Comments on: Atlantic City Convention Hall Midmer Losh Blower Startup

By: midmer455

midmer455 — Mon, 10 Aug 2009 03:12:58 +0000

THe 100 inch is 50 …
THe 100 inch is 50 HP, the others are 75 HP and 100 HP. They start up on Westinghouse variable frequency starters. There are 7 blowers total of 600 HP. There is a 5 HP motor for the DC generator, 143 Amps at 14 Volts. The Kimball has a 30 HP motor for the primary Spencer blower and a 5 HP motor for the booster blower for the tuba. The Kimball power supply is solid state.

By: johntdso

johntdso — Mon, 10 Aug 2009 03:12:58 +0000

The sounds you hear …
The sounds you hear are the motors being started across-the-line. The 100 inch blower motor is a 2 pole 3 phase motor probably 60 or 75 HP 3 phase operating at 3550 RPM. The other 2 motors are probably 75 or 100 HP and run about 1775 RPM. The long windup is due to the mass inertia of the blowers themselves.

By: advisorC101

advisorC101 — Mon, 10 Aug 2009 03:12:58 +0000

Amazing!
Amazing!

By: finfred

finfred — Mon, 10 Aug 2009 03:12:58 +0000

Actually, the ” …
Actually, the “torque converters” simply vibration isolators common in such installations. Modern solid state motor controllers for three phase motors allow you to
adjust the start-up rate and final run rate by
varying the frequency of the AC being fed into
the motor.

By: Orgelduedler

Orgelduedler — Mon, 10 Aug 2009 03:12:58 +0000

I maybe mixed …
I maybe mixed something up with that. But it is just enormous to hear that big electric engines.

By: spootyrat

spootyrat — Mon, 10 Aug 2009 03:12:57 +0000

Being fed into …
Being fed into these blowers would give you a very bad day.

By: midmer455

midmer455 — Mon, 10 Aug 2009 03:12:57 +0000

The original motors …
The original motors were DC. A lot of the hall was DC when built. There were rotary converters in the Hall.

By: midmer455

midmer455 — Mon, 10 Aug 2009 03:12:57 +0000

Fortunately, the …
Fortunately, the Hall is very solid and there is no real floor vibration. No lightning issues at the hall. The primary blower room is actually under the stage. The others are spread throught the hall. The blowers are started by a motor starter panel next to the main console. They can be individually started in each blower room.

By: midmer455

midmer455 — Mon, 10 Aug 2009 03:12:57 +0000

We used the 64ft …
We used the 64ft last week during a tour. No, the hall does not shake and it you do not feel sick. Work is progressing on both organs. The new Peterson relay for the Kimball is being wired in to the chambers and we may be able to use it with a laptop and midi before the console is returned from rebuilding. The ML in the arena has, in addition to the 64′ 10 32′ stops. You will feel wind from the mouth of the very large pipes when the are played. The 64′ is on 35 inches of wind.

By: KE5RHD

KE5RHD — Mon, 10 Aug 2009 03:12:57 +0000

I used run a 1 M …
I used run a 1 M gallon municipal pool and those look much like our pump motors. I can imagine what it feels like standing near them as the cement floor literally shakes you up to your eyeballs. We had lightning issues being at the top of a mountain so we had huge isolation capacitors. It phased the circuits by discharging the capacitors in sequence. Prior to installing the TPI units, we would loose function with the smallest power glitch. Not good if you need to turn 1M gallons in 8 hours.