Issue with the H2C High Pitch Squeal after the Bambu Handy Slicer software sends the job to the printer, and the printer starts, tests before printing
The H2C is plugged into a CyberPower 1500VA AVR (UPS) purchased from Costco in Canada. It’s plugged into the Surge-Battery side.
Note Results (Plugged into Surge Battery Side of UPS
Prior to the squeal (Load Capacity), LC is at 1 Bar / 5, the Output is at 10-35KW %
When the squeal starts, the LC goes to (full), and the Overload circuit light is illuminated. The Output goes from say 10% KW to 142KW %.
Test 2 Plugged directly into the wall, no squeal, but no protection from surge or power failure
Test 3 Plugged in to the UPS Surge side only, no squeal, no protection from power failure, but is protected from power surge
Test 4 Plugged back into Surge - Battery side and was noted in by another person in this feed to turn on the “Low Power Mode,” which is located under the settings menu. This will cause the chamber and heat-bed to warm up slower and NO SQUEAL, AND PROTECTION NOW
Awesmome
hm. not really. I suspect the ramp up of power by the printer is pushing the limits of what the cyberpower UPS can deliver. The printer’s max power on 110V is 1250W, where as the Cyberpower can deliver up to 900W @ a nominal 120V. Given the normal run state for the printer is ~200W @110 for a single nozzle, using the low power settings reduces the strain on the UPS, and lengthens the curve of 0 to XXX watts to within it’s performance characteristics.
I’ve had lots of debates with folks about UPS’s over the years, and yah, you can run based on what your server’s average load looks like, but can you handle surges to max power draw? When I can, I like to size to that.
That printer’s max ability to consume power outstrips the UPS’s ability to deliver. I’d scream too if you asked me to go from doing nothing to having to suddenly lift well above my weight class (whatever it may be).
If you were going to stick with CyberPower - and their costing is generally attractive for home users, the PR1500LCD, or the PR1500LCDN can deliver up to 1500 W of output power, and would not likely scream. Of course you could look at Vertiv or Scheider Electric’s APC line as well.
I do have my CR10 Smart Pro plugged into an APC Back-UPS XS 1300, and it only delivers 780W, and the printer caps out at ~350w max power draw… so I’m good for a few minutes at least. (my RPi print server is plugged into the same unit (I think!)) so, hopefully things will pause gracefully, and let me resume if there’s a power failure. Though I may need to use Loosenut’s idea of scotch tape to hold the print down once the bed’s cooled to room temp before resuming.
Of course others mileage may vary!
do you have yours plugged into a ups, with battery and surge protection with an h2c?
I don’t have an H2C but a p1s (2) and p2s prusa xl , snap maker, and an MK3s+. All are in 1400w ish (cyber power and APC) They all seem fine no issues. If the power fails during a print I get 10 mins maybe. I have a lot of 1-2 second power failures so the UPS help a lot.
so the answer simply came down to changing the setting in the h2c to low power mode which only affected the initial heating of the bed and chamber but didnt impact preformance!