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How to control a servo valve

Created by: B.Blach at: 2/22/2025 10:23 AM (16 Replies)

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2/22/2025 10:23 AM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	How to control a servo valve with a AI range 0 to 2.5VDC in CW direction and from 2.6 to 5VDC for CCW direction with a AQ in mA to drive the valve? Servo valve info: (Single coil) Any help please, I´m stuck....
	Last edited by: B.Blach at: 02/22/2025 10:24:22 Last edited by: B.Blach at: 02/22/2025 10:24:59 Last edited by: B.Blach at: 04/09/2025 22:15:58
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2/22/2025 11:10 AM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	The screenshot shows that the valve needs both a positive and a negative current signal. The LOGO! AQ module cannot do this, but it could be switched using a relay. Depending on the wiring, a current of at least 50 mA is also required. The AQ module cannot do this; 20 mA is the highest.

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This contribution was helpful to 1 thankful Users B.Blach

2/22/2025 11:49 AM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	Thanks for quick reply, so another topic is what is doing this I24V DC = 35 ... 90 mA connection in the module?

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2/22/2025 2:33 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	No. 20 mA ist the maximum.

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2/22/2025 3:07 PM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	Thanks for your support, my idea is try to emulated this obsolete drive PCB with LOGO. Any input will help Thanks again @IXO65
	Last edited by: B.Blach at: 02/22/2025 15:07:47
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2/22/2025 3:07 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	This is the current consumption of the 24 DC supply voltage.

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2/22/2025 3:18 PM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	OK Thanks clear now, really appreciate.

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This contribution was helpful to 1 thankful Users ixo65

2/23/2025 12:48 PM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	Hi IXO65, I dont have a AM2 AQ module to test, you think this program nay works with a max output of 20mA as you mention ?
	Last edited by: B.Blach at: 04/09/2025 22:15:02
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2/23/2025 1:20 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	No. At first: Your gain in the analog amplifier is wrong. At second: The AQ can't work with negative values in input.

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2/23/2025 2:24 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	I think you need something like this: Knick Conditioner In the LOGO! you must convert the the voltage input 0,00 VDC - 5,00 VDC to 0 - 1000 units for the AQ. 0,00 VDC = 0 Units --> 0 mA output of the AQ 2,50 VDC = 500 Units ---> 10 mA output of the AQ 5,00 VDC = 1000 Units ---> 20 mA output of the AQ The conditioner makes then: 0 mA input = -20 mA output 10 mA input = 0 mA output 20 mA input = 20 mA output

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2/23/2025 2:48 PM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	what about this ?

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2/23/2025 2:58 PM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	SIGNAL CONDITIONER looks the best option, thanks a lot IXO65
	Last edited by: B.Blach at: 02/23/2025 14:59:25 Last edited by: B.Blach at: 02/23/2025 15:00:20
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2/23/2025 3:04 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	B.Blach what about this ? No, this can also not work. The AM2 AQ module needs 24 VDC as power supply and not ±12 VAC.

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This contribution was helpful to 2 thankful Users B.Blach Moderator_Lan

2/27/2025 10:02 AM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	Hello IXO65 I just finish my project, my question for you is how EOT (end of travels) can force the servo-valve only move to the oposite direction when EOT are present?
	Last edited by: B.Blach at: 04/09/2025 22:13:23 Last edited by: B.Blach at: 04/09/2025 22:14:00
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2/27/2025 10:18 AM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/14/2025 Posts: 35958 Rating: (4501)	I don't know.

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This contribution was helpful to 1 thankful Users B.Blach

2/27/2025 10:32 AM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	If you dont know, we have a problem, OK thanks any way. Will see if I can make it., I will let you know ;)

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3/2/2025 6:53 PM	Rate (0)
B.Blach Joined: 1/25/2024 Last visit: 7/5/2025 Posts: 41 Rating: (0)	Good news problem solved!!!! If anyone needs more info just let me know Attachment UHD037_Levelwind.pdf (231 Downloads)
	Last edited by: B.Blach at: 04/09/2025 22:09:25 Last edited by: B.Blach at: 04/09/2025 22:17:17
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This contribution was helpful to 1 thankful Users Moderator_Lan

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