NomadicOwl
Electrical
Attached is the image of oil Sump Heater for 700HP Siemens Motor. Could anyone please explain me the diagram and how to connect it to power supply.
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Induction Motor Oil Sump Heater Connection
- Thread starter NomadicOwl
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Attached is the image of oil Sump Heater for 700HP Siemens Motor. Could anyone please explain me the diagram and how to connect it to power supply.
There are three (single phase) heating circuits shown.
Circuit #1: (H1-H2-H3) is the main anticondensation heater circuit for the machine, and each heating element (indicated by the squiggly resistor symbol) sees 120 V. This requires that there is either a 120 V supply connected across the heating elements (H1-H2 gets 120, H2-H3 gets 120), OR 240 volts is supplied across H1-H3 with H2 left OPEN (NOT grounded!).
Circuit #2: (SH1-SH2) is the bearing sump heater at one end of the machine. Supply 120 V across SH1-SH2.
Circuit #3: (SH3-SH4) is the bearing sump heater at the other end of the machine. Supply 120 V across SH3-SH4.
Alternatively - jumper SH2-SH3. Then apply 240 V across SH1-SH4.
Converting energy to motion for more than half a century
Circuit #1: (H1-H2-H3) is the main anticondensation heater circuit for the machine, and each heating element (indicated by the squiggly resistor symbol) sees 120 V. This requires that there is either a 120 V supply connected across the heating elements (H1-H2 gets 120, H2-H3 gets 120), OR 240 volts is supplied across H1-H3 with H2 left OPEN (NOT grounded!).
Circuit #2: (SH1-SH2) is the bearing sump heater at one end of the machine. Supply 120 V across SH1-SH2.
Circuit #3: (SH3-SH4) is the bearing sump heater at the other end of the machine. Supply 120 V across SH3-SH4.
Alternatively - jumper SH2-SH3. Then apply 240 V across SH1-SH4.
Converting energy to motion for more than half a century
NomadicOwl,
What Gr8blue is expaining is correct. However, regarding the space heaters connection just note the 120 V is a parallel connection (4 resistance connected in parallel)and the equivalent resistance is R/4; for 240 V connection the equivalent resistance is R (resistances connected in series - parallel).
Because Watts = V squared/R then R= V squared /Watts. For 400 Watts and 240 V we have a Resistance of (240*240) /400 = 144 Ohms and for the 120 V connection R= 144/4 = 36 Ohms and same 400 Watts = (120*120)/36 = 400.
Best Regards and Happy New Year.
Petronila
What Gr8blue is expaining is correct. However, regarding the space heaters connection just note the 120 V is a parallel connection (4 resistance connected in parallel)and the equivalent resistance is R/4; for 240 V connection the equivalent resistance is R (resistances connected in series - parallel).
Because Watts = V squared/R then R= V squared /Watts. For 400 Watts and 240 V we have a Resistance of (240*240) /400 = 144 Ohms and for the 120 V connection R= 144/4 = 36 Ohms and same 400 Watts = (120*120)/36 = 400.
Best Regards and Happy New Year.
Petronila
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