallel? Parallel
Any unbalanced 3 phase system has positive, negative and zero sequence components. You can calculate the magnitudes. Have you done that? No, I have not
How are you seeing harmonics? Using the power data logger, the...
I have 3 of the following current transformers clamped around each of the 3 phase feeder lines.
https://shop.dentinstruments.com/products/hinged-current-transformers
The SSRs have a time base control as you said, similar to duty cycle control for controlling average power over time.
4mA (0%...
A zero-cross detector is an integral function to SSRs which drive them to switch their output when the incident voltage is at the 0V point. This is done to help minimize harmonics. SSRs can also be controlled via phase angle, which is similar to a shutter effect. Phase angle control tends to...
I have a 3 phase problem that I think might be applicable to this forum. The setup is equipment which contains 5 resistive heaters (A through E). The unit is powered by 208V 3 phase and each of the heaters are hooked up line to line in an unbalanced configuration as follows:
L1-L2: Heater D...