[Nut-upsuser] Identify SIEMENS MASTEGUARD

[Robert de Vrey]

Hi,

 

Sorry to bother all of you this way, I see no other way at this point.

I am trying to get a Siemens Masteguard working and found, by trial and
error.

Has anyone seen this before?

 

I have the following info:

 

9600 BAUD 8 bits no parity 1 stop

 

The commands look a lot like the SENA  protocol except for the messaging
format.

 

It reacts as follows

Sending ascii command:                       "UID{CR}"

Response:
"ID=Masterguard;A700-T;11.00;6AR1700191{CR}"

 

Sending ascii command:                       "BAT{CR}"

Response:
"BAT=2;0450.0;100;27.4;24;313.0,313.1{CR}"

 

Sending ascii command:                       "OUT{CR}

Response:
"OUT=2;49.9;217.0;00.0;0000;000{CR}"

 

Sending ascii command:                       "ALM{CCR}"

Response:
"ALM=01;0;0;0;0;0;0;0;0;0;1;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0{CR}"

 

Sending ascii command:                       "TST{CR}"

Response:                                           "TST=0;0;0;0;0;0;0{CR}"

 

On the internet it seems that more people are looking for information. This
version is from before the time that Siemens sold the design to Choride.

The funny thing is that the CPU control board for old and new versions is
the same. Only the firmware is different.

 

The hardware design is similar for all devices. 

Switch mode step down power supply to charge the batteries

Switch mode symmetrical step up to + and - 375 volt using FET bridge

Half bridge using IGBT to chop the +- 375V to a true sinus

 

Optional additional power supply to battery voltage (half the power rating
of the unit). So that the output is frequency unrelated to the input.

The difference between smaller and bigger units is in the coils,
transformers and number and or size of FET's and IGBT's

The units use 24V (2*12) 37V (3*12) or 96V (8*12) battery depending on power
and available up time

 

WARNING THERE IS NO GALVANIC ISOLATION!!!!! 

 

The advantage is a smaller, lighter and more power effective unit.

 

 

Regards,

 

Robert

 

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