ALTER GM 140 User manual

GM 140
SWITCHING POWER GENERATOR
WITH PULSED OUTPUT CAPABILITY
FOR 0.9 KW MAGNETRON
(1.5 KW PEAK POWER)
TECHNICAL NOTE
(Issue October 2003)

GM 140
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CE Declaration of Conformity
Dichiarazione di Conformità CE
Manufacturer’s Name: ALTER s.r.l
Nome del Costruttore:
Manufacturer’s Address: Via Curie, 8 - 42100 Reggio Emilia - Italy
Indirizzo del Costruttore:
Declare that the microwave generator:
Dichiara che il Prodotto:
product name: GM140
nome del prodotto GM140
model: GM140T
modello GM140T
Complies with the following norms:
Soddisfa le seguenti norme:
EN 61010-1: 1994 + A2: 1996 (EN 61010: 1993 + A2: 1995)
EN55011: 1991
The products listed above comply with the requirements of the Low Voltage Directive 73/23/EEC.
I Prodotti sopraindicati sono conformi con la Direttiva di Bassa Tensione 73/23/EEC
Reggio Emilia, June 2003.
Marco Garuti
Presidente C.d.A.
Rev. Note di revisione Data File
0 Prima emissione Ottobre 2003 GM140_r0eng
1
2
3

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Contents
A
Alarms 12
C
CE Declaration 1
Cleaning 7
Components Layout 8
Components List 8
E
Environmental conditions 4
Equipment installation 4
Equipment Ratings 3
F
Fuses replacement 7
Fuses specications 4
G
General Description 3
General Information 2
H
Handling instructions 4
How to order 12
O
Outside dimensions 9
P
Physical characteristics 4
Pin out of CONN. # 1,2, 3 con segnale esterno 10
Pin out of CONN. # 1,2, 3 con segnale interno 11
T
Technical Assistance 12
W
Warnings 2
Wiring instructions 4
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 clas-
sied as industrial, scientic 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 characteri-
stics 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 GM140, 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 GM140 is a microwave generator with
output power of 0.3 kW @ 2.45 GHz.
People must not be exposed to the microwave
energy which may be given off by the magne-
tron or other microwave generator devices in
case of incorrect use or connections.
All microwave input and output connections,
waveguides, anges, and couplings must be
made safe.

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Never operate the generator without a load to
absorb the microwave energy.
Read carefully this manual before using.
Failure to comply with the instructions enclo-
sed in this manual may involve considerable
risks for the staff responsible for checking and
using the equipment, as well as the risk of ge-
neral malfunctions of the equipment itself.
General Description
The GM 140 may operate as a continuous or pulsed power
generator for the 2M226 magnetron or equivalent.
As a continuous source the unit may adjust the magnetron’s
power over the entire range from 30Wrf up to 300W rf,
while in pulsed mode the GM 140 may drive the magnetron
to reach peak power up to 1.5kWrf, with a duty factor of
20% max, corresponding to an average power of 300Wrf.
FRONT PANEL
The front panel comprises the following: (see drw):
- the equipment label [1]
- 4 leds: READY, HIGH VOLTAGE ON,
MICROWAVE ON, ALARM [2];
- a 7 pins socket for main supply (CONN. #1) [3];
- 2 rotary switches to set frequency range (FREQ) and
pulse lenght (t on) [4];
- a 9 pins “D” type socket for reference input (CONN. #2)
[5];
- a 25 pins “D” type socket for the signals (CONN. #3) [6]
The intake air ow is approx. 80 m³/h.
Equipment ratings
Input voltage and frequency: 400V +/- 10%, 50/60 Hz
Transient overvoltage: overvoltage category II
according IEC664
Intake power (typ.): 500 VA
RF output power (nominal): 300 W 2.45 GHz cw or
1500 W peak
Mean line current (typ.): 1.8 A at 400Vac
Mean anodic current (typ.): 110 mA
Peak anodic current (typ.): 550 mA
Remote control: 0÷10 Vdc
Logic controls: 0V off - 8÷24V on

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Environmental conditions
Use: Indoor use only
Altitude: Tested up to 2,000 m
Temperature: 5°C to 30°C
Relative Humidity: 80% for temperature up 31°C,
linearly decreasing to 50%
RH at 40°C
Pollution degree: 2 according IEC664
Fuses
The equipment is provided with 4 fuses on the interface
board (inside the generator) installed on the front panel.
IO board fuse
Dimension, type: 6x32 mm, ceramic,
Rupturing speed: Time - F
Rated current: F1, F2 and F3: 5 A
F4: 500 mA
Rated voltage: 500 V
Physical characteristics
Total lenght: 610 mm
Total width: 200 mm
Cabinet width: 160 mm
Cabinet height: 180 mm
Total weight: 12 kg (26 lbs)
Equipment installation
The GM140 cannot operate stand alone: it must be coupled
to a proper cavity by the R26 ange.
The equipment cannot operate cantilevered, it must be sa-
fely xed vertically. If used horizzontally you must provide
a suitable support.
Handling instructions
During handling use always protection gloves. The equip-
ment doesn't have lifting eyebolts and its weight is 12 kg
(26 lbs): always lift the equipment using only the bottom of
the cabinet with a proper lifting apparatus.
Do not add any eyebolt to the cover or the front panels: they
are not suitable for lifting operations.
Wiring instructions
The GM140 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 by the connector
CONN#1 using the pin n° 4 (see the wiring drawings at
page 10 and 11);
II) the three phase main supply, type phase/phase/phase/
must be provided by connector CONN#1: phase connection
to pin 1,2 and 3, ground to pin 4;
III) the connector's pins can house wires up to 2.5 mm2; the
wires lenght shall be according to current capability of the
wires section;
IV) the user must provide external circuit breaker and ther-
mal cut-off. These devices must protect the GM140 from
short-circuit and thermal runaway;
V) these external protection devices must allow to switch-
off the main line for maintenance operations;
VI) the external circuit breaker must be a three poles
breaker and comply the norm EN61010-1;
VII) the external circuit breaker must be in close proximity
to the GM140 and within easy reach of the operator;
VIII) the external circuit breaker must be marked as the
disconnecting device for the GM140;
IX) the connector CONN#1 must never be used as a switch-
off device.
X) the signals must be provided by CONN#3 with 25 poles
at cable (according to wiring diagram at page 10 and 11).
XI) the reference signal to adjust power must by provided
by CONN#2 with a 9 poles at cable (according to wiring
diagram at page 10 and 11).
Operating Controls
The GM140 is driven through electrical signals at
connectors.
CONN#1
Power supply
CONN#2
Pin 1-2 SET VALUE FOR MW POWER reference signal
for microwave power (SetPoint).
0÷10Vdc / 0÷100% Power. No power is emitted unless you
reach a reference signal of 1Vdc (10% power).
CONN#3
Controls. Optoinsulated signals.

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Pin Name I/O Description Logic
1 POWER STAGE ON In Enables power section High level enables
2 HIGH VOLTAGE ON In Enables high voltage section High level enables
3 MICROWAVE ON In Enables microwaves emission High level enables
4 RESET In Reset after an alarm occurrence. High level enables *
5 CW/PULSE MODE In Continuous/pulsed mode selection High level selects pulsed mode
6 OVER DUTY Out Alarm High level means alarm
7, 8,
9, 10 In Pulse pattern for pulsed mode, see forward.
11 Common 24Vdc
12 +24 V - ISOL mirror for pin15
13 GROUND
14 GROUND
15 +24 V - ISOL In External Insulated 24 Vdc
16 MICROWAVE IS
ACTIVATED Out mirror for pin3
17 HIGH VOLTAGE IS
ACTIVATED Out mirror for pin2
18 unused
19 MW MODULE IS
READY Out Raises 5 seconds after power on: once pre-heating is complete.
20,
21 In Pulse pattern for pulsed mode, see forward.
22 FAILURE COOLING
MAGNETRON Out Alarm High level means alarm
23,
24 ALARM CONTACT Out Alarm contact Open in case of alarm (or switch off)
25 VALUE LESS THEN
SET VALUE Out Warning High level means warning
POWER SECTION
HV SECTION
GM 140
POWER STAGE ON
HIGH VOLTAGE ON MICROWAVE ON
HIGH VOLTAGE
FILAMENT MW
ALARM
* After removing alarms cause set high for 1 sec. the reset signal to clear the alarm; a high value in this
signal inhibits the latching of fhurter alarms.

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0
1
3
4
5
6
7
8
9
2
0
1
2
3
4
5
6
7
8
9
ton
FREQ
0
2
3
4
5
6
7
8
9
1
0
1
2
3
4
5
6
7
8
9
ton
FREQ
0
1
2
3
4
5
6
7
8
9
0
2
3
4
5
6
7
8
9
1
ton
FREQ
0
1
2
3
4
5
6
7
8
9
0
1
3
4
5
6
7
8
9
2
ton
FREQ
0
1
2
3
4
5
6
7
8
9
0
1
2
3
5
6
7
8
9
4
ton
FREQ
Microwaves emission mode selection
You can select two different modes of microwaves
emission: continuous or pulsed mode.
In pulsed mode you can drive pulses by:
- an external signal generator or
- FREQ and ton switches on front panel added with two
analog signals (internal generator).
Continuous:
Pin 5 CONN#3 CW/PULSE MODE OFF
Pulsed, with external generator
Pin 5 CONN#3 CW/PULSE MODE ON
Pin 9-10 CONN#3 PULSE PATTERN
PWM: Amplitude 24 Vdc
ton=0.1÷10ms
toff=1÷100ms
Max Duty Cycle=20%
(with hysteresis)
Pulsed, with internal generator
Pin 5 CONN#3 CW/PULSE MODE ON
Pin 9-21 CONN#3 Pins connected (shortcircuited)
Pin 7-8 CONN#3 SET VALUE FOR FREQUENCY
See table below
0÷10Vdc / 9÷310Hz Select FREQ=2
0÷10Vdc / 230÷4500Hz Select FREQ=1
Pin 20-8 CONN#3 SET VALUE FOR ton
See table below
0÷10Vdc / 60÷300µSSelect ton=1
0÷10Vdc / 220µS÷1.6mS Select ton=2
0÷10Vdc / 1.2÷9.5mS Select ton=4
Frequency selection: 0÷10Vdc PIN 7, 8
Frequency: 9Hz÷310Hz
Frequency: 230Hz÷4500Hz
Different selection not allowed
Time selection: 0÷10Vdc PIN 20, 8
Time: 60µs÷300µs
Time: 220µs÷1,6ms
Time: 1,2ms÷9,5ms
Different selection not allowed

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Equipment maintenance
Cleaning
Once a week inspect the inlet air lter as well as the outlet
window.
The inlet lter, on the cover, may be taken off by means of
a screwdriver or similar tool doing raise between the lter
and the cover: before doing any operation switch off the
external circuit breaker provided to remove the main from
the equipment.
In case the equipment needs to be cleaned then proceed as
follow:
- switch off the external circuit breaker or whatever device
provided to remove main from the equipment;
- remove the main connector CONN#1 by rotating counter-
clockwise the external ring then pull it;
- remove cover
- remove dust with dry air
- reinstall cover: tighten all the screws
- plug the connector CONN#1: push the plug into the socket,
rotate clockwise the ring
Fuses replacement
To replace the power board fuse proceed as follow:
- switch off the external circuit breaker or whatever device
provided to remove main from the equipment;
- remove the main connector CN1 by rotating counter-
clockwise the external ring then pull it;
- remove the cover;
- locate the interface board M284: see drawing next page
pos.9;
- locate the fuse on the interface board;
- replace the fuse with a new one with the same electrical
characteristics;
- install the cover;
- plug the connector CN1: push the plug into the socket,
- For the fuse value see page 4.
Operations sequence
- Select mode (continuous/pulsed)
- If pulsed, then select wether internal or external source and activate it.
- Set the RESET signal Off (Pin4 CONN#3)
- Set Off the signals: POWER STAGE ON (Pin1 CONN#3),
HIGH VOLTAGE ON (Pin2 CONN#3),
MICROWAVE ON (Pin3 CONN#3)
- Supply the GM through external device (main on CONN#1)
Wait for signal MW MODULE IS READY (Pin 19 CONN#3) to raise
The READY led turns on
- Set On the signal POWER STAGE ON (Pin1 CONN#3)
The signal POWER STAGE ON IS ACTIVATED (Pin17 CONN#3) goes on
- Set ON the signal HIGH VOLTAGE ON (Pin2 CONN#3)
The HIGH VOLTAGE ON led turns on
Wait at least 5 seconds
- Set ON the signal MICROWAVE ON (Pin3 CONN#3)
The MICROWAVE ON led turns on
The signal MICROWAVE IS ACTIVATED (Pin16 CONN#3) goes on
Now microwaves are generated in the selected mode
- Stop and start microwaves with the MICROWAVE ON (Pin3 CONN#3) signal.
- Select the power desired using the analog signal SET VALUE FOR MW POWER (Pin 1-2 CONN#2).
- At the end of job no special turn off sequence is needed to switch off the GM.

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Component Layout
Pos Q.ty Description P/N Note
1 2 Fan VE8412NGH
2 1 Magnetron MW2M226519F
3 1 H.V. board M283 800000283
4 2 H. V. Capacitor CR751A2K5
5
1 7 pins Socket, AMP/CPC MOCPC07/2061371 Conn.#1
1 7 pins Plug, AMP/CPC (*) MOCPC07/2061361
4 Male pin, size lll MOCPCX/0662614
4 Female pin, size lll (*) MOCPCX/0667402
6 1 Power board M282 800000282
7 1 Filament transformer 42ATT230/004
8 1 Main lter FL20AY01
9
1 Interface board M284 800000284
1 Connettore a vaschetta volante 25 pin (*) MODFL25M Conn.#2
1 Connettore a vaschetta volante 9 pin (*) MODFL09M Conn.#3
1 Calotta per connettore 25 pin (*) MOCAL25D/PERNI
1 Calotta per connettore 9 pin (*) MOCAL09D/PERNI
Note: Components marked with (*) are included on the
connector set p/n 44SETGM140 to be ordered separately
Component List

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Outside dimensions

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Pin out of CONN. # 1, 2, 3 with external pulse pattern generator
POWER STAGE ON IS ACTIVATED 24V

GM 140
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Pin out of CONN. # 1, 2, 3 with internal pulse pattern generator
POWER STAGE ON IS ACTIVATED 24V

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How to order
Power supplies: GM140y.xxxj, where:
y: T = 3 x 400
xxx: the code used for a customized
unit;
j (version code): nul or 0 = standard version
1 = version 1
Please specify at time of order the value of the reference
signal required: 0-10 V (standard)
Connector/plug set: p/n 44SET140
3 port isolator with dummy load: several models availa-
ble:ask for quote and type.
Cable set: p/n 44 1384 140 Includes
main line cables, signals cable.
Standard lenght is 3 mt; other
lengths available on request
Alter reserves the right to improve or modify this pro-
ducts, at any time, without any obligation to notify any
person or entity of such changes.
No part of this publication may be reproduced without
the express written consent of Alter.
All rights reserved.
Technical Assistance:
Alter s.r.l
42100 Reggio Emilia - ITALY
Tel: ++39 0522 553 820; fax ++39 0522 553 577
Web: www.altersystem.com
Alarms and warnings.
When the GM140 is turned on without alarms, the ALARM
CONTACT (Pin 23-24 CONN#3) contact is closed.
When the GM140 is switched off or an alarm is present, the
contact opens.
More, when an alarm occurs, the ALARM led turns on and
the GM140 stops microwaves.
To reset the GM140, clear the alarm and give a high value
to the RESET (Pin 4 CONN#3) signal (see page 5).
The UNDER VALUE warning is just a signal, not an alarm;
so it does not stop, neither open alarm contact. You don’t
need to reset it.
Type Name Description Coded on Pin
Alarm Voltage alarm Voltage> 5000 Volt No code
Short circuit Short circuit on magnetron No code
Driver Internal failure No code
Overcurrent Current>130mA average No code
Overduty Duty cycle>20% (with hysteresis) Pin 6 CONN#3
Failure Cooling MWG Too high temperature on magnetron Pin 22 CONN#3
Warning UNDER VALUE Current< (Set Point - 2%) Pin 6 CONN#3