MKS SM 1280 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 April 2017)
SM 1280

(Cover Rear)

File: SM1280_r7eng -April 2017 - Technical note: SM1280 page 1 of 27
SM 1280
SM 1280
CE Declaration of Conformity
Dichiarazione di Conformità CE
Manufacturer’s Name: MKS Instruments Italy s.r.l
Nome del Costruttore:
Manufacturer’s Address: Via Curie, 8 - 42122 Reggio Emilia - Italy
Indirizzo del Costruttore:
Product Description: Power supply for microwave generator
Descrizione del Prodotto: Alimentatore per generatore di microonde
Product Name: SM1280 (power supply) and TMx66- TM060(microwave generator head)
Nome del Prodotto: SM1280 (alimentatore elettrico) e TMx66 (generatore a distanza)
Model: SM1280D.xxx, SM1280T.xxx , SM1280U.xxx - TM066.xxx1 - TM060.xxx1
Modello:
The product described above is in conformity with the provision of the following European Directives:
Il prodotto sopra descritto è in conformità con le seguenti Direttive Europee:
2014/35/CE Harmonisation of the laws of the member States relating to electrical equipment designed for use within
certain voltage limits
Riavvicinamento delle legislazioni degli Stati membri relative al materiale elettrico destinato ad essere
adoperato entro taluni limiti di tensione
2014/30/UE Harmonisation of the laws of the member States relating to electromagnetic compatibility
Riavvicinamento delle legislazioni degli Stati membri relative alla compatibilità elettromagnetica
Conformity to the Directives is assured through the application of the following standards:
La conformità alle Direttve è assicurata tramite l’applicazione dei seguenti standards:
Reference number Edition Description
Numero di riferim Edizione Descrizione
EN61010-1 2011-03 Safety requirements for electrical equipment for measurement, control and laboratory use
Prescrizioni di sicurezza per apparecchi elettrici di misura, controllo e per utilizzo in laboratorio
EN61000-6-4 2007-11 Electromagnetic compatibility - Generic emission standard, industrial environment
Compatibilità elettromagnetica - Norma generica sull’emissione, ambiente industriale
EN61000-6-2 2006-10 Electromagnetic compatibility - Generic immunity standard, industrial environment
Compatibilità elettromagnetica - Norma generica sull’immunità, ambiente industriale
Reggio Emilia, April 2017. Marco Garuti
General Manager

page 2 of 27 File: SM1280_r7eng -April 2017 - Technical note: SM1280
SM 1280
Policy about Reduction on Hazardous Substances (RoHS) and Waste Electrical and Electronic Equipment
(WEEE)
Law Reference
• Directive 2012/19/EU of European Parliament (WEEE)
• Decreto Legislativo D.L. n. 49 – 14/03/2014 (WEEE)
• Directive 2011/65/Eu of European Parliament (RoHS)
• Decreto Legislativo D.L. n. 27 – 4/03/2014 (RoHS)
Risk Assessment on RoHS
The SM1280 magnetron power supply is RoHS compliant.
Important information to User about disposal, recycling, reuse of this electronic equipment at the end of its
useful life (WEEE Directive).
According Directive 2012/19/EU 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.
Rev. Revision note Date File
0 First emission January 2009 SM1280_r0
1 Schematic diagrams corrected; alarm reset procedure added May 2009 SM1280_r1
2 CE declaration updated, new software release added December 2009 SM1280_r2
3 Application note reference AN 10290 October 2010 SM1280_r3
4 Software info added, TM060 v.1 head August 2012 SM1280_r4
5 New versions 20 (=1180) & 32 (RS485), logo update, removal int. schematic September 2013 SM1280_r5
6RoHS compliance statement. New version 22 direct replacement SM1180.
Removal vers. 32 (RS 485 serial command) September 2016 SM1280_r6
7 Updated norms. April 2017 SM1280_r7

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SM 1280
SM 1280
Contents
A
Alarm troubleshooting 25, 26
B
Bit alarm table 19
BUS operation 14
C
CE Declaration 1
Cleaning 8
Components layout 21
Components List 22, 23
Conn.# 1 wiring vers. 0 - 1 - 2 -20-32: 16
Conn.# 1 wiring vers. 50 - 51 17
Conn.# 3, 4, 5 wiring 18
Conn.# 6 wiring 19
Conn. #8 wiring 14
Conn. RS232 wiring 20
Conn. #2-6 , wiring vers. 22 20-21
E
Environmental conditions 8
Equipment installation 8
Equipment ratings 9
F
Firmware upgrade 12
Fuses replacement 6
Fusesspecications  6
G
General description 4
General information 3
H
Handling instructions 9
Handling warnings 4
How to order 27
I
Internal settings 13
M
Manual commands 11
Meaning of ext. command vers. 0-2- 50 12
Meaning of ext. command vers. 1-51 14
Monitor signals 19
P
Power-up procedure vers. 0 -2 -0-50 10
Power-up procedure vers. 1 - 51 14
R
RoHS conformity 2
RS 485 version info (vers. 32) 15
T
Technical assistance 27
W
Warnings 3
Wiring instructions 9
Working modes vers. 0 - 50 10
Working modes Bus vers. 1 - 51 14
Working modes vers. 2 -20-32 11
General Informations
TheseequipmentsatisestheEuropeanStandardEN61010-1
With reference to EN 61010-1 standard, note:
these power supplies must be installed and serviced only by
qualiedpersonnel.
These power supplies must only be used by persons acquainted
with the regulations covering the application.
Theequipmentdescribedinthismanualhasbeenclassiedas
industrial,scienticandmedical(ISM)radio-frequencyequip-
ment and the related standard for the Electromagnetic distur-
banceistheEN55011(Industrialscienticandmedical(ISM)
radio-frequency equipment - Electromagnetic disturbance
characteristics - Limits and methods of measurement.)
With reference to Basic Standard EN55011, these power
supplies are 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 these
power supplies shall not be used in the residential, commercial
and light-industrial environment.
The SM1280x and TMx6x, when properly installed, comply
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 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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SM 1280
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 E 3327 (Toshiba), 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 basic 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 TMx6x.
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 6 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Modbus/TCPorProbusorProNET,etc.,
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. 50-51) 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.
Thevers.51hasthesamecongurationwiththeeldbus
connector.
- “Legacy SM1180” version (vers. 22) is a full replacement
for installation that uses the former SM1180, except minor
changes. See relevant chapter.
-Seethenalchapater“Howtoorder”formoredetailsand
p/n.
SM1280 Range Overview
MODELABBREV. BASIC BUS DISPLAY AUX-IN Legacy
SM1180
Version no. 0 1 2 50 51 22
External Control (PLC) possible    
LED Panel Indicators   n.a. 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. n.a.
RS 232 Control n.a.   n.a. 
Separate Input for Aux Voltages n.a. n.a. n.a.   n.a.
Firmware Upgrade      
*: Version 20 & 32 are not described in this manual. See past revision 5.

File: SM1280_r7eng -April 2017 - Technical note: SM1280 page 5 of 27
SM 1280
SM 1280
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
PERSONNELONLY.
MAY PRESENT RISK OF
ELECTRICAL SHOCK INSIDE!
ACHTUNG!
NUR FACHKRAFTE DIEWARTUNG
MACHEN MUSSEN
MANSICHEINEN SCHLOG HOLEN!
ATTENZIONE!
LA MANUTENZIONE DEVE ESSERE
FATTADA PERSONALE QUALIFICATO.
RISCHIODI SCARICHE ELETTRICHE
ALL’INTERNO!
COLLEGAREALLATERRA
DEL GENERATORE REMOTO
VERBINDER DIRECT MIT DER
ERDUNG DES MIKROWELLEN GENERATOR
CONNECT DIRECTLYTO 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
75 11
9
CURRENT
DATES/N
POWER
INPUT FREQ.
REGGIOE.-ITALY
MODEL P/N
ar
e
t
l
KVA
V
A
Hz
10
REAR PANEL versions 0 - 2
WARNING!
REFER SERVICE TO QUALIFIED
PERSONNELONLY.
MAY PRESENT RISK OF
ELECTRICAL SHOCK INSIDE!
ACHTUNG!
NUR FACHKRAFTE DIEWARTUNG
MACHEN MUSSEN
MANSICHEINEN SCHLOG HOLEN!
ATTENZIONE!
LA MANUTENZIONE DEVE ESSERE
FATTADA PERSONALE QUALIFICATO.
RISCHIODI SCARICHE ELETTRICHE
ALL’INTERNO!
COLLEGAREALLATERRA
DEL GENERATORE REMOTO
VERBINDER DIRECT MIT DER
ERDUNG DES MIKROWELLEN GENERATOR
CONNECT DIRECTLYTO 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
75 11
CURRENT
DATES/N
POWER
INPUT FREQ.
REGGIOE.-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

page 6 of 27 File: SM1280_r7eng -April 2017 - Technical note: SM1280
SM 1280
Description of versions 2 - 22
The front panel of the “Display version” (vers. 2), as well as
that of version 22 (Legacy version) includes a graphic display
and manual commands.
The unit can be driven manually through local commands (all
these versions), alternatively via remote I/O discrete channels,
via RS 232 serial port with our standard “FrontPanel” software
FRONT PANEL version 2 - 22
REAR PANEL version 22
The version 22 (called “Legacy SM1180) is a direct repla-
cement for SM1180 in versions 2, 3, 4, 5 : there is just one
wiring change, linked to the HV output [3], because the
SM1180 had a 4 pole LH type connector and the SM1280 uses
the single pole GES type HV connector.
The back panel of vers 22 (see below) has the same connetor
style, size and pin-out like the SM1180
Plsrefertothespecicschematicofversion22forwiringat
page 16 and following
Fuses specications
(all versions)
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: 3,15A
- Rated voltage: 250 V

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SM 1280
SM 1280
SM 1280 Ratings & Specications
Description Units Value Function Note
SM1280T: Line input nominal:
Working voltage range
Max Absolute voltage:
Input Current, max:
Vac
Vac
Vac
Arms
3x400
360÷440
450
18.5
Power input, 3 phase + GND
@400V input, full power
CONN #1, pin 2-3-7
See wiring schematic
SM1280D: Line input nominal:
Working voltage range
Max Absolute voltage:
Input Current, max:
Vac
Vac
Vac
Arms
3x208
185÷230
300
30
Power input, 3 phase + GND
@208V input, full power
CONN #1, pin 1-4-6
See wiring schematic
SM1280U: Line input nominal:
Working voltage range
Max Absolute voltage:
Input Current, max:
Vac
Vac
Vac
Arms
3x480
390÷570
600
14.5
Power input, 3 phase + GND
@480V input, full power
CONN #1, pin 2-3-7
See wiring schematic
Transient Overvoltage Cat. II According IEC 664
Output power, max Wdc 8500 Electrical power to magnetron input
Electrical efciency (Out/In) 92% Max heat to dissipate ~ 700 W
Output current range: mA 120÷1200 Adjustable range 10÷100%
Output current max: mA 1200 Limit in Power Control Mode With max amb temp. 40°C
Output voltage, max: Vdc 7800 Characteristic of magnetron Range 7.4÷7.8 kV
Output ripple, max ±4.5%@ 300 Hz
±3% @ 40 kHz Ripple in current at max power
Output linearity: Wdc ±15 Corresponding to ~ 10 Wrf
Output stability: 1% For input uctuations within ±10%
Filament pre-heating time sec 15 Preheat lament at Power
ON or after Hibernate is OFF When done, READY signal is ON
Magnetron power:
[Frequency]
kW
MHz 6 [2450 ]
Typical: YJ1600, H3881,
PM60, AM3881, E Selectable lament backdown curve for the specic tube
Enabling signal, digital input: Vdc +24
Range 5÷30 ON/OFF output & alarm reset Input Z: 4k7 kOhm CONN #2, pin 4. To reset alarm hold OFF for 2 seconds
Response time to full power: msec 80 Linear time Using Enabling signal
Response time to switch OFF: msec 20 Using Enabling signal
Pulsability of output, min TON msec 100 Max power 6 kW, Freq= 5 Hz Using Enabling signal
Switch OFF time for alarm msec 3 Automatic shut-off
Reference signal, analog input: Vdc 1÷10 Power control 10÷100% CONN #6, pin 5. Ground pin 18.
Input Z=50 kOhm, optoinsulated
Alarm contact, general:
Contact rating: max voltage
max current: V mA 30 500
OPEN: Alarm state or power
OFF
CLOSED: OK
CONN #6, pin 1-14
Alarm code, 4 bit contacts (0/1)
Contact rating: max voltage
max current V mA 30 100
Inform type of alarm with
emission of 4 bit code
See relevant table
CONN #6, pin 8-21-9-22 (bit 0...3)
Common pin 13
Ready contact:
Contact rating: max voltage
max current V mA 30 500
CLOSED when lament is
pre-heated & ready
OPEN not ready lament or
Alarm state
CONN #6, pin 12-24
Hibernate signal, digital input: Vdc +24
Range 5÷30 ON lament is hibernate. OFF or not used:lament heated
CONN #6, pin 11
Z= 4k7 kOhm
Interlock contact: OPEN: Alarm, shut OFF
outputs. CLOSED: OK CONN #6, pin 10-23
Monitor signals, analog outputs (2): Vdc 0÷10 Monitors various parameters
Max current: 10 mA
See relevant schematic
CONN #6, pin 2-15 (1); pin 3-16 (2)
Designed for receiver impedance
>30 kOhm (for accuracy <1%)
Voltage output (internal generator) Vdc +24÷30 Auxiliary voltage genera-
tor, unregulated, for user
interface
CONN #6, pin 10, 20. Max current:
100 mA

page 8 of 27 File: SM1280_r7eng -April 2017 - Technical note: SM1280
SM 1280
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
characteristics;
- 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
characteristics
- install the fuseholder cap: push it then rotate.
- reassemble the unit cover, screwing the 6 screws on sides
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.
Environmental & Physical Characteristics:
Use: Indoor use only, within industrial
enclosure
Working temperature range 5÷40°C [41÷104°F], Min-Max
ambient temperature
Altitude design criteria: for altitude up to 2.000 m
Working Humidity range 80% RH up to 31°C [88°F],
decreasing linearly to 50% RH
at 40°C [104°F]
Air cooling requirement, ow: m3/h 200 Input from front panel.
Air clean from dust
Pollution degree: 2, complies with IEC 664
Total Weigth: kg 35 [77 lbs).
Rack Dimensions, Panel Width:
Panel Heigth:
Length (Depth):
mm 480 [19”]
mm 310 [12.2 “ - 7HE/U]
mm 482 [19” ]

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SM 1280
SM 1280
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 front panel.
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
application. 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
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.

page 10 of 27 File: SM1280_r7eng -April 2017 - Technical note: SM1280
SM 1280
Equipment operation
when working with versions allowing
External Control (vers 0 - 2 - 22 - 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.
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 the “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:
 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.
 it’s a waiting state, the unit is powered but not
readyasthemagnetronlamentisnotpowered;allthewor-
king 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.
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
 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.
 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.
 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:

File: SM1280_r7eng -April 2017 - Technical note: SM1280 page 11 of 27
SM 1280
SM 1280
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
Working Modes
(vers 2 - 22 only)
The “Display” versions have a graphic display, can be driven
manually via the front panel controls.
The status of the equipment and all the relevant information
to the user are provided through the graphic display: the
following layout describes the various pages, showed on the
display, and their logical link:
At power ON the
display shows ini-
tially 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 magnetron 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.

page 12 of 27 File: SM1280_r7eng -April 2017 - Technical note: SM1280
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
submenu: it allows to enter the
estimated value of magnetron
efciency,range:0-100%.If
you select 100% the “Microwave
Power” corresponds to the electri-
cal output power of the psu.
When the unit is in Alarm state
the cause is displayed until the
alarm is removed.
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).
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.
Meaning of external commands.
(vers 0 - 2 - 20 - 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 related
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 gene-
rate 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-
rate any output power, when >1Vdc the unit generates power
proportional to this signal value.

File: SM1280_r7eng -April 2017 - Technical note: SM1280 page 13 of 27
SM 1280
SM 1280
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.
WARNING: dangerous voltages are present inside the unit,
only trained personal can modify internal settings.
Always switch-off the unit before opening any panel, and
leave at least one minute
DIP-SWITCH #1 (on board M416.x): allows to override some
external alarms, as follow
SW1-1if set to ON disables ARC DETECTOR alarm.
SW1-2if set to ON disables MAGNETRON THERMAL alarm
SW1-3if set to ON disables AIR FLOW alarm
SW1-4if set to ON disables H2O FLOW alarm
SW1-5if set to ON disables INTERLOCK input
SW1-6if set to ON disables MICRO CARTER alarm
SW1-7if set to ON inhibits the automatic opening of the
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 power to the head
and leaving the head in a safe condition.
SW1-8– not used.
SW2
NORMAL OP.
HARDWARE
FIXED
TEST
FIELDBUS
PM60
H3881
ON OFF
ON OFF ON OFF ON OFF
YJ1600
ON OFF
id26042234 pdfMachine by Broadgun Software - a great PDF writer! - a great PDF creator! - http://www.pdfmachine.com http://www.broadgun.com
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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DIP-SWITCH #2 (on board M416.x)
Switches 1and 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
/ E 3327 Toshiba
0 1 H3881 Hitachi
1 0 PM60 Panasonic
1 1 Filament xed @5V
SW2-3if set to OFF enables the external control of the unit, set
toONenablestheeldbuscontrol.

or if no communication is present on the bus, an alarm is
generated.
SW2-4must 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.
(DIP-SWITCH #1)

page 14 of 27 File: SM1280_r7eng -April 2017 - Technical note: SM1280
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:
AN 10.290: Modbus/TCP Protocol for SM1280
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 next 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
PERSONNELONLY.
MAY PRESENT RISK OF
ELECTRICAL SHOCK INSIDE!
ACHTUNG!
NUR FACHKRAFTE DIEWARTUNG
MACHEN MUSSEN
MANSICHEINEN SCHLOG HOLEN!
ATTENZIONE!
LA MANUTENZIONE DEVE ESSERE
FATTADA PERSONALE QUALIFICATO.
RISCHIODI SCARICHE ELETTRICHE
ALL’INTERNO!
COLLEGAREALLA TERRA
DEL GENERATORE REMOTO
VERBINDER DIRECT MIT DER
ERDUNG DES MIKROWELLEN GENERATOR
CONNECT DIRECTLYTO 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
75 11
CURRENT
DATES/N
POWER
INPUT FREQ.
REGGIOE.-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
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

File: SM1280_r7eng -April 2017 - Technical note: SM1280 page 15 of 27
SM 1280
SM 1280
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 based o.s. and an easy graphic interface to verify, change,
enable the discrete I/O of the power supply.

page 16 of 27 File: SM1280_r7eng -April 2017 - Technical note: SM1280
SM 1280
Connector # 1 wiring (vers. 0 - 1 - 2 - 22)

File: SM1280_r7eng -April 2017 - Technical note: SM1280 page 17 of 27
SM 1280
SM 1280
Connector # 1 wiring (vers. 50 - 51)

page 18 of 27 File: SM1280_r7eng -April 2017 - Technical note: SM1280
SM 1280
Connector # 3,4,5 wiring (all versions except 22)
14 1312
11
7
3
8 4
1
2
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