NV4232E-16P-EI Alarm Block Pinout

[katienelson71753]

Here's the final product.
You forget which wire you put zener diode on just unscrew from the pluggable terminal and send voltage down it each will read differently.
The one without it will be closer to 12v the other will be low voltage.

[katienelson71753]

https://www.amazon.com/gp/product/B099F ... UTF8&psc=1
IN472A 12v zener diode

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DC Power Cable 12V 5A Plugs Male Female Connectors for CCTV Security Camera Pigtail Power Adapter Connectors (5.5mm x 2.1mm, 10 Pairs)

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Zulkit 5Pcs Project Boxes ABS Plastic Electrical Project Case Power Junction Box Black 3.15 x 1.97 x 0.83 inch (80 x 50 x 21 mm)

[Revo2Maxx]

So thought I would post small video of my second output working with mosfet and relay, seeing don't have studio just used my cluttered and messy desk, don't judge lol. Wanted to show webui along with desk of the circuit while I control both outputs one going to small draw amber led block and two going through mosfet and 12v relay with external 12v power supply, running a load of 1.84amps
https://youtu.be/WfpGyNtpUXc?si=xtBvHspfPlgSNjWr

[katienelson71753]

!!!!! Warning !!!!!

I tested to confirm my relay is not burnt out. (-) probe on CTRL (+) probe on P = Beeeeep
[ Manual ] = no beep

What I noticed is the wall supply 12v 1 amp remains green. It was flickering red.
I tested with DMSS last night and when I clicked manual the puck light barely lit up so
I had to investigate.

GREEN=Charged OK ?Over charge protection? ?Not sending 12v from supply?
RED=Charging

Not sure yet what happened.
? Did the zener diode break down ?
? Did something like short circuit protection chip in the wall supply break down ?

Outside of that as normal I plugged a DC barrel connector (LOAD) into my multi tester and read zero volts. When I clicked [ Manual } I got at least 11v.

I only had a puck light connected to Alarm 2 so there's no way it pulled mass amps (0.044A). It did act like it was struggling and barely lit is what sparked me to investigate.

Leaning towards that it shorted out the wall supply so it's remaining green.

[katienelson71753]

I watched your video. Are you going straight out from CTRL and P into the external relay?

[katienelson71753]

Running a 12v CCTV battery backup down and then I'll use the same wall charger in attempt to re-charge the battery and see if it flickers red for charging. I plugged directly into it and it did read like 12.35v.

[Revo2Maxx]

No I am using a Mosfet and a resistor, The mosfet will turn on with the 12v that changes when the port is active alarm and will end when CTRL becomes 12v. This is able to work because the Mosfet don't take much current to turn on and produces enough current to drive a relay and even more. There are many different ones. In fact if I was willing I could OMIT the relay and drive direct from the mosfet but want to use the Contact of a relay as a way to protect the Amcrest NVR.. I posted detailed info on my Forum and can be found here.. https://www.revo2maxx.info/viewtopic.php?t=404

[katienelson71753]

Will be re-visiting that link. I'm not sure I'm going to do anything else until I have some protection coming out from the relay. Now on Alarm 1 I go straight into my Droc which will not allow anything out over 1 Amp. It shouldn't have affected Alarm 2 being the puck light's amperage is 0.044 A but I'd rather not chance damaging the relay.

!!! UPDATE !!!
Plugged in the wall unit into my CCTV 12v battery backup....when I flip the backup off the light goes solid red for charging.
When I turn it on the light goes green for Charged OK.

?Was the wall unit not working right before the zener diode? That's what I'm looking hardest at.

[Revo2Maxx]

Personally I wouldn't use a Zener diode, I mean I am not sure how you are trying to use it as Zener diodes are unique, Zener diodes are commonly used in voltage regulation, over-voltage protection, and reference voltage applications. They have a Forward and Reverse Bias and if not installed in a circuit correctly could damage what you might be trying to protect..

[Revo2Maxx]

Using a Zener diode with the NVR's output and a 12V power supply in place of a MOSFET can be problematic, and the MOSFET setup is a much more reliable and efficient solution for several reasons.

Why a Zener Diode Setup Can Be Problematic:

Power Dissipation:
Zener diodes are typically used for voltage regulation or clamping purposes, but they are not ideal for switching large loads like relays or for handling higher currents. Zener diodes are meant to maintain a specific voltage across them, but they will dissipate power and generate heat when conducting, which can become inefficient, especially with inductive loads like relays.

Current Handling:
Zener diodes are not designed to carry significant amounts of current. Relays, especially ones that require higher currents (e.g., 200mA or more), could potentially damage a Zener diode that isn't rated for such currents. Even if the Zener is rated for higher current, the setup would likely be inefficient compared to a MOSFET.

Voltage Regulation Only:
A Zener diode alone would not switch the relay on and off effectively. It would regulate voltage at a certain threshold (e.g., 12V), but that doesn’t provide proper control like a MOSFET, which can act as a switch to fully allow or block current flow. You’d have less control over when the relay is activated or deactivated.

Complexity of Proper Biasing:
Using a Zener diode would require a more complex circuit design to ensure proper biasing and control. You would likely still need to add a transistor or MOSFET for switching, which makes the Zener diode unnecessary and redundant.

Why the MOSFET Setup Is Better:

Efficient Switching:
A MOSFET like the SSF7509 (The one I used) is designed specifically for switching applications. It can handle high currents efficiently without the need to dissipate excessive power, as it has very low on-resistance (Rds(on)), meaning almost no power is wasted when it’s turned on.

High Current Capability:
MOSFETs can handle much higher currents compared to Zener diodes. For example, the SSF7509 can handle up to 75A, which is more than enough for typical relay-driving applications, even if your relay draws a few hundred milliamps.

Gate Control:
MOSFETs are voltage-controlled devices, which means they require minimal current at the gate to turn on or off, unlike Zener diodes, which would still need current through them to regulate voltage. The NVR output (seeing it provides only a small amount of current) can easily control the MOSFET gate, while the MOSFET does the heavy lifting to switch the relay on or off.

Clear On/Off States:
A MOSFET can provide a clean on/off switching capability, ensuring that when the NVR output is low, the relay stays off, and when the NVR output goes high (or provides a gate signal), the MOSFET fully turns on to power the relay. Zener diodes, on the other hand, don't provide a clear switching action like a MOSFET.

Flyback Protection:
When using a MOSFET, you can easily integrate a flyback diode across the relay coil to protect the MOSFET from inductive voltage spikes generated by the relay. Zener diodes wouldn’t offer this level of protection directly.

Using a MOSFET is far more appropriate for driving a relay from your NVR’s output, as it offers clean, efficient switching, handles higher currents, and provides better control. A Zener diode is not intended for this kind of application and could lead to inefficiency, excessive heat, or even component failure if the current exceeds its rating. The MOSFET setup is designed specifically for this kind of task, ensuring both safety and reliability in your circuit.