ALTER SM1280 Series Specification sheet

SM1280D for line 3 x 208V
SM1280T for line 3 x 400V
SM1280U for line 3 x 480V
SWITCHING POWER GENERATOR
WITH EMBEDDED MICROCONTROLLER
FOR 6 KW MAGNETRON
TECHNICAL NOTE
(issue May 2009)
SM 1280

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SM 1280
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: SM1280 (power supply) and TM066 (microwave generator head)
nome del prodotto SM1280 (alimentatore elettrico) e TM066 (generatore di microonde)
model: SM1280D.xxx, SM1280T.xxx, SM1280U.xxx, TM066.xxx0
modello
Complies with the following norms:
Soddisfa le seguenti norme:
EN 61010-1: 2001; EN55011: 1999; EN55011/A1: 2000; EN55011/A2: 2003
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, May 2009. Marco Garuti
Presidente C.d.A.
Rev. Revision note Date File
0 First emission January 2009 SM1280_r0
1 Schematic diagrams corrected; alarm reset procedure added May 2009 SM1280_r1

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SM 1280
Alter’ policy about Reduction on Hazardous Substances (RoHS) and Waste
Electrical and Electronic Equipment (WEEE)
Law Reference
• Directive 2002/96/EC of European Parliament (WEEE)
• Directive 2002/95/EC of European Parliament (RoHS)
• Decreto Legislativo D.L. n. 151 – 25/07/2005 (WEEE and RoHS)
Starting from September 2005 Alter has set the rule to accept only RoHS compliant components from its Suppliers.
At the present date the 99% of components in our stock is RoHS compliant.
The components still not compliant were hold in stock and still used for two reasons:
• there is not the same or equivalent product RoHS compliant, or
• the product is a spare part for equipment produced and put on market before 1st July 2006.
Alter Risk Assessment on RoHS
Of the six substances forbidden from electronic equipment (Lead (Pb), Mercury (Hg), Cadmium (Cd), Hexavalent
Cromium (Cr-VI), Polybrominated biphenyls (PBB), Polybrominated diphenyl ethers (PBDE)) only two are used in
Alter’s current manufacturing process, Pb and Cr-VI, of whose lead is the more important.
Mercury: not present, never used
Cadmium: was present as part of alloy on relay contact. We are using relay RoHS compliant now.
Never used as anti-corrosion coating on metal parts.
Pbb & Pbde: may be present in some cables and insulating material in the past.
We are using only RoHS compliant suppliers and products now.
Cr-VI: No more used. May be present within the limit of 0,1% in weight as set by Directive.
Lead: it is largely used as an alloy for welding of electronic parts. We are already using alternative alloys
lead-free, but as we still have components that cannot be soldered without lead, we have to use some
lead-alloy for welding. At present there are still general concerns about reliability over the time of a
soldered electronic joint done without traditional Sn/Pb alloy. We are putting any effort on reducing
lead weight within 0,1% of products as set by Directive.
Important information to User about disposal, recycling, reuse of this electronic
equipment at the end of its useful life (WEEE Directive).
According to Annex IA and IB of EC Directive 200/96/EC this equipment is not included on the list of categories/
products covered by the Directive (as a matter of fact it does not perform a function alone, must be included into a
larger process equipment and it’s for stationary use).
Nevertheless we invite the User to respect the following Directive rules:
• this WEEE is not a municipal waste and should be collected separately according to rules of your country
• the symbol means that this WEEE cannot be disposal in the same place and in the same way like
municipal waste
• this WEEE may present risk for environment as well as for person in case of disposal in unauthorized
place, due to content of hazardous substances
• for disposal of this WEEE in unauthorized area the User may be charged with a ne or prosecuted by
law.

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SM 1280
Contents
A
Alarm troubleshooting 28, 29
B
Bit alarm table 6
BUS operation 13
C
CE Declaration 1
Cleaning 7
Components layout 19
Components List 20, 21
Conn.# 1 wiring vers. 0 - 1 - 2 15
Conn.# 1 wiring vers. 50 - 51 16
Conn.# 3, 4, 5 wiring 17
Conn.# 6 wiring 18
Conn. #8 wiring 13
Conn. RS232 wiring 14
E
Environmental conditions 7
Equipment installation 8
Equipment ratings 6
F
Firmware upgrade 11
Fuses replacement 7
Fuses specications 7
G
General description 4
General information 3
H
Handling instructions 8
Handling warnings 4
How to order 30
I
Internal settings 12
Internal wiring schematic 22, 23, 24, 25, 26, 27
M
Manual commands 10
Meaning of ext. command vers. 0-2-50 11
Meaning of ext. command vers. 1-51 13
Monitor signals 18
P
Power-up procedure vers. 0 - 2 - 50 9
Power-up procedure vers. 1 - 51 13
R
RoHS conformity 2
RS232 connector wiring 14
T
Technical assistance 30
W
Warnings 3
Wiring instructions 8
Working modes vers. 0 - 50 9
Working modes vers. 2 10
General Informations
This equipment satisfy 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) sets 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 equipments described in this manual have been classied
as industrial, scientic and medical (ISM) radio-frequency
equipments and the related standard for the emission is the
EN55011 (title: Limits and methods of measurement of radio
disturbance characteristics of ISM equipment.)
With reference to EN55011 standard, this equipment is inclu-
ded into Group 2 (Microwave generators, Thyristor command
equipment, Welding equipment, Induction heating equipment
or machine, Microwave industrial oven, etc.), Class A (indu-
strial environment): for this reason this equipment shall not
be used in the residential, commercial and light-industrial
environment.
The SM1280x and TM066, when properly installed, complies
with the limits of radio disturbance characteristic of a Group2,
Class A equipments as stated by EN55011.
Copy of the tests performed may be sent on request. Be aware
those tests cannot be used as a conformity certicate of the
user’s nal equipment.
WARNINGS
The SM1280 is powered by industrial main line and has
high voltage output (close 8 kV): read carefully this manual
before using. Be sure of correct connections and use.
Failure to comply with the instructions enclosed in this
manual may involve considerable risks for the staff respon-
sible 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 SM1280x 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 (35 kg = 77 lbs).
General Description
The SM1280x is able to supply the power required by a
magnetron type YJ1600 (National) or PM60 (Panasonic) or
H3881 (Hitachi) or AM3881 (Covimag), with nominal power
of 6 kW @ 2.45 GHz.
The output power can be adjusted continuously, from 10% up
to 100%, using an external analog signal from 1 to 10Vdc,
or by remote control, through ledbus interface or by front
panel commands, depending from model. The standard model
does not have any local command.
The unit, in addition to power the magnetron, has several
features and commands to control and power the magnetron’s
accessories.
The SM1280x has been developed to power and monitor our
remotable microwave head type TM066.
The SM1280x unit may also be used to power microwave
generators (heads) developed by others manufacturers under
condition that they are electrically compatible: moreover it is
mandatory to use our lament transformer FIL200 to guarantee
a proper lament reduction curve. See the electrical specica-
tions of the unit on the next pages.
The reduced height of the rack (only 7 HE, corresponding
to 310 mm) allows to use small cabinet, even in big plant:
i.e. in a standard cabinet with an height of 2 meters, arranged
to receive 19” racks, up to 5 SM1280x units may be easily
installed.
The user must provide a proper cooling ow: the cooling air
enter into the unit from the front side, it passes through the
internal circuits and components, then it goes out from the
back. The intake air ow is approx. 200 m3/h.
The SM1280 is designed to be an alternative of the existing
SM1180 serie, when is needed a network connectivity, not
available on the previous model.
The SM1280 is available in both European and Japanese/US
voltages.
The SM1280 carries new features mainly driven by the new
CPU core and is offered in four versions:
- “Basic” version (vers. 0) has only one RS 232 standard port,
which allows to drive/manage the unit with a simple software
(like our “Front Panel” package distributed freely).
- “Bus” version (vers. 1) which implements an industrial bus
interface like
- CANopen or
- Modbus/TCP or
- Probus,
allowing connection of multiple devices on the same bus.
-”Display” version (vers. 2) includes front panel commands
and LCD display as well as the features of the basic version.
- “Aux IN” version (vers. 50) has a separate connector for
input of Auxiliary voltage which allows to manage safety shut-
down of main power but keeping alive the unit’s CPU.
See the nal chapater “How to order” for more details and p/n.
SM1280 Range Overview
MODEL ABBREV. BASIC BUS DISPLAY AUX-IN
Version no. 0 1 2 50 51
External Control (PLC) [possible [ [ [
LED Panel Indicators [ [ n.a. [n.a.
Local Commands (Manual) n.a. n.a. [n.a. n.a.
Graphic Interface n.a. n.a. [n.a. n.a.
Network Control n.a. [n.a. n.a. [
RS 232 Control [n.a. [ [ n.a.
Separate Input for Aux Voltages n.a. n.a. n.a. [ [
Firmware Upgrade [ [ [ [ [

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Description of versions 0 - 1 - 50 -51
The front panel includes 5 status LEDs:
POWER ON (GREEN): ON when power is present
INTERLOCK ON (WHITE): ON when Interlock chain
is closed (=OK)
READY (YELLOW): ON when lament is ready
(Preheating timer is elapsed)
Flashing during preheating
time
MICROWAVE ON (BLUE): ON when microwave is
emitted (Enabling command
is ON)
ALARM (RED): ON when an alarm state is
present.
The rear panel comprises the following (see drawings):
1) 7 pins socket for main supply (CONN #1) [male]
2) 14 pins socket for mw head signals (CONN #4) [female]
3) socket for the high voltage output (CONN #5) [female]
4) 7 pins socket to power microwave head (CONN #3)[female]
5) 25 pins “D” type socket for I/O signals (CONN #6) [female]
6) RJ 45 on ETHERNET-MODBUS TCP interface, 9 pins “D”
type socket for CANOPEN/PROFIBUS interface [only models
with BUS interface, vers. 1 -51]
7) 9 pins “D” type socket for RS232 port [female]
8) fuse holders (F1, F2), screw type
9) 3 pins socket for main supply (CONN #7) [male, only
versions 50 - 51]
10) equipment label
11) BUS address switch [only models ves. 1 - 51]
WARNING!
REFER SERVICE TO QUALIFIED
PERSONNEL ONLY
.
MAY PRESENT RISK OF
ELECTRICAL SHOCK INSIDE!
ACHTUNG!
NUR FACHKRAFTE DIE WARTUNG
MACHEN MUSSEN
MAN SICH EINEN SCHLOG HOLEN!
ATTENZIONE!
LA MANUTENZIONE DEVE ESSERE
FATTA DA PERSONALE QUALIFICATO.
RISCHIO DI SCARICHE ELETTRICHE
ALL’INTERNO!
COLLEGARE ALLA TERRA
DEL GENERATORE REMOTO
VERBINDER DIRECT MIT DER
ERDUNG DES MIKROWELLEN GENERATOR
CONNECT DIRECTLY TO GROUND
OF MICROWAVE HEAD
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
BUS ADDRESS
CONN #6
CONN #4
CONN #3
CONN #1
CONN #8
CONN #2
CONN #7
F1 F2
ATTENZIONE!
USCITAALTA TENSIONE
WARNING!
HIGH VOLTAGE OUTPUT
WARNUNG!
HOCHSPANNUNGSAUSGANG
CONN #5
RS 232
46PP01280
1
2
4
8
3
6
7 5 11
9
CURRENT
DATES/N
POWER
INPUT FREQ.
REGGIO E. - ITALY
MODEL P/N
ar
e
t
l
KVA
V
A
Hz
10
REAR PANEL versions 0 - 2
WARNING!
REFER SERVICE TO QUALIFIED
PERSONNEL ONLY
.
MAY PRESENT RISK OF
ELECTRICAL SHOCK INSIDE!
ACHTUNG!
NUR FACHKRAFTE DIE WARTUNG
MACHEN MUSSEN
MAN SICH EINEN SCHLOG HOLEN!
ATTENZIONE!
LA MANUTENZIONE DEVE ESSERE
FATTA DA PERSONALE QUALIFICATO.
RISCHIO DI SCARICHE ELETTRICHE
ALL’INTERNO!
COLLEGARE ALLA TERRA
DEL GENERATORE REMOTO
VERBINDER DIRECT MIT DER
ERDUNG DES MIKROWELLEN GENERATOR
CONNECT DIRECTLY TO GROUND
OF MICROWAVE HEAD
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
BUS ADDRESS
CONN #6
CONN #4
CONN #3
CONN #1
CONN #8
CONN #2
CONN #7
F1 F2
ATTENZIONE!
USCITAALTA TENSIONE
WARNING!
HIGH VOLTAGE OUTPUT
WARNUNG!
HOCHSPANNUNGSAUSGANG
CONN #5
RS 232
46PP01280
1
2
4
8
3
6
7 5 11
CURRENT
DATES/N
POWER
INPUT FREQ.
REGGIO E. - ITALY
MODEL P/N
ar
e
t
l
KVA
V
A
Hz
10
REAR PANEL version 1
REAR PANEL versions 50 - 51
FRONT PANEL versions 0-1-50-51

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Description of version 2
The front panel of the “Display version” (vers. 2) includes a
graphic display and manual commands.
The unit can be driven manually through local commands,
alternatively via remote I/O discrete channels or via RS 232
serial port with our standard “FrontPanel” software. See the
relevant chapter “Equipment operation: User Interface” of
version 2 on next pages.
Equipment Ratings
SM1280D SM1280T SM1280U
Main supply (nominal): 3x208 V 3x400V 3x480V
Minimum main voltage: 3x190V 3x360V 3x420V
Maximum main voltage: 3x240V 3x450V 3x520V
Frequency: 50/60 Hz
Intake current @ V nom: 3x30Arms 3x18,5Arms 3x14,5Arms
Transient overvoltage: overvoltage cat. II
according IEC 664
Power factor: 1.11
Efciency: 92%
Max Output power: 8500 W
Max anodic mean current (CW): 1150 mA
(at the max ambient temp. of
40°C @ 200 m3/h ow)
Output ripple: +/- 2% (current)
Suitable magnetrons: 6kW (YJ1600-H3881-
PM060-AM3881)
Filament trafo type: FIL200F
Filament control: software controlled
curve
Filament preheating: automatic at power-on
Enable, Hibernate input: 24 Vdc (range 3÷30Vdc)
optoinsulated, input impe-
dance = 4700 ohm
Monitor 1 output signal: 0÷10 V, with 1V= 1.000V
for anode voltage
Description BIT 3 BIT 2 BIT 1 BIT 0
No alarm 0 0 0 0
Magnetron Overtemperature 0 0 0 1
Rack Overtemperature 0 0 1 0
Arc Detection (on head) 0 0 1 1
Overcurrent 0 1 0 0
Overvoltage 0 1 0 1
Air Pressure Low (on head) 0 1 1 0
Water Flow Low (on head) 0 1 1 1
Interlock 1 0 0 0
Current Leakage on Ground 1 0 0 1
Rack Alarm 1 0 1 0
not implemented 1 0 1 1
not implemented 1 1 0 0
not implemented 1 1 0 1
Communication Interrupted 1 1 1 0
Bus Communication Failed 1 1 1 1
BIT ALARM TABLE
FRONT PANEL version 2
Monitor 2 output signal: 0÷10 V, 1V= 200 mA
for anode current
Note: Monitors outputs are designed for a receiver impedance
of at least 30 kOhm (to guarantee a maximum error of 1%)
Alarm, Alarm Code,
MW Ready output contacts: max load = 24V - 0,5 A
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 MW Ready contact:
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
or lament preheating not completed : contact open
Output stability: within 1% with input
uctuations within +/-10%
Reference signal to set power: 0-10 Vdc (Z=100 kOhm,
optoinsulated)
Management of alarms: a) by internal alarm relay contact
b) emission of the 4-bit code on the
signals connector: see table below)
Alarm reset: all alarms are latched; to reset an
alarm, remove ENABLE input for at
least 2 seconds.

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Environmental conditions
Use: Indoor use only
Altitude: tested up to 2,000 m
Temperature: 5°C to 40°C (41°F÷104°F)
@ 200 m3/h cooling ow
Relative Humidity: 80% RH up to 31°C(88°F),
decreasing linearly to 50%
RH at 40°C (104°F)
Pollution degree: 2, complies with IEC664
Physical characteristics
Front panel dimensions: 19”x 3HE (482 x 133 mm)
Rack total width: 444 mm
Rack total height: 301 mm
Rack depth (without handles): 482 mm
Housing board depth (minimum): 600 mm
Total weight: 35 kg (77 lbs)
Intake air ow: approx 200 m³/h
Fuses specications
The SM1280x has 2 fuses installed on the rear panel (look at
the drawing on page 5, position 8): both fuses, labelled F1 and
F2, protect the output line powering the remote head.
A third fuse is on the main board M416, to protect internal
control circuitry.
Fuse F1 and F2 specs:
- Size, type: 10x38 mm, ceramic cartridge
- Speed action: quick (F)
- Rated current: 6 A
- Rated voltage: 500 V
Fuse F1 specs on M416 board:
- Size, type: 5x20 mm
- Speed action: slow (T)
- Rated current: 2A
- Rated voltage: 250 V
Equipment maintenance
Cleaning
Cleaning of air inlet: 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.
Fuses replacement
To replace the fuses on rear panel proceed as follow:
- switch-off the unit, removing main line from the equipment;
- unscrew fuseholder cap;
- replace the fuse with a new one with the same electrical cha-
racteristics;
- inspect also the fuseholder: if it’s oxidated or it has burned
point then replace it;
- install the fuseholder cap and screw tight.
Internal fuse:
- switch-off the unit, removing main line from the equipment
- remove the unit cover, unscrewing the 6 screws on sides
- locate the fuseholder on M416 pcb: push the cap then rotate it
without any tool (gently!), pull up the cap and inspect the fuse;
- replace the fuse with a new one with the same electrical cha-
racteristics
- install the fuseholder cap: push it then rotate.
- reassemble the unit cover, screwing the 6 screws on sides

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Equipment installation
The SM1280x cannot operate on a bench: it must be installed
into a proper cabinet like a commercial 19” standard enclo-
sure.
The equipment is intended for industrial use only, not for
laboratory use, and user must respect the wiring norms and
prescriptions as described into next paragraph (“Wiring
instruction”).
The equipment cannot 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 15(h) x 30(l) x 2 (thick) are
suitable for that 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 precau-
tions must be taken to avoid operations on rear fuses or on
connectors while the unit is still powered.
Special attention must be taken on designing the cooling air
ow in case of stacking several units into the same cabinet.
Note that each equipment has its own fan which intake approx
200 m³/h: the outlet of the exhaust air is on rear panel, the
inlets on the right side (looking at front).
When designing a board to house several units we recommend
to adopt the following design criteria:
1. use a standard 19” wide enclosure with a depth of 800 mm
(32”);
2. allow free intake of the cooling air from the front of the
cabinet and exhaust air from back panel throu the top of the
cabinet or the back side;
3. 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;
4. provide a separation between the air intake duct and the air
outlets, in order to avoid air-recyrculating;
Handling instructions
The equipment weight is 35 kg (77 lbs). Always lift from the
bottom and use an adeguate rugged support to avoid personal
injury and damage to equipment itself.
In case of shipping, package with the original package or use
a wooden case and a proper ller: movement of the equipment
inside the package must be avoided.
Warning for handling: use handles only for help during
installation. Never use handles to lift the rack: the handles
don’t withstand the off-center weight of the rack!
To lift always lean the rack over a proper supporting base.
Wiring instructions
The SM1280 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 the connector #1
using pin 4 (see the wiring diagram at page 15, 16).
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 must be provided through connector #1:
connect phases according to schematic at page 15 & 16: the
connector’s pins for model T & U can accept wires with gauge
up to 4 mm²; the connector’s pins for model D can accept
wires with gauge up to 10 mm²;
Warning: this connector is not intended for live insertion of
the unit: an external tripolar breaker must always be pro-
vided, and the unit must be switched off before inserting/
unplugging of the connector.
IV) The connector #4, with 14 pins, brings the head’s signals
to the equipment. Use wires with max gauge of 1.5 mm², refer
to wiring diagram at page 17.
V) The connector #5 is the high voltage output and must be
connected to magnetron’s cathode, usually marked with the
symbol “FA” on the magnetron’s teminal. The voltage value is
near -8 kV .Use a proper insulated cable with working voltage
>10 kVdc and minimum gauge of 0.25 mm²; protect the wire
with sheating (armoured if appropriate).
Assemble the wire into plug according to professional rules.
The reliability of the equipment starts from the h.v. connec-
tions.
ALTER may supply the HV cable with lenght on request.
VI) The connector #3 provides the power supply for the
lament transformer (usually located near the magnetron), the
magnetron fan and a warning lamp. Use wires wih max gauge
1.5 mm². Refer to wiring diagram at page 17;
VII) The “D” type female connector #6 has 25 pins and brings
the I/O signals to the equipment. Refer to wiring diagram at
page 18.
VIII) The CONN# 8 is present only in version 1 and 51. The
type of socket depends on the eldbus interface:
- RJ 45 on Ethernet-Modbus TCP
- 9 pin “D” on CANopen/Probus
IX) The “D” type female connector RS232 has 9 pins and it’s a
standard serial port, that can be used to upgrade of the software
from a PC, or to retrive internal data through FrontPanel GUI.
Look the pin-out at page 14.
X) The user must provide external cut-off device, to protect the
SM1280 from short-citcuit and thermal runaway; this external
protection device must also allow to switch-off the main line
for maintenance operations.
XI) The external circuit breaker must be a 3-poles current limi-
ter breaker and must comply the norm EN61010-1.
XII) The external circuit breaker must be in close proximity of
the equipment and within easy reach of the operator.
XIII) The external circuit breaker must be marked as the

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disconnecting device for the SM1280.
XIV) The connector #1 must never be used as a switch-off
device.
Failure to comply with these instructions may involve con-
siderable 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
when working with versions allowing
External Control (vers 0 - 2 - 50)
Power-up procedure
Before powering-up the equipment, double check to have
properly connected it, (look at the chapter “Wiring Instruction”
for any doubt) then power on the unit through your external
contactor.
Once switched OFF wait at least two seconds before setting it
ON again.
The OFF state, between two consecutive ON state, must last
two seconds minimum.
At power on the unit enters into a “BOOTLOADER” state for
few seconds to allow rmware upgrade, then it goes imme-
diately into “STAND-BY” and here waits until the “lament
heating” is completed. If the unit is remotely driven, it is
necessary to remove the default Hibernate command, that
prevents the hardware from heating the lament.
If any alarm is present, the units stops, and the lament is off.
At the end of the heating cycle the unit enters in “READY”
mode: the power supply may power the magnetron, which
generates microwave, only when it will receive the enabling
command.
Any type of alarm forces the unit to exit from thr “READY”
state and enters it in “ALARM” state.
In absence of alarms the power supply may be left in “Ready”
continuously: when it receives the enabling command (ON) it
enters into “RF-ON” state and generates output power, when
the enabling command is removed (OFF) the unit comes back
to “READY” state.
Working Modes
(vers 0 - 50 only)
The behaviour of the SM1280x depends on its “working
status”: it has several statuses with different meaning and
functionality. The logic ow of these statuses is showed on the
following drawing.
These statuses are:
BOOTLOADER: it goes in this mode at power-on, waits for any
serial rmware update data, and after a few seconds, the unit
enters in Stand-By mode.
STANDBY
PREH
RUN
READY
HIBERNATE=0 &
INTERLOCK=1 &
ALARM=0
HIBERNATE=1 or
INTERLOCK=0 or
ALARM=1
HIBERNATE=0 &
INTERLOCK=1 &
ALARM,=0 &
TIME<15s
HIBERNATE=1 or
INTERLOCK=0 or
ALARM=1
HIBERNATE=0 &
INTERLOCK=1 &
ALARM,=0 &
TIME>15s
HIBERNATE=0 &
INTERLOCK=1 &
ALARM,=0 &
ENABLE=1
HIBERNATE=0 &
INTERLOCK=1 &
ALARM,=0 &
TIME>15s &
ENABLE=0
HIBERNATE=0 &
INTERLOCK=1 &
ALARM,=0 &
ENABLE=0
HIBERNATE=1 or
INTERLOCK=0 or
ALARM=1
HIBERNATE=0 &
INTERLOCK=1 &
ALARM,=0 &
ENABLE=1
BOOT
LOADER
TIME>2S
STAND-BY: it’s a waiting state, the unit is powered but not ready
as the magnetron lament is not powered; all the working
parameters can be setted from Operator Panel; the unit enters in
Stand-By from the previous Bootloader state or when an alarm,
or hibernate condition is true.
The unit exits from Stand-by and goes to Preheating only
if there aren’t alarms, the Interlock chain is closed and the
HIBERNATE command is OFF.
PREHEATING: it’s a temporary state, driven by a timer, to allow
the lament to be heated. The unit enters in this mode after a
remote command or automatically after the end of Bootloader
state. When the timer is elapsed the unit goes in Ready mode.
READY: it’s a waiting state. The unit waits the enabling com-
mand to generate power to the magnetron. The magnetron
lament has been, and is properly heated.
The unit may last in this state as long as needed: it exits auto-
matically in case of alarm or when the ”Hibernate” command
is asserted. It goes to next “MW-ON” status when the enabling
command is set ON.
MW-ON: starts microwave emission at the presetted power level
while the led “MW ON” is lighted up.
The unit exits from this mode in case of:
* the enabling command is set OFF: enters into Ready state, or
* ALARM presence: the unit goes to Stand-by, or
* the INTERLOCK chain is open: it goes to Stand-by again.
* the Hibernate command is set to ON: jump to Stand-by.
Look at the status diagram for the working mode logic:

page 10 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 11 of 30
SM 1280
Working Modes
(vers 2 only)
The version 2 has a graphic display, some manual commands
on the panel and may be driven manually, as well as by
external commands (PLC) and thru the RS 232 port using the
software “FrontPanel” (supplied on request or downloadable
from our web site).
The behaviour of SM1280 vers. 2 depends on its working
status: the logic  ow of these statutes is showed in the next
drawing:
At power ON the
display shows
initially the software
release, then the unit
starts the preheating
of the  lament: after
10 seconds, if no
alarm is present, the
unit enters in Ready
state.
If the hardware
command “Power
Enable” is active
(ON) the unit starts
to power the magne-
tron and microwaves
are emitted from the
head: the power level
is read (and driven) from the manual knob on the panel.
Change from one state to another is similar to other version
and the relevant information is showed on the display.
Manual Commands
On the front panel there are three push-buttons and one knob.
ESC allows to swap from one page to another, TAB (the
button with the arrow) to scroll down the selection, ENTER to
con rm the selection.
The knob allows to modify a value when this is enabled.
The manual commands are active only when the related
option is enabled: if it is not then the unit can run only with
External commands.
It’s the default page at Power
ON. This view reports the sof-
tware version and lasts only few
seconds.
Second page, informing the unit is
heating the magnetron’s  lament:
it lasts until the heating timer has
 nished, at least 10 seconds. No
command is effective.
If this page doesn’t show up,
it means there is an alarm state
active that forbid the preheating (a
relevant message is displayed)
The  lament is hot and no alarm
is present: the unit is ready to
power the microwave head. The
lower row indicates the presetted
value of output power.
The SM1280 is powering the
microwave head at the % indica-
ted on display.
Software Menu Description
This is the set-display submenu:
it allows to select what to display.
Options available:
- % Output Power
- Output Power of psu (W)
- computed Microwave Power (W)
Example of selection to display
Microwave Power
Example of selection to display
all information at a glance

page 10 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 11 of 30
SM 1280
This is the set-mode submenu: it
allows to select Manual or Exter-
nal Control.
In Manual mode the power can be
adjusted using the panel knob. In
External Control mode the manual
commands are not effective.
This is the set-ef ciency sub-
menu: it allows to enter the
estimated value of magnetron
ef ciency, range: 0-100% . If
you select 100% the “Microwave
Power” corresponds to the output
power of the psu.
When the unit is in Alarm state
the cause is displayed untill the
alarm is removed.
rate any output power, when >1Vdc the unit generates power
proportional to this signal value.
The CPU drives the unit to obtain an electrical output power
(Va * Ia) value proportional in a linear way to the reference
input signal. The scaling is 850W/V.
INTERLOCK FUNCTION: managed throu CONN# 4, pin 5 -
6, “MICROSWITCH ON COVER”. It is an external hardware
chain of contacts, that must be closed all at the time to have
the internal relay closed. (ON condition). When in ON the
CPU light-up the related Interlock OK led; in OFF state the led
is Off and the unit goes in Stand-by, as all dangerous voltages
on the head connector are off.
HEAD ENABLE 1, 2: CONN# 4, pin 7 - 9; CONN# 6, PIN
10 - 23 not implemented yet (version 1.0.1). Do not use, they
have no meaning.
Firmware upgrade
The software stored on the CPU ( rmware, on a  ash
memory) can be upgraded to a newer version using the RS232
serial port on the unit, connected to a PC.
Important remark: at power-on, even if a program is already
stored, the microprocessor enters a “BOOTLOADER” status,
lasting 2 seconds, during which it is possible to overwrite,
through the serial RS232 port, the stored code.
If no new code is loaded within 2 seconds, the previously stored
one is run.
To upload a new program through the bootloader, simply
connect the SM1280 serial port to the PC serial port, using a 9
pin 1:1 cable (only TX, RX and Ground are used, but also a full
cable will  t. See schematic on page 14)
No external switch must be operated, and the unit does not start
until the new program is stored, but be sure no enable signal is
active when upgrading.
The upgrade of the  rmware embedded in the SM1280 is
released as a .zip archive named “program_name.zip”.
Unpacking the .zip archive you generate:
- a directory named “program_name” containing the micro
code to be loaded,
- an executable program named “SendApplicationProgram.bat
”- and the loader “sRecLoad.exe”.
Once unpacked the .zip program
- enter in the folder “program_name”,
- switch-on the SM1280
- run whithin 2 seconds the program “SendApplicationProgra-
m.bat” (which launches sRecLoad.exe application)
(This is the maximum time that the microprocessor bootloader
waits for new code to be loaded).
Meaning of external commands.
(vers 0 - 2 - 50)
HIBERNATE: has value ON/OFF. If ON the magnetron’s
 lament is not powered and the SM1280 goes into Stand-by
mode.
In OFF the unit makes  lament heating and, when the related
timer is elapsed, enters in Ready mode.
If a user don’t like to use the Hibernate function, he may not
connect the HIBERNATE control signal: the system then
detect it as in OFF condition.
POWER ENABLE: has value ON/OFF, but its effect is rela-
ted also with the Hibernate command as follow:
a) in OFF state - and HIBERNATE is OFF - the unit performs
 lament preheating and goes in Ready mode but does not
generate output power, even if the reference signal is >0;
b) in OFF state - and HIBERNATE is ON - the unit is in
Stand-by mode but does not generate output power, even if
the reference signal is >0;
c) in ON state - and HIBERNATE is OFF - the unit waits
the end of preheating timer, if not yet elapsed, then starts to
generate output power;
d) in ON state - and HIBERNATE is ON - the unit is in
Stand-by mode but does not generate output power, even if
the reference signal is >0.
POWER SET: it’s an analog input value and has the meaning
of “desired percent” of the full output power (8500W)
When this value is lower than 1Vdc the unit does not gene-

page 12 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 13 of 30
SM 1280
During the bootloader wait time, the red ALARM led is on: if
no code is sent, then the previous code is executed, and it is not
possible to change it without switching the unit off.
In case the program sRecLoad.exe sends data whithin 2
seconds, the microprocessor bootloader stores the new data
on the internal ash memory, installing the new release, and
automatically executes it when the download is done.
Internal settings
The SM1280x comes in the default settings, and no setting
is required; nevertheless some working parameters can be
modifyed using internal dip-switches.
DIP-SWITCH #1 (on board M416.x): allows to override some
external alarms, as follow
SW1-1 if set to ON disables ARC DETECTOR alarm.
SW1-2 if set to ON disables MAGNETRON THERMAL alarm
SW1-3 if set to ON disables AIR FLOW alarm
SW1-4 if set to ON disables H2O FLOW alarm
SW1-5 if set to ON disables INTERLOCK input
SW1-6 if set to ON disables MICRO CARTER alarm
SW1-7 if set to ON inhibits the automatic opening of the
SW2
NORMAL OP.
HARDWARE
FIXED
TEST
FIELDBUS
PM60
H3881
ON OFF
ON OFF
ON OFF
ON OFF
YJ1600
ON OFF
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CPU POWER
HEAD INTERFACE POWER
PLC INTERFACE POWERING
HEAD INTERFACE (CONN#2)
HEAD POWER OUT (CONN#4)
230Vac BOARD POWER
LED BOARD
FIELDBUS INTERFACE
RS232 INTERFACE
M416.1 CONNECTORS, TEST-POINTS, LEDS
TRIMMERS, DIP-SWITCHES, JUMPERS
DIP-SWITCH#2
DIP-SWITCH#1
FILAMENT VOLTAGE ADJ.
PTC ON HEATSINK
FAN POWER
DRIVER COMMAND
PARAMETERS SENSING
CONTROL I/O (CONN#5)
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interlock relay from the CPU in case of alarm. If it is ON, only
the opening of the MICRO CARTER switch can de-energize
the interlock relay, cutting in this way the head supply and
leaving the head in a safe condition.
SW1-8 – not used.
DIP-SWITCH #2 (on board M416.x)
Switches 1 and 2 (SW2-1 and 2-2) select the type of lament
cut-back curve according magnetron specs: see the following
table.
SW2 - 2 SW2 - 1 Magnetron type
0 0 YJ1600 National
0 1 H3881 Hitachi /
AM3881 Covimag
1 0 PM60 Panasonic
1 1 Filament xed @5V
SW2-3 if set to OFF enables the external control of the unit,
set to ON enables the eldbus control.
WARNING: in this case, if no eldbus interface is present
or if no communication is present on the bus an alarm is
generated.
SW2-4 must be set to OFF for normal operation, if set to
ON enables the hardware test of the M416 board.
WARNING: don’t enable this switch: the use is limited to
trained personal only and for test purposes.

page 12 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 13 of 30
SM 1280
Equipment operation
with versions having network capability
(vers 1 -51)
Power-up procedure
Before powering-up the equipment, double check to have
properly connected it, (look at the chapter “Wiring Instruction”
for any doubt) then power on the unit through your external
contactor.
Once switched OFF wait at least two seconds before setting it
ON again.
The OFF state, between two consecutive ON state, must last
two seconds minimum.
Meaning of external commands (vers. 1-51)
With psu having network capability, like CANOpen (p/n
ending xxxCAN) or Modbus/TCP (p/n .....MTCP) or Probus
(p/n......PROF) it’s mandatory to provide the physical signals
of “Power Enable” and “Interlock” (see the schematic of the
signals connector on next pages) otherwise the unit will not
respond to any bus command.
POWER ENABLE: has value ON/OFF, in ON state the com-
mands sent on the bus line are accepted and managed; in OFF
state the external commands don’t have any effect.
INTERLOCK: it is an external hardware chain of contacts,
that must be closed all at the time to have the internal relay
closed. (ON condition). When in ON the CPU light-up the
related Interlock OK led; in OFF state the led is Off and the
unit goes in Stand-by, as all dangerous voltages on the head
connector are off.
BUS operation
For protocol explanation refer to relevant Application Note.
The working status for these versions is the same of other
version (read the chapter “Working Modes” for version 0 at
previous page): the status is then provided thru messages sent
on the bus.
Each SM1280 unit, wired in a network bus, must be associated
to a node address.
There are several ways to set the device address, depending
from the type of bus, but in general it can be set in hardware
using the 2 rotary Dip Switches on the rear panel of the unit
(pos. 11 in the previous drw) , above CONN #8 (pos. 6, same
drw).
Looking at the panel the left switch sets the tens, the right sets
the units.
A value from 1 to 99 can be set, while node 00 is usually
reserved and must not be used (consult the specic software
documentation).
The bus is based on a network interface device named
“AnyBus CompactCom”(*) manufactured by HMS Industrial
Networks(**): for general information consult http://
www.anybus.com.
For specic document on the protocol and related technical
information search for product type Anybus-CompactCom.
I.e. a specic document on the Modbus/TCP protocol is 367-
2973-ABCC-MTCP_IT_2_04.pdf
Note:
* AnyBus logo, HMS logo, AnyBus CompactCom name are register
trademark of HMS Industrial Networks AB
** HMS Industrial Networks AB, Stationsgatan 37, 302 45
HalmstadSweden
The bus connector (CONN. #8) may differ in style from bus
type, but the LED associated have common meaning and
functionality. In the next drawing is depicted the Modbus/TCP
style (RJ45).
WARNING!
REFER SERVICE TO QUALIFIED
PERSONNEL ONLY
.
MAY PRESENT RISK OF
ELECTRICAL SHOCK INSIDE!
ACHTUNG!
NUR FACHKRAFTE DIE WARTUNG
MACHEN MUSSEN
MAN SICH EINEN SCHLOG HOLEN!
ATTENZIONE!
LA MANUTENZIONE DEVE ESSERE
FATTA DA PERSONALE QUALIFICATO.
RISCHIO DI SCARICHE ELETTRICHE
ALL’INTERNO!
COLLEGARE ALLA TERRA
DEL GENERATORE REMOTO
VERBINDER DIRECT MIT DER
ERDUNG DES MIKROWELLEN GENERATOR
CONNECT DIRECTLY TO GROUND
OF MICROWAVE HEAD
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
BUS ADDRESS
CONN #6
CONN #4
CONN #3
CONN #1
CONN #8
CONN #2
CONN #7
F1 F2
ATTENZIONE!
USCITA ALTA TENSIONE
WARNING!
HIGH VOLTAGE OUTPUT
WARNUNG!
HOCHSPANNUNGSAUSGANG
CONN #5
RS 232
46PP01280
1
2
4
8
3
6
7 5 11
CURRENT
DATES/N
POWER
INPUT FREQ.
REGGIO E. - ITALY
MODEL P/N
ar
e
t
l
KVA
V
A
Hz
10
LED State Description
Off No Power or no IP address
Green Module is in Process Active or Idle state
Green, ashing Waiting for connections
Red Duplicate IP address, or FATAL event
Red, ashing Process Active Timeout
Network Status LED: A test sequence is performed on this
LED during startup
# Item
1Network Status LED
2Module Status LED
3Link/Activity
4Ethernet Interface

page 14 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 15 of 30
SM 1280
RS232 connector wiring
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Link/Activity LED:
LED State Description
Off No link, no activity
Green Link established
Green, ashing Activity
Each module is galvanically insulated. A standard “straight”
Ethernet RJ45 cable can be used to establish a connection
between SM1280 psu and the PC or HUB device.
The ethernet interface supports 10/100Mbit, full or half duplex
operation.
At Power ON the device does not activate any Process
Timeout. This condition means that once the device has
entered a “Process Active” state after the rst command,
if the MASTER stops to run (for any reason), the SM1280
power supply does not detect any abnormal situation and keep
running the output in the state they were.
On contrary, if the Process Active TimeOut value (consult the
software documentation for the specic bus) has been set to a
value greater than zero, it stays in Process Active Status only
if the MASTER continues to send related messages: once the
MASTER stops sending correct messages, the power supply,
at the end of “Process Active TimeOut” milliseconds, enters
the IDLE state and switches OFF all the outputs (analog and
digital).
We strongly recommend to set the Process Active Timeout
value.
A special software toolkit is available to support testing and
development for Modbus/TCP and CanOpen applications:
the product is sold separately from the power supply and is
described on relevant Application Note AN80xx.
The toolkit provides a ready to use software for PC running
Win-XP® or Vista® o.s. and an easy graphic interface to verify,
change, enable the discrete I/O of the power supply.
Module Status LED: A test sequence is performed on this
LED during startup
LED State Description
Off No Power
Green Normal operation
Red Major fault; module is in state EXCEPTION
(or FATAL event)
Red, ashing Minor fault

page 14 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 15 of 30
SM 1280
Connector # 1 wiring (vers. 0 - 1 - 2)

page 16 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 17 of 30
SM 1280
Connector # 1 wiring (vers. 50 - 51)

page 16 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 17 of 30
SM 1280
Connector # 3,4,5 wiring
14
13
12
11
7
3
8 4
1
2
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page 18 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 19 of 30
SM 1280
Connector # 6 wiring
SM1280X OPTO-INSULATED CONTROL INTERFACE
25
14
CONN.#6 (D-SUB 25 PIN F)
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MONITOR SIGNALS
valid for all versions
On the “D” type fermale connector #6, installed on the rear panel
of the PSU, there are two monitor signals, in the range 0 - 10Vdc
(pin 2 and pin 3, ground on pin 15 and 16 respectively)
Magnetron voltage and
current Monitor CONN. #6
Output Voltage Va
1 Vmon= 1000 V
Pin #2
(return on pin #15)
Output Current Ia
1 Vmon= 200 mA
Pin #3
(return on pin #16)

page 18 of 30 File: SM1280_r1eng - May 2009 - Technical note: SM1280
SM 1280
File: SM1280_r1eng - May 2009 - Technical note: SM 1280 page 19 of 30
SM 1280
COMPONENT LAYOUT