Good evening! I need more information on Solid State Relays as I am dealing with a system containing 8 120VAC Vibrators. These Solid State Relays require a 4-32 VDC input. Despite the analog input reading 24VDC, none of the Vibrators are functioning. Can any voltage between 4 to 32 volts activate the Solid State Relay? Additionally, there are Diodes on the wires connected to the Vibrators. When I disconnected the wires from the Solid State Relays and connected them to a 120VAC terminal, all 8 Vibrators operated. Does the output of 4-32 VDC from the PLC control the amount of 120VAC that flows through to the Vibrators? Thank you for your assistance.
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Introducing the Carlo Gavazzi RM1B23D25 voltage monitor, designed for 4-32 VDC applications. Thank you!
Is this a new system that is currently being set up, or is it an existing system that was previously operational? You mentioned that all 8 SSRs are not allowing voltage or current to pass to energize the vibrators. In this case, it is likely that the issue lies elsewhere and not with the SSRs. The SSR model you have is "instant-on", meaning it will switch on with any voltage between 4-32VDC. While SSRs can fail, they usually fail in a closed state rather than an open one. May I ask what PLC and output card/module you are utilizing?
If your vibrators are wired to a 120VAC power source and running non-stop, the solid state relay intended to control them is no longer functioning properly. The absence of a functioning DC signal to activate the relay is causing issues. It is essential to troubleshoot the lack of DC (+) voltage on terminal A1 (+) to determine the root of the problem.
To check the operation of your relay, use a meter to measure the voltage at the VDC and VAC terminals. Place the probes on the plus/minus of the relay where the DC connects to determine the Voltage. Then, place the red probe on one terminal of the relay and the black probe on ground to check for 120VAC. If you have DC voltage applied and 120VAC on both AC terminals, your SSR is working properly. However, if you have VDC but only 120VAC on one terminal, your SSR may be faulty. And if you have VDC but no 120VAC on either terminal, there may be an issue with your 120VAC supply.
Hello! In theory, any voltage within the 4-32VDC rating of the solid state relay (SSR) should trigger it. There might be an issue with the SSR itself or perhaps the relay isn't getting a proper signal from your PLC. It's possible that there's an issue with the signal's duration or flow. Regarding your second question, the SSR typically just acts as a switch, i.e., it's either on or off, so the 4-32 VDC from the PLC won't control the amount of 120VAC that goes to the vibrators. The diodes could be for reverse voltage protection. If they're miswired or failed, that could be your issue. You might want to check whether your SSR needs a 'zero-crossing' signal to turn on. In the end, create a simple test environment directly feeding 24VDC to relay, it will surely help to isolate the problem. Good luck troubleshooting!
Yes, generally speaking, any voltage between 4 and 32 VDC should activate the Solid State Relay (SSR). As to your question whether the 4-32 VDC output from the PLC affects the 120VAC flow to the vibrators, not likely. SSRs typically operate like a switch—either ON or OFF. So if your SSR is activated, the output voltage should be close to your input voltage (120VAC). The state of the SSR (ON or OFF) doesn't influence the magnitude of the output voltage. It seems like the issue might be somewhere in your control setup, perhaps with the PLC outputs or even the SSRs themselves. The diodes on your vibrator motors seem to work fine, as they operated when directly connected to a 120VAC source.
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Answer: - The Solid State Relays typically require a 4-32 VDC input to activate for controlling 120VAC devices.
Answer: - While the analog input reads 24VDC, it may not be within the required 4-32 VDC range needed to activate the Solid State Relays for the Vibrators.
Answer: - Yes, as long as the input voltage falls within the specified range of 4-32 VDC, it should be able to activate the Solid State Relays.
Answer: - The output voltage from the PLC controls the activation of the Solid State Relays, which in turn regulate the flow of 120VAC to the Vibrators based on the input voltage provided.
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