Matheson NM Series - Cascading

Hydrogen Generator NM Series 2 User’s Manual
21
Generator 1
Configuration:
Cascading mode : Normal
N. Gen H2 in Cascading : 2
ID Number : 1
Generator 2
Configuration:
Cascading mode : Normal
N. Gen H2 in Cascading : 2
ID Number : 2
RS-485 port
RS-485 port
H2 Out
H2 Out
Gas Line
Parts included:
1. cable RS 232
2. Software for Windows (compatible with Windows 2000/XP) P/N MCBD-0194-XX
Cascading
The RS-485 interface allows up to 10 generators to be operated in parallel mode. There are
Two modes available.
Normal mode: in this mode the gas outlet of each generator will be connected directly into a
gas line and the pressure is controlled by the generators. This works fine with two genera-
tors.
External Pressure control: In this mode the generators are connected with an external non
return valve to the gas line. The pressure must be controlled with an external pressure regu-
lator. The outlet pressure is fixed to 10.3 bars. This mode allows up to 10 generators in a
cascading group.
How does cascading work
The communication of the generators is done via the RS-485 Interface. For a correct com-
munication each generator needs a unique ID number. Each generator must know how
many generators are connected in the cascading group. As soon as the generators are
powered up, one generator becomes the master, and controls the others (slaves). If there is
a problem with the master, one of the slave generators will become the master.
Every generator can be forced to be the master, by entering into the menu you will see the
function “force to master”. Than just select this function and acknowledge.
When a generator is the master, you can see the letter “M” in the menu button, while the
slaves show the letter “S”.
Set up for Normal mode
Fig.21
Software compatibility!
Before generators can be cascaded, it must be clarified that their software ver-
sions are compatible and can work together.