SAES NEG POWER User manual

M.HIST.0101.23 R2 January, 26th 2021
SAES Getters S.p.A. – Italy
www.saesgroup.com
USER MANUAL
NEG POWER
NEG Pump Controller
NEGPOWER
starting ...
* Copy Approved By DCM on 27/01/2021 * Uncontrolled copy when printed

M.HIST.0101.23 R2 Page 2 of 36 January, 26th 2021
The NEG POWER - NEG Pumps 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 laboratory temperature.
WARNING
The use of the instrument for any other purpose than 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.

M.HIST.0101.23 R2 Page 3 of 36 January, 26th 2021
INDEX
1.APPLICATION.............................................................................................................4
2.INTRODUCTION.........................................................................................................4
2.1.General description........................................................................................................ 4
2.2.MAIN FEATURES .......................................................................................................... 5
2.3.Electronic circuit features ............................................................................................... 5
2.4.Output power modules ................................................................................................... 5
2.5.NEG POWER: the front panel of the unit ....................................................................... 6
2.6.NEG POWER: the rear panel of the unit........................................................................ 6
2.7.NEG POWER SMALL: the front panel of the unit........................................................... 7
2.8.NEG POWER SMALL: the rear panel of the unit ........................................................... 7
2.9.NEG POWER Dimensions and Weight.......................................................................... 8
2.10.NEG POWER SMALL Dimensions and Weight ............................................................. 8
3.INSTALLATION...........................................................................................................9
3.1.Rack mounting ............................................................................................................... 9
3.2.Electrical connections..................................................................................................... 9
3.3.Cleaning....................................................................................................................... 10
4.MODE OF OPERATION............................................................................................11
4.1.Power on ...................................................................................................................... 11
4.2.The General Menu ....................................................................................................... 11
4.3.The General Setup button............................................................................................ 12
4.4.The Setup Menu........................................................................................................... 15
4.5.The Limit Setup button ................................................................................................. 17
4.6.The SAVE and CANCEL buttons ................................................................................. 18
4.7.The START/STOP buttons........................................................................................... 18
4.8.The recommended settings.......................................................................................... 19
4.9.Heating (Activation/Conditioning) without stop............................................................. 20
4.10.Custom: a Generic Pump for Customer Settings ......................................................... 20
4.11.Alarms .......................................................................................................................... 21
4.12.Alarm history ................................................................................................................ 22
4.13.Information page .......................................................................................................... 22
5.THE OUTPUT CONNECTOR FUNCTION................................................................23
5.1.Pin layout of IN/OUT Interface connector..................................................................... 23
5.2.RS232 / RS485 Interface ............................................................................................ 23
6.Electrical Specifications.............................................................................................24
7.Summary Table of the NEG Pumps controlled by the NEG POWER........................25
8.PRODUCT CONFIGURATIONS AND ACCESSORIES............................................26
8.1.NEG POWER configurations and accessories:............................................................ 26
8.2.Pump cables and accessories:..................................................................................... 27
9.DECLARATION OF CE CONFORMITY....................................................................28
10.INSTRUCTION FOR INSTRUMENT DISPOSAL......................................................29
11.WARRANTY CONDITIONS ......................................................................................30
12.SERVICE...................................................................................................................31
12.1.Sales & Service Locations:........................................................................................... 31
APPENDIX A: Supply cables.............................................................................................32

M.HIST.0101.23 R2 Page 4 of 36 January, 26th 2021
1. APPLICATION
NEG POWER - NEG Pump Controller power supply is designed to operate the MK4 and MK5
NEG pumps series, namely GP SORB AC®, CapaciTorr®, CapaciTorr HV®and NEXTorr®families.
2. INTRODUCTION
2.1. General description
NEG POWER 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.
There are two versions: NEG POWER for up to 4 controlled pumps, NEG POWER SMALL
supporting up to 2 pumps only.
NEG POWER can control up to 4 different getter pumps at the same time, with an adjustable DC
voltage output up to 110 V, current up to 10A, power up to 700W.
It has a touch screen display to control all the pumps together and in a very friendly way; it is also
possible to control the NEG POWER by the SAES remote control software.
NEG POWER SMALL is the smaller version of NEG POWER that can control up to 2 different
getter pumps.
Both versions can be equipped with standard 700 W modules or with low power 150 W modules.
(see paragraph 2.4).
The most popular SAES NEG pumps are preset in the software (like the GP SORB AC®, the
CapaciTorr®, CapaciTorr HV®and NEXTorr® families), so that in order to activate the NEG pump
just the pump model must be selected and START button pressed.
Other pumps, not included in the list of presets, can be managed by “custom settings” by choosing
suitable operating parameters.

M.HIST.0101.23 R2 Page 5 of 36 January, 26th 2021
2.2. MAIN FEATURES
The main features of the new NEG POWER are the following:
- contemporary activation/conditioning up to 4 NEG pumps
- automatic recognition of the cable length
- local control by user friendly touch screen controller
- remote control by RS232/RS485 interface with Modbus protocol (RTU)
- remote control by TCP/IP network interface
- pump temperature monitoring and thermoregulation
- automatic power regulation for different pump configuration
- 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.
- stand-by mode: if the instrument is not operated for long time, it switches to stand-by mode. In
this state, the power consumption of the instrument is reduced. The stand-by mode can be ended
by a touch on the display of the NEG POWER.
2.3. Electronic circuit features
NEG POWER is a switching power supply, with an adjustable voltage output from 0 to 110 V. 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 has a ON/OFF button to turn on/off the instrument, a touch screen display that allows a
user to interact with it, and a LAN connector for remote control by standard network interface.
The unit has, on the back, four OUTPUT pump connectors, two fans, RS485 serial interface
connector, IN/OUT interface connector and the instrument input for mains power supply
(MAININPUT) IEC 16 A plug.
External interlock alarms (alarm condition generated by the user’s vacuum system) are present,
one for each current output (on IN/OUT interface connector).
If the getter pump is equipped with a thermocouple, NEG POWER shows its temperature on the
display.
2.4. Output power modules
NEG POWER can be equipped with two types of modules: standard and low power modules.
Standard power modules of 700 W are can be used to control SAES NEG pumps requiring higher
power during the activation.
Low power modules of 150 W can be also installed in the NEG POWER to work in the low range of
power with the smallest SAES NEG pumps requiring low values of power / voltage / current with a
precision around ± 0.1 V.
The two types of module can be mixed up in different slots in the same instrument.

M.HIST.0101.23 R2 Page 6 of 36 January, 26th 2021
2.5. NEG POWER: the front panel of the unit
1. ON/OFF instrument power switch
2. touch screen display
3. LAN connector: RJ45 connector for Ethernet
4. handles for transport
2.6. NEG POWER: the rear panel of the unit
5. instrument MAININPUT IEC 16 A: plug for mains power supply
6. IN/OUT interface connector with INTERLOCKS
7. RS485 serial interface
8. Fan for power modules 1 and 2
9. Fan for power modules 3 and 4
10. OUTPUT 1 pump connector
11. OUTPUT 2 pump connector
12. OUTPUT 3 pump connector
13. OUTPUT 4 pump connector
2
6
11
12
10
13
5
7
89
1
3
4

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2.7. NEG POWER SMALL: the front panel of the unit
14. touch screen display
2.8. NEG POWER SMALL: the rear panel of the unit
15. instrument MAIN INPUT IEC 16 A: plug for mains power supply
16. ON/OFF instrument power switch
17. IN/OUT interface connector with INTERLOCKS
18. LAN connector: RJ45 connector for Ethernet
19. Fan for power modules 1 and 2
20. OUTPUT 1 pump connector
21. OUTPUT 2 pump connector
14
16
15
18
17
21
20
19

M.HIST.0101.23 R2 Page 8 of 36 January, 26th 2021
2.9. NEG POWER Dimensions and Weight
NEG POWER dimensions 19” rack, 3U, depth 460 mm
NEG POWER weight (with 1 power module) 10 kg
NEG POWER weight (with 2 power modules) 12 kg
NEG POWER weight (with 3 power modules) 13.5 kg
NEG POWER weight (with 4 power modules) 15 kg
2.10. NEG POWER SMALL Dimensions and Weight
NEG POWER SMALL dimensions ½ 19” rack, 3U , depth 445 mm
NEG POWER weight (with 1 power module) 10 kg
NEG POWER weight (with 2 power modules) 12 kg

M.HIST.0101.23 R2 Page 9 of 36 January, 26th 2021
3. INSTALLATION
NEG POWER is designed to be mounted in a 19” standard 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. When 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.
NEG POWER SMALL can be used mounted in a rack or also on a desk on its rubber feet.
For use on a desk the socket-outlet shall be installed near the equipment and shall be easily
accessible.
NEG POWER (standard size) can be installed exclusively in a rack and it can be connected to the
main line through the rack (it is not intended for direct connection to AC Mains Supply) and the
rack must be equipped with a disconnecting means (bipolar) from the power supply
3.1. Rack mounting
Insert the instrument in the appropriate space (19” rack 3U according to DIN 41494 standard).
Fix the NEG POWER front panel on the rack columns with four M6 screws.
NEG POWER SMALL is half 19” rack large. It is prepared with lateral holes to fix it on rack with two
brackets.
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 place the equipment so that it is difficult to operate the disconnecting
device
ATTENTION: no type of fuse or internal component can be replaced or modified by the user.
ATTENTION: do not use accessories which are not supplied or recommended by the
manufacturer.
3.2. Electrical connections
The connections for the pump, the input 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.
ATTENTION: use only adequate rated cords to connect instrument to the mains supply

M.HIST.0101.23 R2 Page 10 of 36 January, 26th 2021
3.3. Cleaning
ATTENTION: before starting any cleaning turn the units off and remove all mains.
The units should be cleaned with a damp cloth when necessary.
The use of solvents an aggressive or scouring cleaning agent is not permitted.
Avoid spraying or spilling any type of liquid directly onto the unit.
Before putting the units into operation mode to check them that are thoroughly dry.

M.HIST.0101.23 R2 Page 11 of 36 January, 26th 2021
4. MODE OF OPERATION
NEG POWER has a touch screen display to control all the pumps together and in a very friendly
way; it is also possible to control the NEG POWER by the SAES remote control software.
The most popular SAES NEG pumps are preset in the software (like the GP SORB AC, the
CapaciTorr, CapaciTorr HV and NEXTorr families).
ATTENTION: Before starting to heat the getter pump, check it is under high vacuum level.
If heated in air, the getter pump could burn.
4.1. Power on
Turn on the NEG POWER pushing the ON/OFF power button.
Wait some seconds for the display to switch on and the instrument to initialize.
4.2. The General Menu
When the instrument is switched on, the general menu is shown. This same screen is meant to be
used during normal operation as a summary of the overall status.
This menu presents an overview of main operational parameters, pump status, model, electrical
and temperature values and on time.
This menu is read only and does not allow any changes to the configuration.
On the right side of the screen, 4 start/stop buttons allow switching on/off the outputs one by one
and they are visible in most pages (see paragraph 4.7).
The General Setup button

M.HIST.0101.23 R2 Page 12 of 36 January, 26th 2021
4.3. The General Setup button
A Setup button is present in the General menu. It allows to access menus of instrument settings:
Date and time settings, Network settings, Modbus Server Settings, Output Channel Settings,
Brightness and Standby time.
SAVE button saves the changes. BACK button leaves the menu.
REBOOT button restarts the firmware.
Five different pages are shown by pressing the arrow navigation keys:
Date and Time Settings: set current date and time
Network Settings: if your network is equipped with DHCP server, you can use DHCP for
automatic IP address assignment, otherwise select Static and press edit to change IP Address and
network mask, Default Gateway and DNS.
The default setting is static IP address 192.168.1.10 / 24. “/24” is the same as network mask equal
to 255.255.255.0.

M.HIST.0101.23 R2 Page 13 of 36 January, 26th 2021
Modbus Server Settings: Modbus can be configured to operate over serial RS232 or RS485 and
in this case Serial port physical parameters and Slave ID (1...256) can be configured. Modbus can
also be configured to work over TCP/IP and in this case the network setting parameters apply.
Output Channel Settings: for each output the Insulation Alarm can be masked (bypassed).
Logging can be disabled or log data cleared for each output.
The log files (one per each output and per each Start command) can be downloaded connecting
with to a network share (replace IP address with the correct one):
192.168.1.10\negpower
Log files are stored in RAM so they are lost after power off cycle.
NEG POWER is able to detect the Output Insulation Losses making a check between
positive/negative power wire and ground wire or between thermocouple wires and ground wire.
In some system it is possible that the negative power wire and ground wire are shorted. NEG
POWER detects this particular condition as an Insulation Loss and shows an alarm. In order to
avoid this situation, it is possible enable/disable this check.

M.HIST.0101.23 R2 Page 14 of 36 January, 26th 2021
System settings: choose the screen brightness and standby delay (from 0 = never to 4 hours of
inactivity).

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4.4. The Setup Menu
A setup page is present for each output (1...4).
Touch the output to be set.
Status indicates the status of the output. It can assume 5 different values:
IDLE:the power supply is ready to give power to this output.
CHECK OPEN: first check made before starting the power supply in order to ensure that the pump
is connected.
RAMP: output is powered and the power is rising (t_rise time).
HOLD: ramp is finished and the power is maintained.
ALARM: there is some problem with the settings or with the output.
Touch the pump name to select the pump model to be controlled. A new window appears
on the screen: touch the pump model to be selected (for example CapaciTorr D1000 in the
example below).
The system shows automatically the list of SAES pumps that can be controlled with that
output. In the left example picture below a list of pumps for standard 700 W module is
shown, whereas the right picture shows the list that will appear when the low power module
(150 W module) is installed.
1
2
1
3
2
4
4b
5

M.HIST.0101.23 R2 Page 16 of 36 January, 26th 2021
Selecting the pump model, the recommended settings are preloaded (instructions to
change these values are reported at point 4).
please note that these settings are for pumps without jackets.
CABLE is an automatic recognition of the cable length (if the cable supports the feature). It can not
be changed by the user. In case of very long cables this value is used for automatic loss
compensation (see Vcable at point 4).
Select the preferred heating mode.
The heating mode can be chosen between ACTIVATION mode and CONDITIONING
mode.
The ACTIVATION mode provides the power required to heat the getter material in order to
activate it.
The CONDITIONING mode provides the power required only to recondition the getter
material. The conditioning mode might be helpful to pre-condition the pump during the
baking process.
The selected mode is highlighted by turning the button to red background. If some working
parameters are changed, the red highlighting disappears (see point 4).
On the right half of the screen, the working parameters are shown.
The default values can be modified: touch the parameter value (its background turns to
yellow) and use the + and - buttons (4b) to increase or decrease the value.
When Vmax, Imax, Pmax and/or T are changed, an asterisk is marked beside the pump
name and the Activation and Conditioning buttons are no longer highlighted.
t_rise and t_hold can be changed for each output; however they do not belong to the pump
specific working parameters.
The parameters are explained in the following:
t_rise is the time in minutes to ramp up the power from 0 to Pmax; 15 to 30 minutes are
usually recommended if starting from room temperature, default is 15 minutes.
t_hold is the time in minutes (starting after t_rise) during which power is held at the maximum
value; after t_hold the output is turned off automatically. Setting t_hold = 0 (that is ), which is
also the default value, the output is not turned off automatically but only with the stop button;
60 minutes or more are recommended. 60 minutes are enough for activation if working at the
maximum recommended temperature Tmax, more time is better and is necessary if the
system must stay at a lower temperature.
3
4

M.HIST.0101.23 R2 Page 17 of 36 January, 26th 2021
Vmax Imax Pmax and Tmax are the target and the maximum values. These values can be
chosen independently from each other. NEG POWER output will increase the voltage until the
first of these limits is reached and will keep that working point for t_hold time. In other words if
one of these parameters (i.e., V, I, P and T) reaches the max set value, the other parameters
will be reduced accordingly.
For example: set
Vmax = 10V Imax = 6A Pmax = 70W and Tmax = 450°C
Let’s assume that the working point of the NEG POWER is
V = 10V I = 5A so P = 50W and T = 400°C
NEG POWER stays in this working point because the output has reached Vmax and cannot
exceed it.
Tmax is the temperature target to be set if the pump is equipped with a thermocouple. If the
pump has a thermocouple it is recommended to use it. The pump temperature is very much
related to the system configuration. If your pump isn’t equipped with a thermocouple this value
can be decreased until NO TCK appears, which means that NEG POWER is configured to
work without a thermocouple (an alarm is raised if Tmax is set in a pump without a
thermocouple).
The start button can now be pressed.
On the left half of the screen, Vout, Iout, Temp and Time On current values are shown.
A Limit Setup button is present in this menu.
4.5. The Limit Setup button
By pressing Limits Setup button a subpage is accessed that allows to configure a security
limit on V, I, P and T. If any parameter reaches its limit, the output is switched off.
5

M.HIST.0101.23 R2 Page 18 of 36 January, 26th 2021
4.6. The SAVE and CANCEL buttons
For each channel there are two independent presets: one for activation and one for conditioning.
Presets can be saved to permanent memory or changes can be cancelled restoring previous
settings.
SAVE
CANCEL
4.7. The START/STOP buttons
START / STOP buttons are the first indicator of the status of the output.
If the output cable is well connected, START button is enabled to start supplying the power.
During the supply, STOP button is enabled to stop supplying the power.
If there are or there have been some problems that the user has not acknowledged yet, the
button is disabled.

M.HIST.0101.23 R2 Page 19 of 36 January, 26th 2021
4.8. The recommended settings
When a pump model is selected in the Setup Menu a collection of recommended settings for the
selected pump have been preloaded.
In Activation Mode parameters for the pump activation are preloaded, and in Conditioning Mode
parameters for the pump conditioning are preloaded instead.
All parameters are adjustable in the setup menu, but every change of selected pump model or of
operating mode (Activation/Conditioning) restore the default settings.
When you turn off and turn on NEG POWER, the last settings and used parameters are presented
and you can use again pressing start button without any other change. This happens because
NEG POWER stores permanently the current parameters when you press start button.
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 restore default settings and make changes from there.
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 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 Current and Power values in the setup menu.
NEG POWER operates with a Temperature Control if Tmax parameter is set.
If the pump is equipped with a thermocouple and the Tmax parameter is set to any value apart
from NO TCK, NEG POWER operates with a Temperature Control.
It is recommended to use a Temperature Control whenever it is possible.
In case the thermocouple is not available for the selected pump model, set Tmax parameter to NO
TCK: in this case NEG POWER operates with a Power Control, always limited by Voltage and
Current set values.
Especially when NEG POWER operates with Power Control, in order to reach the correct
Temperature without exceeding it, it is very important to set the appropriate set of Voltage Current
Power values for the specific system configuration.
An example of possible ranges of parameter values are listed in the following table for Activation
Mode with and without jacket; for more details, please, refer to the pump manual.
Activation Mode without jacket with jacket
°C V A W
V A W
NAME DESCRIPTION Tmax Vmax Imax Pmax Vmax Imax Pmax
GP 200 st 707 450 °C 52 V 3.8 A 200 W 42 V 3.2 A 134 W
CT D400-2 st 172 (450 °C) NO
TCK 16 V 5 A 90 W 12 V 4.5 A 54 W
CT D1000 st 172 550 °C 43 V 4.3 A 190 W 35 V 3.4 A 119 W
CT D2000 st 172 450 °C 110 V 4.6 A 500 W 82 V 3.5 A 287 W
ATTENTION: SAES Getters is not responsible for damages due to improper use of the
power supply

M.HIST.0101.23 R2 Page 20 of 36 January, 26th 2021
4.9. Heating (Activation/Conditioning) without stop
Some applications require special getter pumps (HV) that work when the getter material is hot.
NEG POWER can be used to keep these pumps hot giving them the necessary power
continuously. To do this, t_hold = is used (to set t_hold = reduce t_hold down to 100 and
press down again). When t_hold = the power supply is only stopped by pressing the stop
button.
4.10. Custom: a Generic Pump for Customer Settings
NEG POWER software is preset to know the activation/conditioning parameter settings of the most
popular SAES getter pumps, like the GP SORB AC, the CapaciTorr, CapaciTorr HV and the
NEXTorr families (see the Summary Table of the NEG pumps controlled by the NEG POWER).
In the software there is also a Generic Pump named Custom.
If the used pump model isn’t included in the list, Custom pump can be selected and settings of
suitable voltage, current, power and temperature must be set for the specific pump model.
The default settings for Custom pump are the following. These values can and shall be changed.
In case of standard 700 W module:
Activation Mode Conditioning Mode
NAME Tmax Vmax Imax Pmax
Tmax Vmax Imax Pmax
Custom 500 °C 50 V 4.5 A 500 W 250 °C 25 V 2.5 A 250 W
In case of low power 150 W module:
Activation Mode Conditioning Mode
NAME Tmax Vmax Imax Pmax
Tmax Vmax Imax Pmax
Custom 500 °C 20.0 V 4.5 A 100 W 200 °C 5.0 V 2.5 A 15 W
ATTENTION: SAES Getters is not responsible for damages due to improper use of the
power supply