SAES NEG Power mini User manual

UDOC – CONTROLLED COPY
M.HIST.0138.23 R1 October, 06 th 2020
SAES Getters S.p.A. – Italy
www.saesgroup.com
USER MANUAL
NEG POWER MINI
NEG Pump Controller

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The NEG POWER MINI - NEG Pump Controller power supply serves for operating the
NEG (Non Evaporable Getters) pumps. It is designed to be used indoor in laboratory
conditions.
Security provisions
Symbols on the Manual
These symbols appear on the product:
CAUTION
Pay specific attention
to the section
WARNING
After transportation, the device has to be left idle without mains
voltage for at least 3 hours at the ambient temperature.
WARNING
The use of the instrument for any other purpose than the one originally
intended may damage the instrument, injure the user and void all
warranties.
ATTENTION
High voltage is present inside the instrument and also in the
connectors and cables, which may harmful to the user.
Manipulation of the cables and of the grounding wire is
prohibited while the appliance is in operation.
Likewise, the operation of the instrument without its protective
covers is prohibited.
Protect the device against humidity and against penetration of
conductive objects and liquids into the ventilation slots.

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INDEX
1. APPLICATION ........................................................................................ 4
2. INTRODUCTION .................................................................................... 4
2.1. General description .......................................................................... 4
2.1. Main Features .................................................................................. 5
2.2. Electronic circuit features ................................................................. 5
2.3. Remote and multi Control ................................................................ 5
2.4. The front panel of the unit ................................................................ 6
2.5. The rear panel of the unit ................................................................. 6
2.6. NEG POWER MINI Dimensions and Weight .................................... 7
2.7. Supplied accessories ....................................................................... 7
3. INSTALLATION ...................................................................................... 8
3.1. Rack mounting ................................................................................. 8
3.2. Electrical connections ...................................................................... 8
3.3. Cleaning .......................................................................................... 8
4. USAGE ................................................................................................... 9
4.1. Initial setup ...................................................................................... 9
4.2. Setting Menu ................................................................................. 11
4.3. Maximum Allowed Pump Temperature .......................................... 12
4.4. Logging .......................................................................................... 12
5. ABNORMAL SITUATION AND ALARM NOTIFICATION ...................... 13
5.1. INTERLOCK Alarm ........................................................................ 13
5.2. PUMP OPEN Alarm ....................................................................... 14
5.3. OVER CURRENT Alarm ................................................................ 14
5.4. PUMP OVER TEMPERATURE Alarm ........................................... 14
5.5. VMON - UNDER VOLTAGE - OVER VOLTAGE ........................ 15
6. RECOMMENDED SETTINGS .............................................................. 16
6.1. Voltage level for the correct heating ............................................... 16
6.2. Slow Heating.................................................................................. 18
6.3. Heating without automatic stop ...................................................... 18
7. THE OUTPUT CONNECTOR FUNCTION ............................................ 19
7.1. Pin layout of DB9 IN/OUT Interface connector ............................... 19
8. ELECTRICAL SPECIFICATIONS ......................................................... 20
9. MAINTENANCE ................................................................................... 20
10. PRODUCT CONFIGURATIONS AND ACCESSORIES ........................ 21
10.1. NEG POWER MINI configurations and accessories: ................... 21
10.2. Pump cables and accessories: .................................................... 21
11. INSTRUCTION FOR INSTRUMENT DISPOSAL .................................. 22
12. WARRANTY CONDITIONS .................................................................. 23
13. SERVICE .............................................................................................. 24
13.1. Sales & Service Locations: ......................................................... 24
APPENDIX A: Supply cables ....................................................................... 25

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1. APPLICATION
NEG POWER MINI - NEG Pump Controller power supply is designed to operate the MK4 and MK5
NEG pump series, namely GP SORB AC®, CapaciTorr®, CapaciTorr HV®, NEXTorr®, NEXTorr HV®
and NEXTorr® StarCell families.
2. INTRODUCTION
2.1. General description
NEG POWER MINI is an electronic unit specifically designed to control the heating and the activation
process of the getter pumps whether they are or aren’t equipped with a thermocouple.
NEG POWER MINI can work in the low range of power with the smallest SAES NEG pumps requiring
low values of voltage / current / power with a precision around ± 0.1 V.
NEG POWER MINI can control one getter pump at a time, with an adjustable DC voltage output up
to 35V, current up to 5A, power up to 175W.
The controller is equipped with Ethernet and RS232 interfaces (to remote control the device) and
USB data interface (to record the device parameters on a USB flash memory).
The controller case is a sub-rack 3U 28TE 230mm deep (output connector on the back takes 30
mm of additional space, room for male connector should also be accounted for).
For the local use, it has an alphanumeric display to see the pump and the instrument parameters
and four buttons to scroll the menus and modify the parameter values.
It is also possible to control the NEG POWER MINI by the SAES remote control software (this
software can control multiple control units, and thus multiple pumps, at the same time).
During the working, the voltage and current output values are shown on the display (together with
the pump temperature if available). The voltage value, current value and pump temperature values
are provided through the Ethernet and serial communications, and they are also automatically stored
in USB flash memory if it is inserted in its slot.
The NEG POWER MINI has a security signal (INTERLOCK) to provide voltage to the pump:
the INTERLOCK contact is necessary to provide voltage to the output and, therefore, it allows to
shut down the output voltage to the pump with an external alarm signal.

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2.1. Main Features
The main features of the new NEG POWER MINI are the following:
- activation/conditioning/working for NEG pumps
- adjustable DC voltage output
- pump temperature monitoring
- very simple use by local control
- remote control via RS232 interface with Modbus protocol (RTU)
- remote control via TCP/IP network interface with Modbus protocol (TCP)
- diagnostic features (open/short connection, broken thermocouple, broken heating filament,
overheating control, ...)
- pump temperature limiter: for pumps equipped with a thermocouple, a limit on the maximum
temperature can be set by limiting the maximum power.
2.2. Electronic circuit features
NEG POWER MINI is a switching power supply, with an adjustable voltage output from 0 to 35V.
The instrument receives mains voltage (110÷240 VAC, 50÷60 Hz), converts it to DC voltage and
supplies the getter pump by means of a microprocessor-based electronic control card.
The unit front side has an alphanumeric display and 4 buttons that allow a user to interact.
The unit has, on the back, the instrument input for mains power supply IEC 10A plug with fuse, an
ON/OFF button to turn on/off the instrument, one OUTPUT pump connector, a fan, IN/OUT
interface connector with INTERLOCK contacts and RS232 serial interface, LAN connector for
remote control by standard network interface and the USB data interface (only for USB flash
memory logging).
External interlock alarm (alarm condition generated by the user’s vacuum system) is present, or the
provided bypassing DB9 connector can be used (have to be connect in the IN/OUT interface
connector).
If the getter pump is equipped with a thermocouple, NEG POWER MINI shows its temperature on
the display.
2.3. Remote and multi Control
Dedicated software is provided to remotely control the NEG POWER MINI through the Ethernet
connection. The software allows controlling several NEG POWER MINI units at the same time.
All functions and parameters can be easily controlled through the software.
Software allows controlling a single unit or more units at the same time.
Local and remote control are possible contemporarily.
This software is available for Windows and for Linux PCs.
The communication protocol via Ethernet and RS232 is MODBUS (TCP and RTU) (for more details
see the dedicated paragraph).

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2.4. The front panel of the unit
1. Alphanumeric display
2. MENU/ENTER button to edit the output parameters and to enter the setup menu
3. to reduce the selected value / scroll down in the menu
4. to increment the selected value / scroll up in the menu
5. START/STOP button to switch on/off the output
2.5. The rear panel of the unit
3
4
1
5
2
6
12
10
7
8
9
11

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6. Fan for instrument cooling
7. OUTPUT pump connector
8. USB connector (to record the device parameters on a USB flash memory)
9. Ethernet connector (to remote control the device)
10. IN/OUT interface connector with INTERLOCK and RS232 connector
11. ON/OFF instrument power switch
12. instrument mains plug
2.6. NEG POWER MINI Dimensions and Weight
 NEG POWER MINI dimensions 28TE 19” sub- rack, 3U, depth 230 mm
 NEG POWER MINI weight 1.5 kg
2.7. Supplied accessories
The following accessories are provided with NEG POWER MINI:
- Mains power cable with C16 plug and Schuko plug
- DB9 plug with PIN to bypass Interlock connections

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3. INSTALLATION
The unit may be installed on a desk or mounted in a rack. Place the instrument away from heat
sources. A gap of at least 5 cm must be left between the sides of the unit and adjacent walls to
ensure sufficient air flow to the cooling fan. If the NEG POWER is installed inside a cabinet, the latter
must be provided with vents capable of ensuring adequate air exchange between the inside and the
outside.
3.1. Rack mounting
Insert the instrument in the appropriate space (19” rack 3U according to DIN 41494 standard).
Fix the NEG POWER MINI front panel on the rack with four screws.
ATTENTION: the instrument cannot be used in potentially flammable or explosive areas.
ATTENTION: to avoid damages of the electronic circuit use the instrument within the
environment specified conditions.
ATTENTION: do not use accessories which are not supplied or recommended by the
manufacturer.
3.2. Electrical connections
The connections for the pump, the mains line, the interlock and the external interface are on the rear
panel of the instrument.
Before connecting the unit to the mains supply, make sure that supply voltage is within the range
specified in the section Electrical Specifications.
ATTENTION: protective earthing is required!
Plug the equipment into a supply outlet which has an earth connection.
3.3. Cleaning
ATTENTION: before starting any cleaning turn the unit off and remove all mains.
The units should be cleaned with a damp cloth when necessary.
The use of solvents or of an aggressive or scouring cleaning agent is not permitted.
Avoid spraying or spilling any type of liquid directly onto the unit.
Before putting the unit into operation mode, check that it is thoroughly dry.

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4. USAGE
NEG POWER MINI has an alphanumeric display and four buttons for the local control; it is also
possible to control the NEG POWER MINI by the SAES remote control software or by a customer
remote command sent in Modbus communication protocol
ATTENTION: Before starting to heat the getter pump, check it is under high vacuum level.
If heated in air, the getter pump could get damaged.
4.1. Initial setup
Before switching on the instrument, connect the power supply cable, the output cable towards the
pump and the interlock enable signal (or pre-cabled DB9 connector provided with the unit).
The unit is switched on by setting the I-O switch into position I. The display turns ON.
Note: The NEG pump is not electrically powered when the supply is switched on.
The first screen shows the name of the instrument and the software version.
After few seconds, the display changes to the Standby screen identified by the word “Standby” on
the first line.
The second line reports the current temperature read by the pump thermocouple (if equipped) or
three dashes that indicate the missing reading usually due to the fact the thermocouple is not
available in the pump.
Third line shows the 3 parameters that the user can set and, in the fourth line, the currently set values
are visible.
Vset is the voltage that will be applied to the pump.
Trise is the time in minutes that the unit will take to ramp the voltage up from 0 to Vset
Thold is the time until self switching off, that is the time interval during which the output shall be at

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Vset before switching off the power to the pump. It is possible not to give a value to Thold (three
dashes shown) which means that no self switching off will take place (the user will have to stop the
powering by acting on START/STOP button).
Factory default setting is Vset = 0.0V Trise =15’ Thold= --- (not set)
In order to modify setup values, press shortly MENU/ENTER.
A blinking cursor will indicate which parameter is currently being edited.
By shortly pressing arrow keys you will increment or decrement by 1 the value. A long pressure on
an arrow key will change the edited value fastly.
Pressing MENU/ENTER is the action to move to the next parameter. After the last value pressing
MENU/ENTER saves the values.
START/STOP activates and stops the power supply: pressing the button once starts supply and
pressing it again stops the supply at any time.
START/STOP is not enabled while editing parameters.
When you turn off and turn on NEG POWER MINI, the last settings and used parameters are
presented and you can use them again pressing start button without any other change.
So it is easy to choose the settings one time and use repeatedly on the same system; if you change
system or usage conditions you can choose the new appropriate settings.
During power supply to the pump, the Run screen is shown.
The second line reports the temperature of the pump (if available).
The third line shows the value of Vset as chosen in the Setup menu and alongside Ton indicating
the number of minutes from the beginning of the power supply to the pump.
Fourth line identifies the current output supply condition “Out” and we can read both voltage and
current.
After the end of power supply, whether obtained by pressing STOP or by self switching off, the
Standby screen is shown again.

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In the Run screen it is possible to change Vset value without interrupting output supply: this result
can be achieved by keeping pressed MENU/ENTER and acting at the same time on the arrow keys.
The new value will be active as soon as MENU/ENTER is released.
Please note that this value replaces the setting and after the end of current supply the Vset in the
Standby page will be also updated with the new value.
4.2. Setting Menu
With a long press on MENU/ENTER it is possible to enter in the pages to configure the instrument
parameters.
The pictures show the default parameters of NEG POWER MINI.
The first (read only) page shows the software version, the hardware version and the MAC address.
With the down arrow you can scroll to the second page.
Here MODBUS TCP can be enabled and IP parameters can be changed.
A short pressing on MENU/ENTER activates editing of the first field and moves to the next field,
arrow keys change parameter values. After editing the last parameter (Port) the next pressing on
MENU/ENTER ends editing.
The following parameters are available:
Enable/Disable: Enable/Disable the Modbus over TCP/IP on the Ethernet interface
IP: IP address, the four bytes can be edited separately.
GW: the IP address of the gateway, the four bytes can be edited separately.
Mask: is the IP address net mask encoded as the number of bits corresponding to the network
portion of the IP address (for example 24 corresponds to 255.255.255.0)
Port is the TCP port where communication takes place.

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Third page shows Modbus RTU parameters for Modbus over RS232 (DB9 plug).
A short pressing on MENU/ENTER activates editing of the first field and moves to the next field,
arrow keys change parameter values. After editing the last parameter (Slave) the next pressing on
MENU/ENTER ends editing.
The following parameters are available:
Enable/Disable: Enable/Disable the Modbus over RS232
Baudrate is the serial port speed in bit/s
Parity is the parity bit configuration of RS232
Stop is the stop bit configuration of RS232
Slave is the slave ID of the instrument.
4.3. Maximum Allowed Pump Temperature
Fourth page is the additional protection parameter for the customer who wishes to use it.
By setting Tpump max, the maximum pump temperature is defined above which the instrument stops
supplying power to the pump.
By default it is not set (OFF).
4.4. Logging

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If a pen drive with FAT32 formatting is inserted in the USB port, the instrument automatically logs
the parameters during the run phase.
An “L” is shown to indicate that log is being recorded.
The log file is a text file organized in four columns: as described in the first line, the columns are:
time from the start, output voltage, output current, pump temperature.
In the second line we find the setting parameter values. The setting values are also reported in the
file every time they are changed.
See the following example:
# t[s]; Vout[V]; Iout[A]; Tpump[°C];
# Vset=24.0 Trise=000' Thold=000'
0;23.9;5.2;26;
10;24.0;5.2;26;
20;24.0;5.1;28;
30;24.0;5.1;31;
40;24.0;5.1;35;
50;24.0;5.1;39;
60;24.0;5.1;45;
70;24.0;5.0;52;
# Vset=26 Trise=000' Thold=000'
80;24.5;5.1;60;
90;26.0;5.3;69;
100;26.0;5.3;79;
110;26.0;5.3;93;
5. ABNORMAL SITUATION AND ALARM NOTIFICATION
If there are problems during the control of NEG pumps, the Alarm screen is shown.
Press the ENTER button to acknowledge the alarm and the Standby screen is shown again.
The most common situations are the following:
5.1. INTERLOCK Alarm

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This notification indicates that the interlock signal is open.
As we said before INTERLOCK (close contact) is an enable signal, so it is necessary to close short
interlock pins to provide power to the pump. You can provide the close contact with an external circuit
or with the pre-cabled DB9 connector provided with the unit.
5.2. PUMP OPEN Alarm
This notification indicates that the pump is not connected.
Please check that the cable is well connected to both the pump and the instrument.
If the alarm persists, please contact SAES GETTERS S.p.A. for assistance.
5.3. OVER CURRENT Alarm
This notification happens when the output current is permanently over 5A.
It indicates that the electrical setting is too high for that pump model.
Please, check on the pump manual the recommended voltage setting for your pump model and your
pump installation configuration, reduce the voltage setting in order to try again and contact SAES
GETTERS S.p.A. for any assistance you need.
5.4. PUMP OVER TEMPERATURE Alarm
If you are using the setting Tpump max (the maximum pump temperature allowed) this notification
indicates that the pump temperature exceeded the setting value and the instrument stops supplying
power to the pump (here for example 260°C)

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5.5. VMON - UNDER VOLTAGE - OVER VOLTAGE
Other possible alarm situations are VMON or UNDER VOLTAGE or OVER VOLTAGE.
These notifications indicate that there are some problems with the internal circuit and/or with the
internal reference voltage levels. Please, contact SAES GETTERS S.p.A. for assistance.

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6. RECOMMENDED SETTINGS
As explained in chapter 4 “USAGE” voltage to the pump is supplied according to the following time
graph.
where Vset, t_rise and t_hold are parameters that can be chosen by the user.
When the instrument is switch on the presented parameters are the last set during previous session,
Before switching the instrument on, you should make sure that the parameters are suitable for the
pump you intend to control in this specific session.
6.1. Voltage level for the correct heating
In the manual of each SAES pump you can find detailed instruction on how to operate your NEG
pump in the best way, the optimal target temperature and electrical conditions to reach it in all
different configurations where the pump can be installed; moreover you will find information about
installation and the impact on heating and required powering.
A general indicative rule is to apply the maximum voltage during activation of the pump in the nude
configuration (without jacket).
If the pump is with jacket, voltage to be applied should be reduced by 10-20% (this changes
according to the model and nipple size).
During conditioning a voltage of about 50% with respect to activation should be used.
If the pump is equipped with a thermocouple, you should always rely on the measured temperature.
If the target temperature cannot be achieved due to the system limitations, an increase of the
activation time should be foreseen.
The default values of Voltage, Current, Power and Temperature are the maximum recommended
settings for the selected pump.
They are recommended / necessary for pumps without jackets and without heat source nearby. If
the system includes a partial or a full jacket around the pump, a lower power is required to reach the
correct Temperature. For more details refer to the pump manual.
It is always possible to regulate Voltage value in the setup menu.
ATTENTION: SAES Getters is not responsible for damages due to improper use of the
power supply

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In the following table, for the example, the temperature and the corresponding voltage current and
power parameter settings are reported for activation and conditioning of the most popular SAES
getter pumps, like the CapaciTorr and the NEXTorr families, without jacket.
Activation
Mode Conditioning Mode
NAME Vmax Vmax
CT D100 9 V 3.5 V
CT D200 12 V 4 V
CT D400-2 16 V 7 V
CT D50 8 V 3 V
CT HV 200 35 11.3 V 3.3 V
CT HV 200 63 12.6 V 3.7 V
CT Z100 8 V 4 V
CT Z200 11 V 5 V
CT Z400 body 15 V 5 V
CT Z400 nude 18 V 7 V
GP50-2F 25 V 11 V
NXT D100-5 9 V 4.5 V
NXT D200-5 12.5 V 6 V
NXT D300-5 20 V 8 V
NXT D500-5 28 V 10 V
NXT HV 100 9 V 2.8 V
NXT HV 200 12 V 3.5 V
NXT HV 300 30 V 8 V
NXT Z100 9 V 4 V
NXT Z200 12 V 5 V
NXT Z300 24 V 9 V
NXT D500-StarCell 28 V 10 V
ATTENTION: SAES Getters is not responsible for damages due to improper use of the
power supply

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6.2. Slow Heating
Trise is the time that the unit will take to ramp the voltage up from 0 to Vset. Factory default is 15’.
If activation starts at room temperature and in general each time when possible, it is recommended
to use always a long Trise to heat the pump gradually. When supply start at an already high
temperature or in case fast heating is needed it is possible to reduce Trise down to 0 (in this case
Vset will be reached in a few seconds).
Once Vset is reached, Vset voltage is kept for Thold.
6.3. Heating without automatic stop
Some applications require special getter pumps (HV) that work when the getter material is
hot. NEG POWER MINI can be used to keep these pumps hot giving them the necessary
power continuously. To do this, t_hold = --- (not set) is used.
(to set t_hold = --- is the same as to put it = 0).
When t_hold = --- (not set) the power supply is only stopped by pressing the stop button.
t_hold = --- (not set) can also be used with standard NEG pumps when the pump need
heating for a very long time.

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7. THE OUTPUT CONNECTOR FUNCTION
The output connectors can be used for a possible connection of a device designed for
monitoring or controlling the supply activity.
IN/OUT INTERFACE is intended for connection to protective hardware systems;
RS232 connector can be used for communication purposes via RS232 interface in
MODBUS RTU protocol.
LAN connector can be used for communication purposes via ETHERNET interface in
MODBUS TCP protocol.
(Modbus Application Protocol V1.1b3)
7.1. Pin layout of DB9 IN/OUT Interface connector
Interlock couple wires are open / short inputs. Short shall sustain at least 5 mA, open will
present a 12V voltage difference.
Alarm couple wires are open / short outputs. They can be read with a maximum voltage of
24 Vdc and a maximum current of 500 mA.

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8. ELECTRICAL SPECIFICATIONS
Input:
Maximum Power 3.5 kW
Supply voltage 110-240 V~, +/-10%
Frequency 50/60 Hz +/- 10%
Input Current 10 A max
Mains cord connector IEC Type 10A 250V
Over-Voltage category II
Pollution degree 2
Isolation type class I
Altitude max up to 2000 m
Operating Temperature 0°C to 40°C
Relative Humidity 80%
Noise at 1 mt < 40 dBA
Output:
Output power 175 W + overload
Output Voltage 0-35 V
Supply Current 5 A
Overload 110%
9. MAINTENANCE
The supply needs minimum maintenance. Depending on the dust levels in the environment where
the device is being operated, a periodic check of the device is desirable. In case of dust
contamination it can be cleaned by means of a vacuum cleaner.
For repair the supply should be shipped back to Saes Group S.p.A..