ALTER PM 740 T Instruction Manual

PM 740 T
SWITCHING POWER GENERATOR
WITH PULSED OUTPUT CAPABILITY
FOR 2 kW MAGNETRON C.W.
(8 kW PEAK POWER)
TECHNICAL NOTE
(Issue September 2004)

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CE Declaration of Conformity
Dichiarazione di Conformità CE
Manufacturer’s Name: ALTER s.r.l
Nome del Costruttore:
Manufacturer’s Address: Via Curie, 8 - 42100 Reggio Emilia - Italy
Indirizzo del Costruttore:
Declare that the microwave generator:
Dichiara che il Prodotto:
product name: PM740 (power supply) and TMx20 (microwave generator head)
nome del prodotto PM740 (alimentatore elettrico) e TMx20 (generatore a distanza)
model: PM740T.xxx - PM740T.xxxC - TM020.xxx0,
modello TM020.xxx1 - TMA20.xxx0 - TMA20.xxx1
Complies with the following norms:
Soddisfa le seguenti norme:
EN 61010-1: 1994 + A2: 1996 (EN 61010: 1993 + A2: 1995)
EN55011: 1991
The products listed above comply with the requirements of the Low Voltage Directive 73/23/EEC.
I Prodotti sopraindicati sono conformi con la Direttiva di Bassa Tensione 73/23/EEC
Reggio Emilia, September 2002.
Marco Garuti
Presidente C.d.A.
Rev. Note di revisione Data File
0 Prima emissione Settembre 2002 PM740T_r0
1 Correzione testo e dati Giugno 2003 PM740T_r1
2 Correzione cablaggio conn. 2 e 5 Settembre 2003 PM740T_r2
3 Aggiornamento dati fusibili e peso Settembre 2004 PM740T_r3

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Contents
A
Alarm codes table 19, 20
C
CE Declaration 1
Cleaning 5
Components List 14
D
Display 9
E
Environmental conditions 5
Equipment installation 6
Equipment operation 7
Equipment Ratings 4
F
Fuses replacement 6
Fuses specications 5
G
General Description 3
General Information 2
H
Handling instructions 6
Handling Warnings 3
How to order 21
M
Meaning of external command 8
Menu diagram 10
P
Parameters setup 9
Physical characteristics 5
Pin out of CONN. #1 15
Pin out of CONN. # 2, 3, 4 15
Pin out of CONN. #5 17
Pin out of Serials 18
Power up procedure 7
S
Software Upgrading 12
T
Technical Assistance 21
U
User Interface 9
W
Warnings 2
Wiring instructions 6
Working modes 8
General Information
This equipment satises the European Standard EN 61010-
1 (=CEI 66-5) (=IEC 1010-1) approved by CENELEC on
9/3/1993.
With reference to EN 61010-1 standard, note:
this appliance must be installed and serviced only by qualied
personnel.
The appliance must only be used by persons acquainted with
the regulations covering the application.
Note about EMC regulation: the generic emission standard
EN50081-2 (title: Electromagnetic compatibility - Generic
emission standard - Part 2: Industrial environment) states that
“Where a relevant dedicated product or product-family EMC
emission standard exists, it shall take precedence over all
aspects of this generic standard”.
The equipment described in this manual has been classied as
industrial, scientic and medical (ISM) radio-frequency equi-
pment and the related standard for the emission is EN55011
(=CEI110-6) (title: Limits and methods of measurement of
radio disturbance characteristics of ISM equipment.)
With reference to the EN55011 standard, this equipment is
included into Group 2 (Microwave generators, Thyristor
command equipment, Welding equipment, Induction heating
equipment or machine, Microwave industrial oven, etc.), Class
A (industrial environment): for this reason this equipment shall
not be used in the residential, commercial and light-industrial
environment.
The PM740 and TMx20, when properly installed, complies
with the limits of radio disturbance characteristic of a Group2,
Class A equipment as stated by EN55011.
A copy of the tests performed may be sent on request. Note
that these tests cannot be used as a conformity certicate of the
user’s nal equipment.
WARNINGS
The PM740 is powered by AC main line and has high vol-
tage output (close 4 kV): read carefully this manual before
using. Be sure of that the equipment is correctly connected
as described below.
Failure to comply with the instructions enclosed in this ma-
nual may involve considerable risks for the staff responsible
for checking and using the equipment, as well as the risk of
general malfunctions of the equipment itself.

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Handling Warnings
The PM740 has two handles on the front panel to help
unpacking and handling operations: never use the handles
to lift the equipment but support the weight with an appro-
priate base underneath the equipment!
The handles will not withstand the off-center weight of the
equipment (20 kg = 44 lbs).
General Description
The PM740T may operate as a continuous or pulsed power
generator for a 2 kW - CW magnetron such as the 2M130 or
equivalent.
As a continuous source the user may adjust the magnetron’s
power over the entire range from 160Wrf up to 1600W rf,
while in pulsed mode the PM740 can drive the magnetron to
deliver a peak power up to 8kWrf, with a duty factor of 20%
max, corresponding to an average power of 1600Wrf.
The PM740 may be controlled:
a) manually via the front panel keys
b) remotely via a PLC with 0-10V analog signals
c) by RS232 serial port or Canbus.
The power supply is built in a self-ventilated 19” wide rack,
3HE high, with a front panel comprising (see drawing):
- a main switch [1];
- a backlit LCD display showing a selected working parameter, [2]
i.e. one of the following
the output power,
the forward microwave power
the reected microwave power
as well as any of the alarms codes.
It can be used to display set parameters such as
language
duty cycle
pulse frequency
alarm levels etc;
- 3 push-buttons for parameters settings [3]
«scroll down»
«escape»
«enter»;
- a rotating knob to adjust the chosen value [4];
- pull off handles [5].
The PM740 has been developed to power and monitor Alter’s
remote microwave head type TMx20.
The PM740 unit may be used also to power other microwave
generators (heads) developed by other manufacturers provided
that they are electrically compatible. See the electrical speci-
cations of the unit on the next pages.
The reduced height of the rack (only 3 HE, corresponding
to 133 mm) allows a small cabinet to be used, even in a large
installation: i.e. in a 2 meter high 19” rack cabinet with an, up
to 9 PM740 units may be easily installed.
The user must provide a proper cooling ow: the cooling air
enters into the PM740 through the front panel, passes through
the internal circuits and components, then it exits through the
rear panel. The intake air ow is approx. 150 m³/h.
You must avoid mixing output air with inlet air.

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CONN #5
RS 232
CURRENT
DATES/N
POWER
INPUT FREQ.
REGGIO E. - ITALY
MODEL P/N
ar
e
t
l
KVA
V
A
Hz
CONN #2
CONN #3
ATTENZIONE! ALTA TENSIONE
WARNING! HIGH VOLTAGE
CONN #4
CONN #1
ATTENZIONE: COLLEGARE AL MORSETTO DI TERRA DELLA TESTA
IL MANCATO COLLEGAMENTO PUO’ CAUSARE PERICOLO DI MORTE!
WARNING: CONNECT TO THE GROUND POINT OF THE HEAD
ABSENCE OF PROPER GROUNDING MAY CAUSE DEATH!
F1 F2
32
REAR PANEL
74
1
8
5
9
8
6
The rear panel comprises the following:
- a 7 pins socket for the main supply (CONN. #1) [1]
- a 14 pins socket for the signals from the remote microwave
head (CONN. #2) [2]
- a 1pin socket for the high voltage output (CONN. #3)[3]
- a 7 pins socket to power the remote microwave head
(CONN. #4) [4]
- a 25 pins «D» type socket for the external control signals
(CONN. #5) [5]
- a 9 pins «D» type socket for the RS 232 port [6]
- the fuses holders (F1, F2) [7]
- the lter mesh of the outlet cooling air, whitch also reduces
EMI noise [8]
- the equipment label [9]
Equipment Rating
Main supply (nominal): 3 x 400 V 50/60 Hz
Minimum main voltage: 360 V
Maximum main voltage: 440 V
Transient overvoltage: overvoltage cat. II
according IEC 664
Intake current @ 400 V: 7 A (max)
Power factor (CW): 0.74
Efciency (CW): 90%
Max Output power 2800 W
Max anodic mean current: 700 mA (CW mode)
Max anodic peak current: 3.1 A (Pulse mode)
(at the max ambient tempe-
rature of 40°C)
Pulse pattern: period: 100 μs ÷ 2500 μs
time ON: 20 μs ÷ 500 μs
duty: 1% ÷ 20%
Output ripple: 40mA max
Suitable magnetrons: 2M130/NL10250-1/2/3
Filament trafo type: FIL100F
Filament control: with preset hardware curve or
special curve stored in the CPU
Filament preheating: automatic at power-on
Enable microwave command: 24 Vdc (range 12÷24Vdc)
optoinsulated
Load of the status contacts: max 130V - 0.5A
Working mode of Alarm contact:
a) unit in power OFF: contact open
b) unit in power ON, no alarms: contact closed
c) unit in power ON, alarm status: contact open
Working mode of Ready output: 24Vdc - 50mA
a) unit in power OFF: contact open
b) unit in power-ON, no alarms,
lament ready (preheating completed): contact closed
c) unit in power ON, alarm status: contact open
Output stability: within 1% for input
uctuations within +/-10%
Reference signal to adjust power:
0-10 Vdc (Z=100 KΩ) (optoinsu-
lated)
Management of alarm situations:
a) by internal alarm relay, contact
load: max 130 V 0.5A
b) by showing of the alarm on
display (see the alarm table on
next pages)
c) by the emission of a 4-bit code
on the signals connector:
24V 50mA max

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Environmental conditions
Use: Indoor use only
Altitude: tested up to 2,000 m (~6,000 ft)
Temperature: 5°C to 40°C (41°F÷104°F)
Relative Humidity: 80% for temperature up
31°C(88°F), decreasing
linearly to 50% RH at
40°C (104°F)
Pollution degree: 2, complies with the norm
IEC664
Fuse specications
The PM740 has 2 fuses installed on the rear panel (refer to the
drawing on page 4, position 8): both fuses, labelled F1 and F2,
protect the output line powering the remote head.
Fuse F1 and F2 specs:
- Size, type: 10x38 mm, ceramic cartridge
- Speed action: quick (F)
- Rated current: 6 A
- Rated voltage: 500 V
For instructions about fuse replacement please refer to related
paragraph on the next page.
Physical characteristics
Front panel dimensions: 19” x 3HE
(482 x 133 mm)
Rack total width: 475 mm
Rack total height: 133 mm
Rack depth (without handles): 440 mm
Housing board depth (minimum): 800 mm
Total weight: 20 kg (44 lbs)
Intake air ow: approx 150 m³/h
Equipment maintenance
Cleaning
Cleaning of the air lter:
verify once a month. In case you need to remove dust
then proceed as follow:
- remove main line from the unit
- remove the cover
- use pressurized air from inside to outside
for short time: do not exceed or you
may damage the fan
- install the cover and then power-on again.

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Fuse replacement
To replace the fuses on the rear panel proceed as follow:
- switch-off the main breaker on front panel or wha
tever device is provided to remove main line from the
equipment;
- unscrew the fuseholder cap;
- replace the fuse with a new one with the same
electrical characteristics;
- also inspect the fuseholder: if it’s oxidised or it has
burn marks then replace it;
- install the fuseholder cap and screw tight.
- fuse values are given below in Fuse Specs page 5
Equipment installation
The PM740 cannot operate on a bench: it must be installed into
a proper cabinet such as a commercial 19” standard enclosure.
The equipment is intended for industrial use only, not for
laboratory use, and the user must respect the wiring norms
and prescriptions as described into next paragraph (“Wiring
instruction”).
The equipment must not operate cantilevered, it must be safely
xed inside a cabinet by means of screws on the front panel
(which is provided with 4 holes) and supported by means of a
proper frame on the bottom for, at least, 3/4 of the total depth.
Usually two “L” shaped supports on each side of the equip-
ment, having a dimension of mm 10(h) x 30(l) x 1.5 (thick) are
suitable for this purpose.
The rear side of the equipment must be protected by a xed
panel which can be removed only by means of tools or by a
door with security micro-switch: when the door is opened the
micro-switch must shut-off the main line. This safety pre-
cautions must be taken to avoid operation on rear fuses or on
connectors while the unit is still powered.
Special attention must be taken on designing the cooling air
ow whenever several units are stacked in the same cabinet.
Note that each unit has its own fan which supplies approx 150
m³/h: the outlet of the exhaust air is on the back of the equip-
ment.
When designing a cabinet to house several units we recom-
mend that the following design criteria be adopted:
- use a standard 19” wide enclosure with a depth of
800 mm (32”);
- allow free intake of the cooling air from the front of
the cabinet and exhaust air from back;
- in case of ambient air with high degree of dust and
moisture, install a proper air conditioner; if you cannot
do this, then you have to use suitable air lters and
instruct the user about their cleaning;
- provide a separation between the air intake duct and
the air outlets, in order to avoid air-recycling.
Handling instructions
The equipment weight is 20 kg (44 lbs). Always lift from the
bottom and use an adequate rugged support to avoid personal
injury and damage to equipment itself.
In the case of shipping, package with the original package or
use a wooden case and a proper ller: movement of the equip-
ment inside the package must be avoided.
Warning: use handles only for helping during installation.
Never use handles to lift the rack: the handles will not
withstand the off-center weight of the rack!
To lift always lean the rack over a proper supporting base.
Wiring instructions
The PM740 must be installed and serviced only by qualied
personnel acquainted with the regulations covering the applica-
tion. For safety operations the following rules must be adopted:
I) the equipment must be grounded through connector #1
using pin 4 (see the wiring diagram at page 15);
II) connect the ground screw on panel rear (indicated by
“ground” symbol) directly to the remote microwave generator
head by a separate yellow/green wire gauge 2.5 mm²;
III) the main supply, 3 x400V must be provided through con-
nector #1: connect phases according to schematic at page 15.
2,5 mm² wire must be used with this connector.
IV) The magnetron head unit must be connected to the main
unit by connector #2. 1.5 mm² wire must be used with this
connector. Refer to wiring diagram on page 16;

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V) The high voltage output from the main unit must be
connected to the magnetron head by connector #3 and must
be connected to magnetron’s anode, usually marked with the
symbol “FA” on the magnetron’s teminal.
This voltage is near 3.5 kV.
Use a proper insulated cable with working voltage >5 kVdc
and minimum gauge of 0.25 mm²; protect the wire with shea-
thing (armoured if possible).
The reliability of the system begins with the high voltage con-
nection so this cable must be assembled professionally.
ALTER can supply the HV cable with length on request.
VI) the connector #4 provides the power supply for the lament
transformer (usually located near the magnetron), the magne-
tron fan and a warning lamp. Use wires with a max gauge 1.5
mm². Refer to the wiring diagram on page 16;
VII) The “D” type female connector #5 has 25 pins and brings
the I/O signals to the equipment. We suggest shielded ribbon
cable is used for this purpose.
Refer to wiring diagram on page 17.
VIII) The “D” type female connector RS232 has 9 pins and
is a standard serial port. It can be used to upgrade the PM740
software using a PC. The pin-out connections are given on
page 18.
IX) the user must provide an external cut-off device, to protect
the PM740 from short-circuit and thermal runaway conditions;
this external protection device must also allow the main line to
be isolated for maintenance operations;
X) the external circuit breaker must be a 3-pole breaker and
must comply with EN61010-1 specications;
XI) the external circuit breaker must be in close proximity to
the equipment and within easy reach of the operator;
XII) the external circuit breaker must be marked as the discon-
necting device for the PM740;
XIII) the connector #1 must never be used as a switch-off
device.
Failure to comply with these instructions may involve
considerable risks for the staff responsible for checking and
using the equipment, as well as the risk of general malfunc-
tions of the equipment itself.
Equipment operation
Power-up procedure
Before powering-up the equipment you must be sure to have
properly connected (look at the chapter “Wiring Instruction”
in case of any doubt), then set the front panel breaker in “ON”
position, marked with “1”.
Once set to OFF (position “zero”) wait at least ve seconds
before setting it ON again.
This rule must be applied even in case the power is switched by
an external contactor (and the panel breaker has always left in
ON state): the OFF state, between two consecutive ON state,
must last 5 seconds.
At power on the unit enters into “POWER-ON” state for few
seconds to performs some internal checks and then goes imme-
diately into “STAND-BY” and remains in this state until the
“hibernate” command is switched OFF.
It’s also possible to permanently disable the “hibernate” com-
mand: in this case the PM740 performs the lament heating
immediately after the “POWER-ON” state, provided there are
no alarm conditions present.
At the end of the heating cycle the unit enters the “READY”
mode: the power supply may now power the magnetron to
generate microwave when it receives the enable command.
Any type of alarms will force the unit to exit the “READY”
state and to enter the “ALARM” state.
In absence of any alarm the power supply may be left in the
“Ready” state continuously: when it receives the enable com-
mand (ON) it enters into “RF-ON” state and generates output
power, when the enable command is removed (OFF) the unit
comes back to the “READY” state.

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Working modes
The working capability of the PM740 depends upon its
“working mode”: it has several modes each with a different
meaning and functionality.
These modes are:
POWER-ON: it goes in this mode at power-on, when the main
breaker is set to 1: the CPU performs some internal controls,
display the factory’s logotype and after few seconds, the unit
enters the Stand-By mode.
STAND-BY: This is a waiting state, the unit is powered but not
yet ready to generate microwave as the magnetron lament is
not powered. In this mode all of the working parameters can
be set from Operator Panel; the unit enters in Stand-By from
the previous Power-On state or from a Reset state. The unit
exits from Stand-by and goes to Preheating only if there are no
alarms present, and the “hibernate” command is OFF.
PREHEATING: This is a temporary state, controlled by an internal
timer, whitch allows the lament to be heated. Entrance in this
mode is done by an external command or automatically after
the end of the Power-On state. When the timer has elapsed the
unit goes into the Ready mode.
READY: The unit waits for the external enable command to
generate power to the magnetron. The magnetron lament has
been heated.
The unit may remain in this state as long as needed: it auto-
matically exits should any alarm be generated or when the
”hibernate” command is set. When the ENABLE command is
set the unit enters into the “MW-ON” state.
MW-ON: When this appears on the LCD screen the unit is gene-
rating microwave emission at the preset power level.
The unit exits from this mode if:
* the enabling command is set OFF. It will now enter
the Ready state.
* any ALARM signal is generated. It goes into the
Alarm state.
* Hibernate signal is set ON.
ALARM: In this state the output power and the lament is
immediately shut-off.
The alarm type is indicated on the display.
The unit will exit the Alarm mode and enter the Reset Wai-
ting state only when the alarm cause is removed, the enable is
disactivated and the “RESET” signal (CONN#5) is activated.
RESET WAITING: The unit enters in this state when the alarm
cause is cancelled and the enable command is still present
(ON). The unit exits from this condition and enter in Reset
mode, only when the enable command is switched OFF.
RESET: This is a temporary state, driven by a two seconds
timer. When the timer is elapsed the Reset state ends and the
PM740 automatically enters the Stand-By status.
Description of the external commands.
HIBERNATE: has value ON/OFF.
- If ON the magnetron’s lament is not powered and the
PM740 goes into the Stand-by state.
- If OFF the lament is heated and when the related timer
has elapsed, the unit enters the Ready mode. The
heating timer value can be preset from the front panel.
- If a user does not wish to use the Hibernate function, it
may remain disconnected and the system will treat it as in
OFF condition.
POWER ENABLE: has value ON/OFF.
This signal will depend on the state of the HIBERNATE signal:
a) ENABLE OFF and HIBERNATE OFF
the unit performs lament preheating and goes in
Ready state but does not generate output power;
b) ENABLE OFF and HIBERNATE ON
the unit is in the Stand-by state but does not generate
output power;
c) ENABLE ON and HIBERNATE OFF
the unit awaits the end of preheating sequence and
then starts to generate output power provided that the
power set signal is > 10%.
d) ENABLE ON and HIBERNATE ON
the unit is the Stand-by state but does not generate
output power.
POWER SET: This is an analog input signal and set the level
of out power.
When its value is lower than 9% of full value the unit does not
generate any output power, when its value is greater than 9% of
full value the unit generates power proportional to signal value:
the signal is 0-10V.

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DISPLAY
1) Status indicator
Standby Head warm up or
reset wating
Ready Microwave ON
Alarm
2) Pulsed or continous mode
Continous Mode Pulsed Mode
3) Control mode
Remote External
Manual
4) Set point indicator
5) Software version
USER INTERFACE
At power on the LCD display shows the company’s logo and,
after few seconds, the unit enters in the working mode.
The unit, through the display, informs the user of its working
status, for example if pulse mode is active or not, control mode,
power set point and a user dened scale.
PARAMETERS SETUP
To modify internal unit parameters follow the menu diagram
on the next page, then read the specic instruction for every
parameter.
INFORMATION 1/3
• Magnetron. This indicates how many working hours the
magnetron has operated, it can be reset by the user from
the unit setup screen.
• Unit. This indicates how many working hours the unit has
operated, it can not be reset by the user.
• Last Alarm. This indicates the last alarm condition of the
unit.
• Forward Power. This indicates the percentage of forward
power coming from the external analog input. 10 Volts
on the analog input should be set to represent 100% of
forward power. Additional wiring and hardware is required
to implement this function.
• Reverse Power. This indicates the percentage of reverse
power coming from the external analog input. 10 Volts on
the analog input should be set to represent 100% of reverse
power. Additional wiring and hardware is required to
implement this function.
123 4
5

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Logo Alter
Run Scre en
Main M enu
Host
Comunication
Unit Setup 1/2
Pattern SetupInformation 1/3
Information 2/3
Information 3/3
OK On Prev
OK On Next
Unit Setup 2/2
Press
Esc
Press
Esc
Press
Esc
Press
Esc
Esc
OK On Next
OK On Prev
Press Esc
OK on Host
Com
OK on Unit
Setup
OK on Pattern
Setup
OK on
Information
OK on
Prev
OK su
Next
OK su
Prev
OK su
Next
OKsu
Prev
OKsu
Next
Press
Esc
Press
Esc
End Startup
Time
MENU DIAGRAM

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INFORMATION 2/3
• Anodic Voltage. Shows the anodic voltage of the magnetron.
In PULSED MODE it’s the peak value of Anodic Voltage.
• Anodic Continuous Current. Shows the magnetron’s
current in continuous mode.
• Anodic Peak Current. Shows the magnetron’s current in
pulsed mode.
• Ext. SetPoint. Indicates the percentage of external power
setpoint signal, derived from the external analog input.
10 Volts = 100% power.
• Enable Signal. Show the status of the external enable
signal. Note that this signal is edge sensitive and
not level sensitive.
INFORMATION 3/3
• CanBus. Indicates if the CANBus option is present or not*
• PC. Indicates if the comunication with RS232 is present or
not*
*Not Present in this version
PULSE PATTERN SETUP
• PULSE PERIOD. Shows the period of the pulse pattern.
If the user wants to change it, he has to highlight it, sets the
requested period with the encoder and then press the OK
button to save the new value.
• ON TIME. Shows the “ON time” of the pulse pattern. If
the user wants to change it, he has to highlight it, sets the
requested “ON time” with the encoder and then press the
OK button to save the new value.
• MAX ON TIME. Shows the maximum value of the “ON
time”. It sets automatically once the pulse period or the
“ON time” is changed.
UNIT SETUP 1/2
• Language. Available languages are English and Italian.
• Warm Up Time. Indicates the current set value for the
warm up time. It is adjustable from 2 to 60 seconds. To
change it highlight the correct row, set the new value with
the encoder and press OK to save the new value.
• Com Time Out. It is useful to set the maximum time gap
between two comunication sessions, after this time the
unit will generate a comunication time out alarm. It is
adjustable from 2 to 10 seconds, for more information see
the comunication protocol documentation.*
• Max Rev Pwr. This parameter allows the user to set a
maximim reverse power threshold. If the reverse power
input voltage exceeds this threshold the unit will generate
the max reverse power alarm. To change it highlight the
correct row, set the new with the encoder and press OK to
save the new value. To disable the alarm set this parameter
to zero.
• Min Fwd Pwr. This parameters allows the user to set a
minimum forward power threshold. If the forward power
input voltage drop under this threshold the unit will generate
the min forward power alarm. To change it highlight the
correct row, set the new with the encoder and press OK to
save the new value. To disable the alarm set this parameter
to zero.
*Not Present in this version
UNIT SETUP 2/2
• Control. It shows the unit control mode. Available values
are: Manual, External, PC*, CANBus*. The Manual mode
allow the user to set the power setpoint from the front panel
of the unit.The External mode allow the user to set the
power setpoint from a remote location by an analog signal
in the range of 0-10 Volts. The PC mode manage the unit
by a PC from the RS232 Port. CANBus Option allow the
user to set the power setpoint, Hibernate and Enable signals
from a remote location by a CANBus network. Note that the
enable and hibernate signal are, in these cases, the logical
AND of physical inputs and the software values.
• Show. This Parameter set what the user wants to see on
the screen while the unit is working. Available values
are, Power Anodic voltage, Anodic Current, Peak Power,
Forward Power, Reverse Power.
• Magnetron hours. Users have to reset this parameter when
the magnetron is replaced.
• An. Out. can be set what the user’s requirements. The
analogue output signals MON1 and MON2 can indicate one
of the following parameters: Off, Electric Power, Anodic
Voltage and Anodic Current, Forward and Reverse power.
HOST COMUNICATION
• This screen is used to communicate with an external host
(i.e. PC with CANBus or RS 232)*
*Not Present in this version

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Software upgrading
The software stored on the CPU can be upgraded to a newer
version through the RS232 serial port provided on the unit.
To perform this upgrade the following items are required:
- a PC
- a serial cable with 9 pin D type connectors, one male on
the equipment side, the female for the PC side. Wiring of
connectors must be 1:1 (pin 1 to pin 1, pin 2 to pin 2, etc.);
- the program “FlashPro32” to run under your PC, copies
available on request
- the latest version of software to upload into the PM740,
copies available on request
Upgrading procedure:
I) Switch OFF the PM740 - (Enable signal must be OFF).
II) Connect the serial cable to PC serial port and to RS232
serial port on the PM740.
III) Remove the top cover of the PM740.
IV) Locate the CPU board installed on the front panel and
set the programming switch to program.
V) Switch ON the PM740.
VI) Move the arm switch as indicated: The CPU is ready
to upload the new program into its “ash” memory:
this will cancel the existing program.
VII) Run the FlashPro and download from the PC the new
software: this will takes few minutes and FlashPro
will indicate the end of the upload.
VIII) During this operation the LCD will display a random
pattern. This is normal.
IX) When the procedure has been completed, return the
switch to its normal position.
X) Replace the cover of the PM740.
XI) Switch off the PM740 and wait 30 secs.
XII) Switch ON the PM740: one of the rst messages will
be the new version number.

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COMPONENT LAYOUT, bottom layer
COMPONENT LAYOUT, top layer

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Pos. Q.ty Description P/N Note
1 1 Main switch IG590XA323R
2 1 Canbus board M265 800000265
3 1 Transformer 42ATT230/003
4 1 CPU board M292 800000292
5 1 Digital potentiometer RSHRPG/AD3259R
6 2 Handles AR3636010
7 3 Fan, dim. 80x80x25 mm VE8412NGH
8 1 H.V. board M295 800000295
9 2 Air lter 461862015
10 1 Connector, 9 pins MODCS09F RS232
11 1 Connector, 25 pins MODCS25F Conn.#5
12 1 7 pins Socket, AMP/CPC MOCPC07/2061371 Conn.#1
13 1 7 pins Plug, AMP/CPC (*) MOCPC07/2061361
14 4 Female pin, size lll MOCPCX/0667402
15 4 Male pin, size lll MOCPCX/0662614
16 1 Main lter FL20AY01
17 4 Capacitor CR951A2K5
18 1 H.V. Socket, Lemo MOERAY/410 Conn.#3
1 H.V. Plug, Lemo (*) MOFFA1Y/410 (*)
19 1 Interface board M293 800000293
20 1 14 pin Socket. AMP/CPC MOCPC14/1826411 Conn.#2
21 1 14 pin Plug. AMP/CPC MOCPC14/1826491 (*)
22 14 Male pin, size lll MOCPCX/1630861
23 14 Female pin, size lll MOCPCX/1630881
24 2 Fuseholder for fuse10X38 mm FUP1891
2 Fuse 10X38 mm, 6A 500 V, cer. quick act. FU10X38/6A
25 1 7 pins Socket, AMP/CPC MOCPC07/2113981 Conn.#4
26 1 7 pins Plug, AMP/CPC (*) MOCPC07/2114001(*)
27 5 Female pin, size lll MOCPCX/1630881
28 5 Male pin, size lll MOCPCX/1630861
29 1 Power bridge DDSKD6212
30 2 IGBT module SKM100GB123D
31 1 Power board M294 800000294
32 2 Power resistor RSZ10010R
Component list (See drawing pag.13)
Note: Components marked with (*) are included on the con-
nector set p/n 44SET1150 to be ordered separately

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Pin out of CONN. #1

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Pin out of CONN. # 2, 3, 4

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Pin out of CONN. #5

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Pin out of serial port

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Alarm Code Description Cause/Solution
DRIVER
ALARM 0IGBT driver alarm
Possible problems on IGBT modules: if the problem
persists contact the technical service.
OVERCURRENT
ALARM 1Over Current detected
A current peak 5% higher than the max value
allowed has been detected.
Check High voltage cable for shorts.
LEAKAGE
ALARM 2Current Leakage detected
Check Connector # 3 for signs of arcing: in case
replace both socket & plug.
Check arcing on the magnetron head,
if damage detected replace the magnetron
UNDERVALUE
ALARM 3Low output current detected
The unit has detected an output current 10% lower
than expected, usually due by a sudden drop of the
main line voltage: check the main supply line or HV
cable disconnected.
VOLTAGE
ALARM 4Overvoltage detected
The output voltage exceeds the maximum allowed
voltage.
The warm up time is too short or there is a problem
with the lament connections.
ARC
DETECTOR 5
An arc in the
waveguide has
been detected
Check magnetron antenna condition. If any signs
of arcing clean and retry.
MAGN.
OVERTEMP. 6Magnetron over temperature
a) Check water ow and incoming water temperature.
b) Check magnetron thermoswitch (contact
grounded=OK, open=alarm).
c) Check setting of magnetron thermocouple: if latter
isn’t present the alarm threshold must be set = 0.
d) Check air ow.
e) Excess of reverse power. Reduce power
AIR FLOW
ALARM 7Low Air Pressure from head Check head air lter.
WATER FLOW
ALARM 8Low Water Flow in magnetron head Check water ow is > 2l/min.
ALARM CODES TABLE