ALTER SM1150, Техническая заметка

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page 14 of 29
File: SM1150_r5eng - February 2007 - Technical note: SM1150
SM 1150
File: SM1150_r5eng - February 2007 - Technical note: SM 1150
page 15 of 29
SM 1150
[28]
TMR
: entering this menu you access to internal timers
[29] :
ON
timer: it’s enabled only when the filament is hot
(Ready mode): the value can be resetted by user but the system
holds information of the reset.
The CPU makes a round value to tens of hours, but the time
count has the accuracy of the minute. Max value displayed is
99.99 (=99,990 hours)
[30] :
RDY
timer: it’s enabled by presence of main line and
cannot be resetted by user.
The CPU makes a round value to tens of hours, but the time
count has the accuracy of the minute. Max value displayed is
99.99 (=99,990 hours).
[32]
MODE
: entering this menu you access the Control
Mode, enabling the type of control
MANU
(Manual): the unit is controlled by the
panel commands, i.e. if you want to adjust the
power by panel knob
EXT
(External) the unit is controlled by exter-
nal command, i.e. if you are supplying com-
mands from a PLC
REMO
(Remote) the unit is driven by serial port or
CanBus
[36]
VERS
: entering this menu you get the release number
[37], i.e. V201 (for version 2.01)
[54]
CAL
: entering the Calibration menu you access to custo-
mize /verify the Table [55] or modify the Efficiency value [62]
or select the Default Table [61]
[55]
TABL
: entering this menu you may modify the Table.
The Table consists of 20 values of linearized output power the
unit will reach to match the reference signal.
The unit has a default Table that is stored during final
tests at Alter: from vers. 2.01 the unit uses, as standard at
Power-ON, this default Table.
Customizing of the Table:
you need a power meter measuring
the forward r.f. power on your system.
The measure is needed to linearize the whole system as, in
principle, twice the dc power supplied to magnetron does not
mean twice the microwave power delivered to the load.
Once entered into
TABL
menu, the software shows you fixed
numbers, starting from 300 - with increment of 150 - up to
3000: these are the 20 steps you may customize. These num-
bers represent the desired microwave power (i.e. 300 = 300
Wrf).
At every step is associated and memorized a corresponding
d.c. power that the SM1150 will ignite to the magnetron to
produce the desired microwave energy.
You may skip forward and backward, leaving them as they are
or modifying all or just few.
To modify confirm with ENTER button but be careful: this
procedure requires the SM1150 to produce power and the
microwave generator will produce, consequently, microwave
energy.
Warning
: if the power supply is in MW - ON state but does
not produce microwave energy because the reference signal is
zero, once you push the ENTER button, from TABL menu,
then the SM1150 will produce output power and you may
adjust at any level of power, once you are entered into a step,
simply rotating the encoder knob on the panel
I.e.: suppose the first step 300, which is 1/10 of the full range
and also corresponding to 1V of reference signal, has stored a
default value of 500 Wdc, and the third step 600, correspon-
ding to 2 V of signal, has stored a default value of 1000 Wdc:
if you’d like to verify and, in case, to modify them, you have:
a) to enter into
TABL
menu (press ENTER from
CAL
menu)
b) to enter into the 300 step (press ENTER again)
c) to see the stored dc power value press ENTER
and the unit will produce energy: the display shows
you 500 (Wdc, the stored value)
d) read from your power meter the microwave
energy: suppose it’s close 300 W, then you decide to
leave the step as it is: press ESC
e) you are back, the display shows you the number
300 (point b)
f) reach the third step (600) with the TAB and
then press ENTER
g) repeat point c): the display shows you 1000
h) read the power meter:
it shows close to
550
Wrf and then you decide to correct it