# Circuit of The accelerometer and the module X20CM4800X **URL:** \ **Category:** Controls & Vision\ **Tags:** x20\ **Created:** [June 6, 2025, 6:35am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222 "2025-06-06T06:35:33Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Yacine](https://avatars.discourse-cdn.com/v4/letter/y/FF8800/32.png) [@Yacine](https://community.br-automation.com/u/Yacine)\ **Post date:** [June 6, 2025, 6:35am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/1 "2025-06-06T06:35:33Z")
Hello guys, I would like to ask you for clarification regarding the connection between my accelerometer and the X20CM4800X module. The accelerometer cable I am currently using has only two wires: - **Red wire** : connected to IEPE+ / signal - **Blue wire** : connected to 0V - Additionally, there is a **grey shielding wire** that I connected to close the circuit. However, according to the X20CM4800X datasheet, the module expects a 3-wire connection: IEPE+, IEPE−, and shield. ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/c/ccfc32a76dfee98c16fbfb433a0b4644564ae99e.jpeg) The issue is that the module indicates a broken wire. I would like to know if it is possible to connect my accelerometer to the X20CM4800X module, and if so, how should I proceed to do it properly? ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/4/434b57857e7ab4b352995b423d1a786e500d322b.png) ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/2/2c06e2278dd8be79768a5c5688e86f8bb95d6ac2.png) ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/d/df786ba42b9a4bd962c4b05101b6862178ae3d15.jpeg) ---
**Author:** ![christoph.hilchenbac](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/christoph.hilchenbac/32/423_2.png) [@christoph.hilchenbac](https://community.br-automation.com/u/christoph.hilchenbac)\ **Post date:** [June 6, 2025, 7:26am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/2 "2025-06-06T07:26:32Z")
Unfortunately, I have no knowledge of this type of measurement, but I’ll just try to understand the documentation. - There is an [internal circuit diagram](https://help.br-automation.com/#/en/4/hardware%2Fx20cm4800x%2Feingangsschema.html) for the module ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/7/7dab505ca7a6aa6b5b51f1e32c0218aa13247438.png) According to [Wikipedia](https://en.wikipedia.org/wiki/Integrated_Electronics_Piezo-Electric) this kind of sensors need a power supply, which this module can provide (but can be switched off by application). - does the sensor work with the provided Milliamps ? (Datasheet) - then the [technical data](https://help.br-automation.com/#/en/4/hardware/x20cm4800x/technische_daten.html) describe how the open circuit detection works: ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/7/71eec83e4a67a0d8e2c7929220136c494c9389c4.png) so one can check the voltage. -then I would still have concerns about the pin naming ‘GND’ instead of ‘IEPE-’. ‘GND’ implies that there is a grounding to the housing (?) whereas IEPE+/- expect a floating (groundless) sensor input. ---
**Author:** ![Yacine](https://avatars.discourse-cdn.com/v4/letter/y/FF8800/32.png) [@Yacine](https://community.br-automation.com/u/Yacine)\ **Post date:** [June 6, 2025, 7:39am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/3 "2025-06-06T07:39:06Z")
This is the electrical data of my accelerometer. ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/5/5061717b8a118655f8b03e4a8bd4330744d519cb.png) my module provide 5mA/24VDC like a supply power. and the accelerometer had an excitation voltage between 18-28VDC, constant current excitation between 2 and 20mA. the probleme is that the module write that there is a Broken Wire and i don’t know the reason. Thank you for helping. ---
**Author:** ![christoph.hilchenbac](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/christoph.hilchenbac/32/423_2.png) [@christoph.hilchenbac](https://community.br-automation.com/u/christoph.hilchenbac)\ **Post date:** [June 6, 2025, 7:50am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/4 "2025-06-06T07:50:31Z")
what voltage did you measure between A+ and A- input of the module by using a multimeter ? ---
**Author:** ![Yacine](https://avatars.discourse-cdn.com/v4/letter/y/FF8800/32.png) [@Yacine](https://community.br-automation.com/u/Yacine)\ **Post date:** [June 6, 2025, 7:56am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/5 "2025-06-06T07:56:43Z")
I didn’t try to mesure it, but based on this circuit is 5 mA. ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/1/123aa247ae8480a8822fc46975e4fb07c79d3a4d.png) ---
**Author:** ![christoph.hilchenbac](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/christoph.hilchenbac/32/423_2.png) [@christoph.hilchenbac](https://community.br-automation.com/u/christoph.hilchenbac)\ **Post date:** [June 6, 2025, 7:59am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/6 "2025-06-06T07:59:09Z")
> [@Yacine](#): > > I didn’t try to mesure it what is the problem ? the pins are accessible according to your photo above 🙂 ---
**Author:** ![Yacine](https://avatars.discourse-cdn.com/v4/letter/y/FF8800/32.png) [@Yacine](https://community.br-automation.com/u/Yacine)\ **Post date:** [June 6, 2025, 8:32am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/7 "2025-06-06T08:32:05Z")
the problem is the module give me a broken wire True as you see in the photo. ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/1/164d1b3ed85c1fe1f2b65cecec39e88a140e428b.png) this is the circuit, and i activated the channel and the IEPE supply but without ny result. ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/a/a712cd6688ff189ed462ff32ea40b84e2f19bc93.jpeg) e LED always blink ---
**Author:** ![Yacine](https://avatars.discourse-cdn.com/v4/letter/y/FF8800/32.png) [@Yacine](https://community.br-automation.com/u/Yacine)\ **Post date:** [June 6, 2025, 9:15am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/8 "2025-06-06T09:15:34Z")
i mesured the voltatge between IEPE +/- and i found it equal 3.18 V and this is less than 8 v rocommanded by B&R and for the sensor it works between 8 and 12V. i don’t know why the module give me this voltatge and how i could resolve this problem. ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/f/f61b9176b90af51e35bd7d5dbd776e76d2967b07.jpeg) ---
**Author:** ![christoph.hilchenbac](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/christoph.hilchenbac/32/423_2.png) [@christoph.hilchenbac](https://community.br-automation.com/u/christoph.hilchenbac)\ **Post date:** [June 6, 2025, 9:47am UTC](https://community.br-automation.com/t/circuit-of-the-accelerometer-and-the-module-x20cm4800x/7222/9 "2025-06-06T09:47:15Z")
I would guess your sensor requires more current than the maximum of 5.5 mA ☹. You could contact the manufacturer to be sure.