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Our piezo electric buzzers range from about 60 dB up to about 110 dB. Depending on the placement and the obstacles throughout the warehouse and how much general noise is in the area will call out what dB level makes most sense for you.

I have added a link to a website that has noise comparisons to give you an idea of the dB levels.

http://www.chem.purdue.edu/chemsafety/training/ppetrain/dblevels.htm   

Our 12PN series offers 120 volt operation and a continuous dB rating of 90 dB.

http://www.wolfautomation.com/products/791/120-or-240-volt-ac-buzzersbr-continuous-or-pulse-tones  

Scott Welch

Technical Sales Support

Marshall Wolf Automation is your industrial automation distributor for Piezo Electric Buzzers and more!  Check our our website at www.wolfautomation.com.  

Question:

I have a guy that needs to hang two light and three light stack Patlite units from the ceiling. The lights they currently use are modular and the modules are shaking loose and falling to the ground. What would be the best unit for mounting safely upside down?

Answer:

Actually, we don’t have a “best” industrial light tower for hanging upside down, as this mounting option is not warrantied by Patlite anyway. 

The only other assembly style we have (besides the “twist-n-click” LU5 or LU7 series) has a screw that passes through the center of the tower to hold the cap, light modules and base together. This would be any series except Patlite LU5 or LU7.

Even the screwed-down style of industrial stack light might not be foolproof, but it’s better than twist-n-click.

Also, these light towers have more light directed so they are brighter when looking “up” at them. Since they are now mounted upside down, you would be looking “down” at them (a little less light intensity).This matters less the farther away you are from the stack light.

FYI, LU5 and LU7 are not designed with this directed light intensity.

Marshall Wolf Automation is your industrial automation distributor for Patlite light towers and stack lights! 

Check out our full offering of Patlite here!

I received the following from technical support at AC Tech Lenze. He is looking at this as a backup generator that would turn on and off in certain circumstances. In your case this is our permanent power supply. Being that we do not sell generators I do not have a very good background in that area. By looking at the information below the main concern seems to be the phase to phase control coming from the generator. If the generator manufacturer can give you more detailed information on the output of the generator itself you would have to make sure we are getting what we need to maintain a smooth running AC drive/motor combination.

Although switching from line power to a backup generator is an accepted practice in many applications, there are some limitations you should be aware of pertaining to our Variable Frequency Drives. Many portable backup generators have a larger voltage swing on their phase to phase voltage input than our recommended phase to phase voltage tolerance which must be less than 2%. Although our AC Drives are equipped with surge guards in the input rectifier circuit, it may be necessary to use external protection for severe input disturbances such as surge arrestors. Larger variances cause greater ripple on the DC bus caps and this will damage them and other power components over time. Our drives need a minimum of 2 minutes between cycling of power. Otherwise it can damage the charge relay circuit or at the very least will blow the input fuses or trip the circuit breaker.

In cases where input power has “moderate” spikes in voltage which causes current surges, a 3% line reactor may help the situation.

Another solution is to add a voltage monitor with a suitable time delay. It has a protection trip level that shuts down in cases of under-voltage, over-voltage, a loss of phase and voltage imbalance between phases. This device ensures that our VFD will not see unbalanced input power or never be powered up until these other voltage tolerances and proper delay times are met.

M141000B AC Tech  100 hp 460 volt drive in a Nema 1 enclosure  $6,836.50

http://www.wolfautomation.com/Configure3.aspx?ProductID=23229&x=90&y=11

M141000D AC Tech 100 hp 460 volt drive in a Nema 12 ( oil tight dust tight) enclosure $7,473.40

http://www.wolfautomation.com/Configure3.aspx?ProductID=23229&x=90&y=11

Did this email post help you?  Let us know!

Marshall Wolf Automation is your industrial automation distributor!

Here is the customer question that came into Scott and his reply:

 'One question for you...

In setting up the braking on this...  what kind of specs do I want to use to get the fastest stopping and starting, without taxing the drive and motor? 

The motor is a Doerr 1hp, and the label shows it at a 208-230v but only shows one amp rating (expected two for the different voltages) of 3.8 amps. 

I'd really like it to slow down pretty good, but not wanting to mess with the braking resistor for the time being... so trying to figure out what I should realistically be able to do as far as Accel and Decel times and if upping the amps a little (say setting the max output to like 4 or 5 amps instead of the 3.8 that is on the data plate) might help a little one way or another and not harm the drive.

Thanks again for all the help, and you guys being faster than you thought'

Our answer: (Special note: if you need more information or have a similar question our tech department can help you as well!)

I can’t really give any values for this because it is application specific.

The key factors include:

1)            Reflected mechanical inertia from the motor

2)            Peak braking power required for stopping the motor/load and the time required from full speed to a decelerated stop.

3)            RMS power (P-rms) based on the voltage regenerated by the motor caused by this reflected inertia during braking.

1)    Ideally you need to know what the reflected mechanical inertia is from the motor. From there you can determine the average power (Pave) based on this reflected inertia.

The basic formula is Pave = KE (kinetic energy) / Tb. Tb is the required deceleration time. Smaller Tb means more average power needed to stop the load.

The KE is 0.5 * Ji * (Ws squared) where Ji is the inertial load and Ws is the synchronous speed.

2)    This is not usually an easy value to obtain. So, what typically is done is make sure the duty cycle does not exceed our ratings which are for light duty braking or 4 to 5%. This refers to the time the braking

circuit is on (Tb) vs. the complete cycle time (Tc) or duty cycle = Tb/Tc. So, if dynamic braking is on for 3-seconds during a 1 minute cycle time, the duty cycle is 3/60 =5%.

3)    The other important factor is the dynamic braking module's current limit. Fortunately the sub-micro drives can have DB modules placed in parallel to reach higher current demand. However, some care needs to be

taken to not exceed the maximum current of the connector between the drive’s and the DB module’s B+/B- terminal block.

Marshall Wolf Automation is your industrial automation distributor for a complete offering of variable frequency drives, industrial electric motors, relays, switches and much more!

'Per our discussion late yesterday, please refer to page 250 of the attached catalog section. 

There you will see our Werma 740 series of industrial stack lights that are good for hazardous locations.  We understand your coal dust application to be a Class II, Division 2, Groups F&G area. 

As we mentioned, the elements within the stack light can be interchanged to accommodate your red, yellow, and sound needs.  Keep in mind that the sounder will be much quieter in this explosion proof enclosure than in open air. 

We strongly recommend an LED light source for maintenance reasons.  For both the red and yellow colors you will need to choose the desired light effect (e.g. permanent, blinking, flashing, rotating, EVS flicker, or Ultrabright).  You mentioned that most likely Ultrabright is the one for you.  Once you make your selections we can put together the bill of material and then provide part number, price, and availability through Wolf Automation.'

Marshall Wolf Automation is your industrial automation distributor for a wide range of industrial light towers, industrial warning lights and beacons. Our technical department can help you choose the best product for your application!

Learn more about our industrial light towers now or email us for assistance on your lighting application - sales@wolfautomation.com! 
View our Werma light towers and audible alarm products here!