FX 950 T
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File: FX950T_r0eng - April 2004 - Technical note: FX 950 T
File: FX950T_r0eng - April 2004 - Technical note: FX 950 T
page 5
of 8
FX 950 T
Fuse replacement
Replace the fuses as follows:
-turn the voltage of the power supply unit off;
-remove the cap of the fuse holder;
-replace the fuse with a new one with the same electric
characteristics;
-check the fuse holder and in case of oxidation or burns,
replace it;
-reassemble the cap of the fuse holder;
-turn the voltage of the power supply unit on;
Refer to “Fuse specifications” for the value of the fuses.
Connection instructions
I) The power supply unit must necessarily be earthed by
means of the input earth clamp (central clamp looking
from the clamp side) with a 2.5mm ² cable;
II) The microwave head must be connected to the power
supply unit by means of the earth wire (yellow-green)
provided on either the head and the power supply; for
safety reasons, another earth wire must be placed on the
earth terminal on the head.
III) The connections between the head and the power
supply unit are carried out by means of plugs and
terminals: do not turn the power supply on if all the
cables are not correctly connected and fixed in their
positions.
IV) Apart from the connection cables to the head, the
connections to RACK POWER UP, ENABLING signals
and to the INTERLOCK chain are required (closed
contact to supply power). If INTERLOCK is not to be
used, terminals 6 and 7 can be connected together on
connector J5.
V) Install an external switch in order to disconnect the
main power supply, to be used each time maintenance
operations must be carried out on the power supply unit.
VI) The characteristics of the external switch must
comply with the EN 61010-1 standard, it must be
installed near the power supply unit and easily reachable
by the user.
VII) In order to carry out the connection to the terminal
board of J2 mains input, make sure that the mains is not
connected through a the external switch.
Failure to comply with these instructions is dangerous
for those who use the equipment, apart from the
possibility to cause equipment breakdowns.
Power-up procedure
Complete the connection correctly before setting at work.
Caution:
if the power supply unit is powered without
the provided high-voltage connection between the
power supply unit and the magnetron, on the outgoing
Faston connector there is a dangerous voltage;
DO NOT restore the high-voltage connection before
discharging the capacitor to earth by means of a
suitable insulated tool.
Caution:
connect with a direct cable the earth screw
of the head with the earth screw of the power supply
unit. Failure to make this connection may cause
danger of death!
Activate the external switch to power the equipment;
FX950T is completely powered by activating the RACK
POWER UP input with a 24Vdc voltage. The presence of
the mains is indicated by the green pilot light “POWON”
on the M330 card. Wait at least 20 seconds for the pre-
heating of the magnetron filament before providing the
enabling signal.
Activate the output power to the microwave head by
activating the ENABLING input.
The output of the unit is interrupted when:
1) the ENABLING signal stops
2) the INTERLOCK chain (temporary or permanent
opening of the NC interlock circuit) is opened
3) the safety thermostat (T=130 °C) placed in the high-
voltage transformer TR2 is opened.
4) the safety thermostat (T=100 °C) placed on the
Magnetron is opened.
5) one of the fuses blows.
6) the RACK POWER UP signal stops