Protection Options & Alarms Offered for Fan Products

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om_tech_support_JT
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Protection Options & Alarms Offered for Fan Products

Post by om_tech_support_JT » Mon May 23, 2016 9:24 am

Q: I have an application where I need consistent airflow to cool some metal components that I manufacture. The fans I use often slow down over time thus decreasing airflow. This lower airflow adversely affects my components since it won't provide the cooling I need, and I have to scrap the metal components and order new fans while dealing with down time. What kind of alarms or protection options do you offer for your fan products to eliminate this issue for me?

A: Our fan products do feature a variety of alarms and protection functions to help minimize downtime. We offer fans with impedance protection, overheat protection, low speed alarms as well as stall alarms in both electronic or contact type to fit your needs. Impedance protection and overheat protection prevents damage to the fan motor while the speed alarms ensures the performance you expect and allows planning of replacements more efficiently.

For your low fan speed issue, we would suggest looking at our fans with either low speed, stall alarms, or pulse sensor output. Fans with low speed alarms outputs an alarm signal when the fan speed drops to a certain level due to either end of life or ingress of foreign objects. Fans with stall alarms output an alarm signal when the cooling fan stops. Pulse sensor output type fans output digital square waveform pulse signals at a certain frequency (2 pulses per revolution of the fan motor). By using a pulse sensor output, the user can customize the type of alert according to their specific preference. The fan that needs to be replaced is also quickly identified with these alarms. These types of alarm are offered on MRS and MRE series AC axial flow fans, MDS and MDA series DC axial flow fans, MBD series DC centrifugal blowers and MFD series DC cross flow fans.
Fan protection options - fans with low speed alarms.jpg
Fan protection options - fans with low speed alarms.jpg (163.56 KiB) Viewed 15482 times
EXAMPLE:
Fan protection options - low speed alarm specifications.jpg
Fan protection options - low speed alarm specifications.jpg (96.4 KiB) Viewed 15482 times
Fan protection options - fans with stall alarms.jpg
Fan protection options - fans with stall alarms.jpg (76.15 KiB) Viewed 15482 times
EXAMPLE:
Fan protection options - stall alarm specifications.jpg
Fan protection options - stall alarm specifications.jpg (111.34 KiB) Viewed 15482 times
Fan protection options - fans with pulse sensor output.jpg
Fan protection options - fans with pulse sensor output.jpg (54.99 KiB) Viewed 15482 times
EXAMPLE:
Fan protection options - pulse sensor specifications.jpg
Fan protection options - pulse sensor specifications.jpg (112.31 KiB) Viewed 15482 times
We also offer fans with overheat protection. If a fan in operation locks due to overload, ambient temperature rising too rapidly, or the input current draw rises abruptly, the fan's temperature will rise abruptly. If the fan is left in this state, the performance of the insulation within the fan may deteriorate, reducing its life. In extreme cases, it might even cause a fire. To prevent this, our fans which are recognized by UL and CSA standards and conform to EN and IEC standards offer built-in overheat protection. Depending on the type of the fan, either thermal protection or impedance protection is offered.
Fan protection options - fans with overheat protection.jpg
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Impedance protection is offered on the MU and MB series axial flow fans. These fans have higher impedance in the fan windings so even if the fan locks, the typical increase in current draw is minimized and as a result also limits the temperature rise at a certain level.

Thermal protection is offered on MRS series axial flow fans, MB series centrifugal blowers, as well as the MF series cross flow fans. If the temperature of the fan rises above a certain level, the thermal protection cuts off power to the fan motor therefore allows it to cool down. When it cools beyond a certain level, it will allow the fan to operate again. Inside our thermal protector, we use a bimetal contact with different heat properties in the power circuit. As the bimetal contact senses an abnormal rise in temperature, it will bend until power is disconnected from the fan motor windings. Please see an image below.
Fan protection options - operating temperature of thermal protector.jpg
Fan protection options - operating temperature of thermal protector.jpg (62.55 KiB) Viewed 15482 times
With our DC fans, we offer a "burnout prevention circuit" which cuts power to the motor windings or limits the current when the fan motor is locked.

For more information about our fan products, please visit the following pages:
WEB FAN OVERVIEW: http://www.orientalmotor.com/products/a ... index.html
CATALOG OVERVIEW: http://www.orientalmotor.com/products/p ... erview.pdf
FAN ALARM SPECIFICATIONS: http://www.orientalmotor.com/products/p ... _specs.pdf
TECHNICAL REFERENCE: http://www.orientalmotor.com/products/p ... roduct.pdf
TYPICAL FAN APPLICATIONS: http://www.orientalmotor.com/applicatio ... ml#cooling (scroll all the way down)

If you have any questions, please contact our knowledgeable technical support group to discuss your application.

PHONE 800.468.3982
E-MAIL [email protected]
CHAT http://www.orientalmotor.com

Mr.Thota
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Location: New Jersey

Re: Protection Options & Alarms Offered for Fan Products

Post by Mr.Thota » Sat Jun 27, 2020 4:49 am

Hi !!
Good Day !!

We have gone through the above information, still, we have a bi confusion.
How to give the connection for alarm for T-MRS18-TTM-G, please provide us wiring details.
Also, will get it the 24 VDC from the fan when any abnormal condition ??
Please Clarify the 5v and 0v DC supply as per the attached diagram.

We required an alarm output from the fan, which we will take to our PLC for another program.
Requested to please provide us hand sketch of wiring diagram to proceed further in this matter.
Attachments
diagram.png
diagram.png (9.59 KiB) Viewed 1278 times

om_tech_support_KR
Posts: 102
Joined: Thu Jan 11, 2018 3:03 pm

Re: Protection Options & Alarms Offered for Fan Products

Post by om_tech_support_KR » Mon Jun 29, 2020 1:58 pm

Hello,

The diagram referenced would only be for the MRS14-TTM fan. The fan used in your kit is the MRS18-TTM. The alarm output would be open collector type so you will have to supply a voltage to it to read the output. You can use up to 30 VDC and the current will have to be limited to 15 mA with resistors. The alarm output will turn on when speed falls to 1800 ± 300 r/min.

Mr.Thota
Posts: 36
Joined: Tue Oct 02, 2018 9:45 pm
Location: New Jersey

Re: Protection Options & Alarms Offered for Fan Products

Post by Mr.Thota » Wed Jul 01, 2020 1:25 am

Hi,
Good Day !!

Thank you for your reply.

Does it mean we need to give the black wire to 0 and orange wire 24/30V DC ??

If it is like this, how could we get an output signal from the fan ??
what is voltage output (from a fan) shall we get it ???
because we required this output signal to our PLC ?? (please clarify)

How it would be detecting a signal from fan to PLC ??

If possible, mention the wiring diagram and send it please....

thanking you and Best REgards,

om_tech_support_KR
Posts: 102
Joined: Thu Jan 11, 2018 3:03 pm

Re: Protection Options & Alarms Offered for Fan Products

Post by om_tech_support_KR » Thu Jul 02, 2020 10:52 am

Hello,

Correct you will have to supply voltage to the orange and black wires. To read the signal you will have to wire your PLC in series if you are sourcing power from a power supply and not your PLC. When an alarm is present you will read out the voltage you are inputting from your power source either 24/30 VAC depending on what you use. Also remember a resistor will be needed to limit current to 15 mA max. The wiring diagram below would be if your PLC is supplying the voltage to the fan.

https://catalog.orientalmotor.com/Asset/alarm2.jpg

Mr.Thota
Posts: 36
Joined: Tue Oct 02, 2018 9:45 pm
Location: New Jersey

Re: Protection Options & Alarms Offered for Fan Products

Post by Mr.Thota » Wed Jul 08, 2020 5:08 am

Hi !!
Good Day !!

We understand that there are two individual cables for alarm, that is black and orange, and in this Black is 0V and Orange is 24/30V right ??
It means we should provide external 0~30VDC sourcing power supply to black and orange right ??
For reading fan alarm signals to PLC, which wire we need to be connected to PLC ??

If possible, please send us a hand sketch diagram for us to understand.
We are getting confused about this alarm signal, please support us.

om_tech_support_KR
Posts: 102
Joined: Thu Jan 11, 2018 3:03 pm

Re: Protection Options & Alarms Offered for Fan Products

Post by om_tech_support_KR » Thu Jul 09, 2020 7:09 am

Hello,

Correct you will need to supply external power supply up to 30 VDC to black and orange wires as these don't output any voltage. Below is a sample wiring diagram from another one of our drivers but it is also open collector type for the outputs. The outputs would be Y0 and Y1 there is a sample sink and source wiring diagram. Note this driver current is 100 mA or less on your MRS18-TTM this will need to be limited to 15 mA or less.

Sample wiring.PNG
Sample wiring.PNG (93.19 KiB) Viewed 1209 times

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