ALTER SM 1180 Series, Технические заметки

Страница: 6 / 36

page 4 of 35
File: SM1180_r9eng - December 2007 - Technical note: SM1180 & TM 060
SM 1180 & TM060
File: SM1180_r9eng - December 2007 - Technical note: SM 1180 & TM 060
page 5 of 35
SM1180 & TM060
Handling Warnings
The SM1180 has two handles on the front panel to help
unpacking and handling operations: never use only the
handles to lift the equipment but support the weight with
an appropriate base on bottom!
The handles do not withstand the off-center weight of the
equipment
(SM1180T: 36.5 kg = 80 lbs, SM1180D/U: 40 kg = 87 lbs).
General Description
The SM1180 is able to supply the power required by a magne-
tron with power up to 6 kW (which correspond to 1100 mA
of anodic current), meeting the specifications set by the tube
manufacturer.
This manual describes the features of the following:
- version 4: standard version for YJ1600 magnetron
- version 5: standard version for H3881 magnetron
- version 54: special version with separate aux voltage and
magnetron YJ1600
- version 55: special version with separate aux voltage and
magnetron H3881
The description apply to any versions unless specified diffe-
rently.
The power output can be regulated continuously using an
external analogue signal or the panel potentiometer where
provided.
The power supply is built in a self-ventilated 19” wide rack,
7HE high, with a front panel comprising:
-a 4 digit display (upper) showing a working parameter, i.e. the
output power, or the alarms codes
-a 4 digit display (lower) showing the reverse power (if the
necessary external accessories are provided)
-several signalling LED for working conditions
- inlet air filter
The power supply is designed to guarantee stable, correct and
safe operation, and offers the following special features:
a) all the versions has the option to be driven with a reference
signal 0-10 V (or 0-5 V or 0-20 mA), while into versions 2
and 3 may be used also the front potentiometer.
b) it is equipped with a circuit capable of detecting the over-
voltage on the magnetron (“moding”, detecting operation
at frequencies other than the normal operating frequency or
damage or end of the magnetron life).
The circuit accepts a short period of overvoltage (about 2
seconds) in the switch-on phase, this is normal, especially if
the magnetron reaches the end of its life or the filament power
supply voltage is low.
The circuit also ensures that the power supply is switched
off if the high voltage cable is disconnected, or if the heating
filament fails.
c) it has a circuit capable of detecting an earth current on the
anode circuit, super imposing the normal current circulating in
the magnetron (which returns to earth).
The circuit can pick up current from a resistance of 5 Kohm,
in parallel to the magnetron, irrespective of the current circu-
lating.
The circuit also intervenes in case the high voltage short cir-
cuits to earth, or there is a reduction in the working voltage of
the magnetron.