ALTER SM1050D Specification sheet

SM 1050
SWITCHING POWER GENERATOR
FOR 3 KW MAGNETRON
SM 1050D: for main line 3 x 208V
SM1050T: for main line 3 x 400V
TECHNICAL NOTE

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SM 1050 Switch-mode power supplies for 3 kW magnetron
Dichiarazione CE di Conformità
CE Declaration of Conformity
Nome del costruttore: ALTER s.r.l
Manufacturers Name:
Indirizzo del costruttore: Via Chiloni, 25 - 42100 Reggio Emilia - Italy
Manufacturers Address:
Dichiara che il prodotto:
Declare that the product:
nome del prodotto: Alimentatore elettrico SM1050
modello: SM1050D SM1050T
model:
al quale questa dichiarazione si riferisce è conforme alle seguenti norme:
complies with the following norms:
EN 61010-1: 1994 + A2: 1996 (EN 61010: 1993 + A2: 1995)
EN55011: 1991
I prodotti sopra descritti sono conformi ai requisiti della Direttiva di Bassa Tensione 73/23 CEE.
The products listed above comply with the requirements of the Low Voltage Directive 73/23/
EEC.
Reggio Emilia, Febbraio 1999
Marco Garuti
Presidente C.A.

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SM 1050 Switch-mode power supplies for 3 kW magnetron
Contents:
- General informations .............................................................................. page 4
- Warnings .............................................................................................. page 4
- General description ................................................................................. page 5
- Equipment ratings ................................................................................... page 5
Environmental conditions .................................................. page 5
Fuses .................................................................................... page 6
Physical characteristics....................................................... page 6
- Equipment installation ............................................................................ page 7
Handling instructions.......................................................... page 8
Wiring instructions ............................................................. page 8
- Equipment operation ............................................................................... page 9
Operating controls............................................................... page 9
LED meaning....................................................................... page 9
Alarm information .............................................................. page 10
Alarm table ......................................................................... page 11
- Equipment maintenance.......................................................................... page 12
Cleaning instructions .......................................................... page 12
Fuses replacement ............................................................... page 12
- Layout of internal components ............................................................... page 13
- Dip-switch settings on power board ...................................................... page 13
- Components list ....................................................................................... page 14
- Wiring diagram and specs for connectors #1,3,4 of SM1050D .......... page 15
- Wiring diagram and specs for connectors #1,3,4 of SM1050T .......... page 16
- Wiring diagram and specifications for connector #5 .......................... page 17
- Wiring diagram and specifications for connector #2 .......................... page 18
- Block diagram of SM1050 unit .............................................................. page 19
- Accessories .............................................................................................. page 20
Filament transformer .......................................................... page 20
WG10253 Remotable microwave head (open frame) ...... page 20
TM 030 Remotable microwave head (closed cabinet) ..... page 21,22
Wiring example SM1050 vs TM030 remote head .............. page 23
Wiring example SM1050 vs WG10253 remote head ......... page 24
- How to order ............................................................................................ page 25
- Technical assistance ................................................................................ page 25

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SM 1050 Switch-mode power supplies for 3 kW magnetron
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 qualified 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 classified as industrial, scientific
and medical (ISM) radio-frequency equipments and the related standard for the
emission is the EN55011 (=CEI110-6) (title: Limits and methods of measurement of
radio disturbance characteristics of ISM equipment.)
With reference to 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 SM1050 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 certificate of the user's final equipment.
WARNINGS
The SM1050 is powered by AC main line and has high voltage output: 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 responsible for checking and using the equipment, as well as the risk
of general malfunctions of the equipment itself.

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SM 1050 Switch-mode power supplies for 3 kW magnetron
General Description
The SM 1050 power supply is able to supply, from remote location, the current necessary for a 3 kW magnetron,
asthe NL10230 orequivalent,observing the specificationssetby the electrontubemanufacturer. This constructional
choice-separationbetween thepower supplyunit andthe microwave head- allowsgreat freedomin positioning,even
at long distance, the microwave emitter head, thus simplifing installation and maintenance.
In this manual the term "SM1050" refers both the models (SM1050D and SM1050T).
Inadditionto poweringmagnetron, SM1050generator alsosupplies power tomagnetron coolingfan (when needed),
it monitors magnetron temperature, carries out a number of monitoring processes independently, cuts off the power
in case of malfunction and display the alarms by mean of LED as explained hereinafter.
The output power can be adjusted from the outside on a continuous scale using the front panel potentiometer or an
external analog signal: various options are available.
Equipment ratings
SM 1050D SM 1050T
Input voltage (nominal): 3 x 208 Vac 3 x 400 Vac
Absolute max input voltage: 255 Vac 440 Vac
Absolute min. input voltage: 180 Vac 360 Vac
Line frequency: 50/60 Hz 50/60 Hz
Transient overvoltage: overvoltage category II according IEC664
Intake current: 20 A/phase max 12 A/phase max
Output power: 5000 W 5000 W
Output current (@40°C/104°F) 950 mA @ 5300 V 950 mA@ 5300 V
Output ripple: <2% under any condition <2%under any condition
Suggested magnetron type: NL10230 NL10230
Filament preheating delay: 10 sec 10 sec
Suggested filament transformer type: FIL100S FIL100S
Remote control (enabling): 24 Vdc nominal, range 8-30 Vdc, common to ground
Measuring output current signal: 1V=200 mA (Z=250 ohm) 1V=200 mA (Z=250 ohm)
Internal alarm contact (for both models): Max 130 V 0,5 A. Operation modes:
a) power supply OFF: open contact
b) power supply ON, ok status: closed contact
c) power supply ON, alarm condition(s): open contact.
Delay between applied reference signal
vs output power (for standard models): 40 msec increasing, 10 msec decreasing
Environmental conditions for all models
Use: Indoor use only
Altitude: up to 2,000 m (approx 6,000 feet)
Temperature: 5°C to 40°C (41°F to 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, according IEC664

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SM 1050 Switch-mode power supplies for 3 kW magnetron
Fuses
The equipment is provided with fuses installed on the rear panel: 2 auxiliary fuses (see drw page 10, pos. 5)
SM 1050D SM 1050T
Auxiliary fuses (page 10, pos. 5):
Dimension, type: 6.3x32 mm, ceramic, 6.3x32 mm, ceramic
Rupturing speed: quick acting (F) quick acting (F)
Rated current: 5 A 5A
Rated voltage: 250 V 250 V
Physical characteristics
Total lenght (without handles): 475mm
Front panel size (w x h) 483 mm (19")x 133 mm (3HE)
Equipment width: 445 mm
Equipment height: 120 mm
Depth of a standard board to install SMx45: 800 mm (suggested)
Total weight: 19 kg (42 lbs)

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SM 1050 Switch-mode power supplies for 3 kW magnetron
Equipment installation
The SM1050 cannot operate on a bench: it
must be installed into a proper cabinet like a
commercial 19" standard enclosure.
The equipment cannot operate cantilevered, it
must be safely fixed 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.
Usually two "L" shaped supports on each side
of the equipment are suitable for that purpose.
Look at the following drawings as suggestion
for installation inside a cabinet.
The rear side of the equipment must be
protected by a fixed 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 at least

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SM 1050 Switch-mode power supplies for 3 kW magnetron
the enabling signal of the equipment or the main line. This safety precautions must be taken to avoid operations
on rear fuses or on the connectors while the unit is still powered.
Special attention must be taken on designing the cooling air flow in case of stacking several units into the same
cabinet.
Note that each equipment has its own fans on the rear side which intake approx 400 m3/h: the outlets of the
exhaust air are on both sides of the equipment.
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 minimum depth of 800 mm (32");
2. allow free intake of the cooling air from the rear of the cabinet;
3. in case of ambient air with high degree of dust and moisture, install proper filters and instruct for their
maintenance;
4. provide a separation between the air intake duct and the air outlets, in order to avoid air-recyrculating;
5. when the air flow exits from the sides of the equipment cannot be exhausted directly into ambient, then you
must provide a suitable fan to remove it. Consider a flow rate of 400 m3/h for each power supply.
Handling instructions
The equipment weight is 19 kg (42 lbs): lift it from the bottom. Do not use the handles for lifting. The handles
have been designed to facilitate insertion and removal of the equipment from a cabinet ( horizontal movement
only).
Wiring instructions
The SM1050 must be installed and serviced only by qualified 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 14);
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 three phase main supply, type phase/phase/phase, must be provided through connector #1:
SM1050T: connect phases to pin 1,2,3, ground to pin 4; SM1050T: connect phases to pin 5,6,7,
ground to pin 4: the connector's pins can house wires with gauge up to 2.5 mm2; the wires lenght
shall be according to current capability of the wires section;
IV) the connector #2 brings the input/output signals to the microwave head. Refer to wiring diagram
at page 17;
V) the connector #3 is the high voltage output and must be connected to magnetron's cathode.
The voltage value is close to 5.3 kV (depends from the magnetron characteristics).
Use a proper insulated cable with working voltage >6 kVdc and minimum gauge of 0.25 mm2;
The connector #4 provides the power supply for the filament transformer (located near the magnetron),
the megnetron fan and the head lamp.
VI) the user must provide external circuit breaker .
VII) this external protection devices must allow to switch-off the main line for maintenance
operations;
VIII) the external circuit breaker must be a 3 poles breaker and must comply the norm
EN61010-1;
IX) the external circuit breaker must be in close proximity to the SM1050 and within easy reach of the
operator;
X) the external circuit breaker must be marked as the disconnecting device for the SM1050;
XI) the connector #1 must never be used as a switch-off device.

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SM 1050 Switch-mode power supplies for 3 kW magnetron
Equipment operation
Operating controls
The SM1050 operation is controlled by an external command at +24 Vdc (nominal): the voltage range may
vary from 8 to 30 Vdc, common to ground, Z=2.5 kOhm. The command signal must be wired to pin 3 of the
connector #5: if the user doesn't have a suitable voltage generator for this signal, then the equipment's internal
voltage generator can be used: a voltage signal is available at pin 4 of connector #5. In this case the user must
provide an external contact closing the circuit between pin 4 and pin 3 to enable the equipment operation. Refer
to wiring diagram at page 16.
When the main braker, installed on the front panel, is ON and the followings condition are satisfied:
-the SM1050 has been properly connected to a remote microwave head
- there are not alarms conditions
- the filament preheating has been completed
- the external command is ON, then
the SM1050 reach the preset value of anodic current and power-up the remote microwave head.
On the front panel there are the following devices (the number in brackets [ ] refers to items of the drawing "Front
Panel"):
- a 3 poles ON/OFF circuit braker -[1]
- a single turn or multiturn potentiometer (a rotating knob) to adjust the output current - [2]
- a yellow, 12 spot, bar LED displaying the output current - [3]
- an "ON" status green LED - [4]
- 5 alarms status red LEDs - [5]
- an enabling status green LED - [6]
LED meaning:
ON (green): ON when the circuit braker is ON
RACK ALARM (red): OFF when no alarm is present.
ON for: a) internal overtemperature. When the temperature is

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returned to normal level the alarm is cancelled;
b) a comparision error has been detected between
output current level vs reference signal: in this case the
equipment tries to restart every second.
c) overcurrent. It's a permanent alarm: to reset switch-off or
disable the equipment at least 3 seconds.
Important note about alarms: any alarm condition, whether temporary or permanent, causes
block of the equipment, which means no output power. Pls refer to next chapter "Alarms
informations" for more explanations.
TUBE OVERTEMP.(red): OFF for no overtemperature alarms.
ON for magnetron overtemperature (or when the related connection
is not grounded). It is designed to work with a thermoswitch
normally closed to ground.
This is a temporary alarm: when the magnetron temperature comes
back to normal, then the alarm is cancelled without user's intervention:
the equipment restarts and reaches the presetted anode current level.
ARC DETECTION (red): OFF for no arc detection into the waveguide.
ON when an arc is detected (or when the related input connection is
not grounded): it is designed to work with an arc detector normally
closed to ground. If the arc detector is not installed then connect
the related input pin to ground (refer to wiring diagram at page 15)
This is a temporary alarm: after 1 second from the stop, the equipment
cancels the alarm and restart without user's intervention.
OVERVOLT (red): OFF: no alarm
ON: anodic overvoltage > 5kV for period longer than 500 msec.
This is a permanent alarm: to reset the alarm condition user must
switch-off or disable the equipment at least 3 seconds.
LEAKAGE (red): OFF: no alarm
ON: current leakage detected by high voltage dropping under 2 kV
for period longer than 1 msec.
This is a permanent alarm: to reset the alarm condition the user must
switch-off or disable the equipment for at least 3 seconds
ENABLE (green): OFF: output power is OFF.
ON: enabling signal is present: the equipment produces output power at
the level set by reference signal.
Alarm information:
There are two types of alarms: temporary and permanent.
Any alarm condition, whether temporary or permanent, causes the block of the equipment, which means no
output power.
Temporary alarms are not severe and/or simple to understand and remove (i.e. overtemperature of the
magnetron): are called "temporary" because the alarm condition is not stored and when the cause of the alarm
is removed -and the enabling signal is still present- then the equipment restarts and reaches the preset power
level.
The permanent alarms are severe alarms which may indicate failure of the equipment and/or a danger
situation (i.e. current leakage): the alarm condition is stored and the equipment needs a reset procedure to
start again.