Electronics > Beginners

my cook top hates my heatpump?

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GerryR:

--- Quote from: JustMeHere on October 30, 2019, 01:28:36 am ---You might want to check your grounds.   Make sure your AC ground is good back to the panel.    A ground loop could cause problems.   If you have an AM radio you can plug into your stove's circuit, see if you hear any more noise when the AC is running.

--- End quote ---

I'm with JustMeHere; my bet is on bad grounding.  I had a friend that had a separate panel put in a room for a washer and clothes dryer.  When using the dryer, the kitchen stove and oven did strange things.  When I tested between grounds, there was a major voltage difference.  Once I tied the grounds together back in the panel, the problem went away.  These were 220 VAC circuits.  Just a guess.

inductive:


--- Quote from: inductive on October 29, 2019, 08:32:11 pm ---

Was the heat pump a replacement item or an addition/change over?  Did you have an AC unit that didn't do this?  I'd think a 4 year old induction cooker would be adequately filtered for normal conditions.   These are the kinds of problems that popped up 30/40 years ago that delayed electronics being introduced more quickly.

--- End quote ---

heatpump was bought new, as a replacement for an old oil-furnace from 1970. never been AC in the house (don't need much, its winter here 10months of the year)

--- Quote from: JustMeHere on October 30, 2019, 01:28:36 am ---You might want to check your grounds.   Make sure your AC ground is good back to the panel.    A ground loop could cause problems.   If you have an AM radio you can plug into your stove's circuit, see if you hear any more noise when the AC is running. 

--- End quote ---

good call. that is something that should be tested.

on a side note. the powerwires for the heatpump (both indoor unit and outdoor unit) are both new, installed when the pump was installed. however, the powerwire to the cooker is the old one from 1979. (3x4mm2, 20A breaker)


--- Quote from: GerryR on October 30, 2019, 11:49:28 am ---
I'm with JustMeHere; my bet is on bad grounding.  I had a friend that had a separate panel put in a room for a washer and clothes dryer.  When using the dryer, the kitchen stove and oven did strange things.  When I tested between grounds, there was a major voltage difference.  Once I tied the grounds together back in the panel, the problem went away.  These were 220 VAC circuits.  Just a guess.

--- End quote ---

i've only got one panel. all grounds are grounded to the same lug. which then has a wire going outside to a "ground spear" which is buried into the ground


--- Quote from: Monkeh on October 30, 2019, 04:00:02 am ---It's an IT system. I'm not experienced with their installations, but there may not even be a ground.

--- End quote ---

i believe norway is among the last countries that still uses IT. and its prone to have grounding issues.. however none of the RCD's have ever tripped (RCD in every breaker)

and another sidenote. most outlets are ungrounded. only basement outletes/kitchen/bathroom are grounded. rest is ungrounded. but they don't cause me any trouble

Jeroen3:
An RCD won't trip in an IT system. That's the whole advantage of the IT system.
Very nice for high continuity. And very bad for noise if the impedance of the transformer is high.

Go rent a power harmonics meter and measure what you got.

ogden:
What is nominal power of your mains feed? 16KW (!) pump is quite a load load for single phase rural power line. First obvious thing to do - measure AC voltage while pump is running.

Monkeh:

--- Quote from: ogden on October 30, 2019, 02:51:58 pm ---What is nominal power of your mains feed? 16KW (!) pump is quite a load load for single phase rural power line. First obvious thing to do - measure AC voltage while pump is running.

--- End quote ---

16kW heat pump. That's the heat transfer rating, power consumption should be just over 4kW, maybe edging over 6kW in the worst case. Not particularly scary.

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