equipment power
equipment power
(OP)
I have a 208Y/120 panel with a 15A circuit supplying power to a chiller. The L1,L2,L3 voltage readings at the chiller are 243,242,245V. I'm a little rusty on my electrical... 1.How am I getting 240V on a 208Y/120 feed?
2.The chiller nameplate says 220V. I should be OK with the above measured voltages, right?
2.The chiller nameplate says 220V. I should be OK with the above measured voltages, right?





RE: equipment power
The nameplate means little.
RE: equipment power
Your chiller motor can handle running at these higher voltages (+-10%). However, you may be losing a small amount of efficiency by way of increased current draw since you are operating at a higher than nameplate volts. Assuming the load is constant.
Does this panel feed other equipment that may be located a ways away (high tap setting so downstream devices don't see to low a voltage)?
RE: equipment power
"Venditori de oleum-vipera non vigere excordis populi"
RE: equipment power
At least the above example is only a 5% overvoltage. Yours is a much higher 17%.
I too would be curious to see what happened to voltage both at the panel and at the chiller when the chiller is run loaded.
Also, my understanding is that motors generally prefer overvoltage to undervoltage (lamps, by contrast, prefer undervoltage). Any comments on that?
RE: equipment power
Since his motor is 220V then is motor is seeing under a 10% voltage increase(110% of 220 is 242V). Although if other equipment is connected on the same feed then this high voltage could be causing problems with this other equipment.
RE: equipment power
Off topic a little, but 242V ø-ø corresponds to almost 140V ø-n(!)
RE: equipment power
Have you confirmed the transformer is wired for 208/120? Maybe some retrofit happened and things were rewired at some point in time.
RE: equipment power