We have a 12 lead mtr. For a fire pump . Voltages on name plate 200/400. We're being told it can be hooked up to a Straight 208 vOLT 3 PHASE. One Starter/ Wiring diagram on mtr shows Start y Run Delta. 20 hp. anyone ever run into this???
From a liability standpoint for building-fire protection, it may be a serious mistake not to have specific documentation that the starting method called out by the pump manufacturer is unambiguously provided but the fire-pump controller, with the two correctly interconnected.
If the fire pump is intended for reduced-voltage starting, a controller providing only full-voltage starting may be a critical misapplication.
I believe the point of which Bjarney is referring to (reply covering the Wye / Delta starting intentions of the Motor and the possible liability involved with misapplication), would be critical issue to the design and application of this particular Motor/Pump assembledge.
In other words, if the connected Pump has something similar to excessive head pressure (per an Air Compressor's Pump at start without "dumping" the pressurized air between cylinder and tank), the Motor may either stall / continuous Locked Rotor scenario, or draw excessive Current for an excessive time period - both of which will cause one or both of the following: <OL TYPE=A>
[*] Overcurrent device trip,
[*] Huge volumes of Smoke loss from Motor's windings. </OL>
I can see the Lower Voltage (Wye Connection) starting means allowing the Pump to get things flowing enough to allow full speed / line voltage connection of Motor to enable without the effects of "A" and/or "B" above.
***DISCLAIMER*** I am probably wrong about the starting intentions, along with Bjarney's reply, so feel free to flame away at me if above information is indeed bunk!
Just my 2¢
edited to fix bad HTML tagging ... Bad tag!!! go sit in the corner!!!
[This message has been edited by Scott35 (edited 01-08-2005).]
Scott " 35 " Thompson Just Say NO To Green Eggs And Ham!