# Huanyang VFD - RPM is not reading correctly **URL:** \ **Category:** Spindle/VFD (Aftermarket/Unsupported)\ **Created:** [January 14, 2023, 2:01pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115 "2023-01-14T14:01:04Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![WatsonByDesign](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/watsonbydesign/32/1928_2.png) [@WatsonByDesign](https://forum.onefinitycnc.com/u/WatsonByDesign)\ **Post date:** [January 14, 2023, 2:01pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/1 "2023-01-14T14:01:04Z")
I recently completed the install of a Vevor 220v 2.2kw Water cooled spindle. I’m using a Huanyang VFD. It all seems to be working correctly but when I switch the VFD readout from HZ to RPM, the Max RPM (corresponds to 400 Hz) is around 12k, not the 24K that I’m expecting. I changed the PD143 (num poles) setting from 4 (default) to 2, but I still get a max RPM of 12k. Is anyone familiar with this issue and how to resolve it? ---
**Author:** ![Atroz](https://avatars.discourse-cdn.com/v4/letter/a/958977/32.png) [@Atroz](https://forum.onefinitycnc.com/u/Atroz)\ **Post date:** [January 14, 2023, 2:02pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/2 "2023-01-14T14:02:56Z")
Look in to the PD144 setting. ---
**Author:** ![Atroz](https://avatars.discourse-cdn.com/v4/letter/a/958977/32.png) [@Atroz](https://forum.onefinitycnc.com/u/Atroz)\ **Post date:** [January 14, 2023, 2:12pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/3 "2023-01-14T14:12:00Z")
BTW, your can pick up a digital tachometer for about $20US that will help you confirm the actual speed vs what the VFD is telling you. Good for piece of mind. ---
**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\ **Post date:** [January 14, 2023, 2:18pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/4 "2023-01-14T14:18:48Z")
Hey Tim, by using the search function of this forum and having searched for [Huanyang RPM](https://forum.onefinitycnc.com/search?q=Huanyang%20RPM) you would have found: > [@Problems installing Huanyang VFD and spindle on my Woodworker](https://forum.onefinitycnc.com/t/problems-installing-huanyang-vfd-and-spindle-on-my-woodworker/13464/5): > > Also the HY series have a setting called “rated motor revolution” at 50 Hz (PD144). Here you have to enter the RPM that your spindle would run in case it would be driven with a frequency of 50 Hz (even if this is outside the allowed range for the spindle). You calculate this according the same formula above: > > 50 Hertz × 2 × 60 seconds / 2 poles = 3,000 rpm > > - So here you got to set PD144 to “3000”. or: > [@Spindle running at half speed](https://forum.onefinitycnc.com/t/spindle-running-at-half-speed/1030/8): > > If you spindle motor is rated to spin at up to 24,000 rpm then look in your VFD Manual for PD144 settings. It should be listed as “Rated Motor Revolutions” and most likely shows the default setting is 1440. If so then change the setting for PD144 to 3000. That will enable your spindle rpm to max out at 24,000 rpm. With the default setting of 1440 your spindle is only running at around12,000 rpm when maxed out. ---
**Author:** ![charleyntexas](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/charleyntexas/32/118_2.png) [@charleyntexas](https://forum.onefinitycnc.com/u/charleyntexas)\ **Post date:** [January 14, 2023, 2:43pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/5 "2023-01-14T14:43:38Z")
Also check PD settings for PD003,PD004,& PD005. They should all be set to 400htz. If not set them in reverse order starting with 5 then 4 then 3. ---
**Author:** ![WatsonByDesign](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/watsonbydesign/32/1928_2.png) [@WatsonByDesign](https://forum.onefinitycnc.com/u/WatsonByDesign)\ **Post date:** [January 14, 2023, 3:06pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/6 "2023-01-14T15:06:44Z")
Set PD144 to 3000 and now max RPM is reading 24000 as expected. Thanks. ---
**Author:** ![WatsonByDesign](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/watsonbydesign/32/1928_2.png) [@WatsonByDesign](https://forum.onefinitycnc.com/u/WatsonByDesign)\ **Post date:** [January 14, 2023, 3:10pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/7 "2023-01-14T15:10:24Z")
Thanks Charley. PD003, PD004, PD005 are all set to 400. Question, how do I know what PD143 (num poles) should be set to. The default is 4. I have a cheap devour spindle and have no information to go on. ---
**Author:** ![blaghislain](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/blaghislain/32/33736_2.png) [@blaghislain](https://forum.onefinitycnc.com/u/blaghislain)\ **Post date:** [January 14, 2023, 3:15pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/8 "2023-01-14T15:15:30Z")
Check PD072 and PD144 also. [Here](https://forum.onefinitycnc.com/t/information-to-build-you-own-onefinity-companion-control-box/2647/21) is a reference point (need to be adjust for 220v) ---
**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\ **Post date:** [January 14, 2023, 3:41pm UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/9 "2023-01-14T15:41:12Z")
Hey Tim, > [@WatsonByDesign](#): > > Question, how do I know what PD143 (num poles) should be set to. The default is 4. I have a cheap devour spindle and have no information to go on. 1. you can measure the currents the spindle produces if you turn it manually. Every induction motor is an induction generator. You can connect a multimeter which is set to 200 V DC between two of the three phase pins and turn the spindle manually. If you get one positive and one negative pulse value per turn, it has two poles. With four poles, you would get double the number of positive and negative pulses per turn. Here you see a diagram of a three-phase induction motor, at left with two magnetic poles and at right with four magnetic poles: > [@Cutting thin gauge steel](https://forum.onefinitycnc.com/t/cutting-thin-gauge-steel/14206/3): > > * * * > > Pole pairs on [three-phase asynchronuous induction motors](https://en.wikipedia.org/wiki/Induction_motor): > > | > > ![Polpaar_zahl_1](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/6/6086785372ce9129795acf499808126e55161d63.svg) > [Biezl](https://commons.wikimedia.org/wiki/File:Polpaar_zahl_1.svg), Public domain, via Wikimedia Commons > > | > > ![Polpaar_zahl_2](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/e/1/e1b8b1801a4ebad739f986c7f368c0a14009b4b2.svg) > [Biezl](https://commons.wikimedia.org/wiki/File:Polpaar_zahl_2.svg), Public domain, via Wikimedia Commons > > | > | 2 magnetic poles (1 pole pair) | 4 magnetic poles (2 pole pairs) | > | --- | --- | 1. You can deduce it from rated rpm and frequency. If your seller tells you it is rated 24,000 rpm at 400 Hz, you can calculate the number of magnetic poles back: So if you know how fast a spindle runs at a specific frequency (e.g. 24,000 rpm at 400 Hz), you do: [$SPINDLE\_NUMBER\_OF\_POLES](https://commons.wikimedia.org/wiki/File:Polpaar_zahl_1.svg) = [$VFD\_FREQ](https://en.wikipedia.org/wiki/Variable-frequency_drive) × 2 × 60 / [SPINDLE\_RPM](https://en.wikipedia.org/wiki/Induction_motor#Synchronous_speed) 400\*2\*60/24000 = **2** poles 1. You can deduce it from price. Spindles with four poles are more expensive, e.g. > [@Lower speed high torque spindles](https://forum.onefinitycnc.com/t/lower-speed-high-torque-spindles/18089/2): > > comparing e.g. 2-pole [HFS-8022-24-ER20](https://www.spindel-shop.de/en/High-Frequency-Spindle-standard-Series/High-Frequency-Spindle-HFS-series/Water-Cooled-HF-Spindles--HF-Spindle--HF-Spindles--HF-Spindle--HF-Spindles--Motorspindle--Milling-Spindle--Grinding-Spindle-4.html) ([Datasheet](https://www.mechatron-gmbh.de/fileadmin/user_upload/Datenblatt_HFS-8022-24-ER20.pdf)), 0.9 Nm constant torque from 6,000 – 24,000 rpm, to 4-pole [HFPM-8022-24-ER20](https://www.spindel-shop.de/en/high-frequency-spindles--Professional-Series/high-frequency-spindles-hfp-m-series/product-192-195-196-200.html) ([Datasheet](https://www.mechatron-gmbh.de/fileadmin/user_upload/Datenblaetter_2019/Datenblatt_HFPM-8022-24-ER20.pdf)), 1.6 Nm constant torque from 3,000 – 12,000 rpm ---
**Author:** ![JoshL](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/joshl/32/31049_2.png) [@JoshL](https://forum.onefinitycnc.com/u/JoshL)\ **Post date:** [December 10, 2024, 4:46am UTC](https://forum.onefinitycnc.com/t/huanyang-vfd-rpm-is-not-reading-correctly/18115/10 "2024-12-10T04:46:42Z")
Does anyone know how to change the VFD readout from HZ to RPM on a GT series?