Battery problem

[Canha]

Hi,

I have a cytech system, and it\'s always displaying low level battery.

My system has:

1 Comfort Ultra II
1 Keypad wiht LCD
2 SEM02-M2 with an LEM02-M2 on each other
3 UCM\'s (Eth, KNX, GSM02)

23 Movement detectors
4 Fire detectors
4 Water detector
1 Carbon monoxide detector
2 Gas detector
3 Maagnetic detector


The movement, fire, water, carbon and gas detectors are feeded by the cytech power, and one of the SEM is about 7 meters, and other about 3 meters far from the Cytech Comfort Ultra.

I have a 7Ah 12V power battery, and when I connect it to the system, it displays a low power battery on the second SEM. I mesured it and connected to the system, and it has 12,45V.

Is this possible that this battery is not enough for this system? Or do I need to buy an other SEM01-M2 to connect another battery to the system?

Thanks for the help.

Avelino Canha

[ident]

The main Comfort panel and each SEM01-M2 can supply about 1 A. You have 2 SEM02s (without power supply) and a lot of detectors which require power so it could be too much for the power supply

Measure the voltage at the SEM2 12V terminal itself, not at the battery because ther may be voltage drops along the wire which causes low voltage at the SEM02

You can buy the PSM01 which is the power supply of the SEM01 to add the Power supply

[Canha]

Hi ident

I have 11.22V at the first SEM02 terminal, and 11.02V at the second SEM02. I know that it should be higer than 11.50V, that means that I need two PSM01, or maybe one is enough?

Avelino Canha

[ident]

The problem is the SEM02s are supplying too much current and the wiring Resistance is too high so the voltage drops due to the wire resistance

Are you using separate wires to join the SEM02s to the Comfort? You should not series the 12V wires

You can also double up the wires to lower the resistance

However if yiu cannot get the voltage to 12V + then you should get PSM01 for both Slaves