AimTTi QPX750SP User manual

INSTRUCTION MANUAL
EN
INSTRUCTION MANUAL
QPX750SP
750W Laboratory Power Supply

CONTENTS
1Product Description.......................................................................................................................2
2Safety...............................................................................................................................................3
2.1 Symbols..................................................................................................................................................3
2.2 Safety notices .........................................................................................................................................4
3Installation ......................................................................................................................................5
3.1 Mounting.................................................................................................................................................5
3.2 Ventilation ...............................................................................................................................................5
3.3 Electrical Requirements..........................................................................................................................5
4Instrument Overview......................................................................................................................6
4.1 Front Panel .............................................................................................................................................6
4.2 Rear Panel..............................................................................................................................................8
5Getting Started .............................................................................................................................10
5.1 Using this manual .................................................................................................................................10
5.2 Switching on .........................................................................................................................................10
5.3 Home Screen / Settings Menu.............................................................................................................. 11
5.4 Meter status..........................................................................................................................................12
5.5 Status bar .............................................................................................................................................14
5.6 Navigation controls ...............................................................................................................................15
6Menu ..............................................................................................................................................16
6.1 Instrument.............................................................................................................................................16
6.2 System..................................................................................................................................................20
6.3 Interface................................................................................................................................................21
6.4 Messages .............................................................................................................................................22
6.5 Info........................................................................................................................................................23
6.6 Help ......................................................................................................................................................23
6.7 File Ops ................................................................................................................................................23
6.8 Defaults ................................................................................................................................................24
6.9 Calibration ............................................................................................................................................24
7Messages. .....................................................................................................................................25
7.1 Error Messages ....................................................................................................................................25
7.2 Warning messages ...............................................................................................................................25
7.3 Information messages ..........................................................................................................................25
8Maintenance..................................................................................................................................26
8.1 Cleaning ...............................................................................................................................................26
8.2 Firmware update...................................................................................................................................27
9Remote Operation ........................................................................................................................28
9.1 USB Interface .......................................................................................................................................28
9.2 LAN Interface........................................................................................................................................29
9.3 GPIB Interface ......................................................................................................................................31
9.4 Status Reporting...................................................................................................................................32
9.5 Remote/ local operation........................................................................................................................36
9.6 Parameter Data Format........................................................................................................................37
9.7 Command List ......................................................................................................................................37
9.8 SCPI Commands..................................................................................................................................38
9.9 SCPI Subsystems.................................................................................................................................39
10 Factory default settings...........................................................................................................43
11 Specification .................................................................................................................................44
11.1 Output Specifications............................................................................................................................44
11.2 Meter Specifications .............................................................................................................................45
11.3 Display Features...................................................................................................................................46

1 - Product Description
2QPX750 Instruction Manual
1PRODUCT DESCRIPTION
The QPX750 is a single output laboratory power supply with a
maximum output power of 750 watts.
The PoweFlex+ design provides voltages up to 80V, currents up
to 50A and flexible modes of operation (CC, CV, and CP) with
automatic crossover, while offering an exceedingly wide range
of operation, as detailed in the PowerFlex + curve.
This power supply achieves unusually low noise of <3mV rms at
full power and good transient response of <2ms.
This high feature Power Supply displays load power and load
impedance in addition to measurements of output voltage and
current. The load impedance calculation enables low resistance measurements to be made at high
currents by creating a four-terminal connection, using the remote sense terminals. Also provided is a
meter averaging function to dampen the load current- this can be selected in order to achieve more
accurate results when measuring rapidly varying loads.
This versatile power supply offers Analog and Digital interface for remote control and Test System
integration. Remote Communication is Standard with 2 interfaces: USB and LAN. An optional GPIB
interface is also available. Analog inputs provide remote control of the output volts and current while
Analog outputs provide monitoring of the output Voltage and current. Digital Opto isolated logic
signals provide an input that can control the output state on and off and an output confirms the
operating state; current limit, power limit, or any fault trip.
Housed in a ½ rack width, 3U high case with front input ventilation, an intelligent fan is used to
minimise cooling noise. It is suited to both bench-top and system applications.
The instrument has two ranges: 50V or 8 0 V. The unit is set on the SELV setting of 50V to reduce the
risk of hazardous voltages and simplifying compliance with the safety requirements.
NOTE
By default, the range that allows a maximum of 80V is
disabled. To enable the 80V range- the user must manually
select this range. Before confirming this choice, a warning
will appear to inform of the risk.

2 - Safety
3QPX750 Instruction Manual
2SAFETY
2.1 Symbols
This instruction manual contains information and warnings which must be followed by the user to
ensure safe operation and to retain the instrument in a safe condition.
The following symbols are displayed on the instrument and throughout the manual, to ensure the
safety of the user and the instrument, all information must be read before proceeding.
WARNING
Indicates a hazard that, if not avoided, could result in injury or death.
CAUTION
Indicates a hazard that could damage the product and may result in loss of important
data or invalidation of the warranty.
NOTE
Indicates a helpful tip.
EXAMPLE
Indicates an example to show further details.
Terminal connected to
chassis ground.
Instrument in STANDBY.
l
Mains supply ON.
Alternating current.

2 - Safety
4QPX750 Instruction Manual
2.2 Safety notices
This instrument is:
·A safety Class I instrument according to IEC classification and has been designed to meet the
requirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement,
Control and Laboratory Use). It is an Installation Category II instrument intended for operation from
a normal single-phase supply.
·Designed for indoor use in a Pollution Degree 2 environment in the temperature range 5°C to 40°C,
20% - 80% RH (non-condensing).
·Tested in accordance with EN61010-1 and has been supplied in a safe condition. This instruction
manual contains some information and warnings which have to be followed by the user to ensure
safe operation and to retain the instrument in a safe condition.
WARNING
Do not operate while condensation is present.
Do not operate outside its rated supply voltages or environmental range.
THIS INSTRUMENT MUST BE EARTHED.
Ensure that only fuses with the required rated current and of the specified type are used for
replacement.
The use of makeshift fuses and the short-circuiting of fuse holders is prohibited.
Use of this instrument in a manner not specified by these instructions may impair the safety
protection provided.
Any interruption of the mains earth connector, inside or outside, will make the instrument
dangerous. Intentional interruption is prohibited.
Any adjustment, maintenance, and repair of the opened instrument under voltage must be
avoided. When connected, terminals may be live and opening the covers or removal of parts
(except those that can be accessed by hand) may expose live parts.
Voltages above 60VDC are hazardous live according to EN 61010-1 and great care must be
taken when using the power supply at voltages above this level.
Capacitors inside the power supply may still be charged even if the power supply has been
disconnected from all voltage sources but will be safely discharged about 10 minutes after
switching off.
To avoid electric shock, or damage to the instrument, never allow water to get inside the case.
If the instrument is clearly defective, or has been subject to mechanical damage, excessive
moisture, or chemical corrosion, the safety protection may be impaired, and it must be
withdrawn from use and returned for repair.
CAUTION
Do not wet when cleaning, use only a soft dry cloth to clean the screen.
Do not use a sharp or pointed objects to operate the touch screen.
Take care not to restrict the inlet vents at the front, rear, sides or underneath the instrument.
In rack-mounted situations, allow adequate space around the instrument.
This instrument is protected by an internal fuse which is user serviceable (refer to Service Manual).

3 - Installation
5QPX750 Instruction Manual
3INSTALLATION
3.1 Mounting
For rack mounting, the feet should be removed such that the instrument can be fitted beside any
other standard 3U half-rack instrument in a 19” rack. A suitable 3U 19” rack kit is available from the
manufacturer or their overseas agents- a RM460 19-inch rack kit accommodates two instruments.
3.2 Ventilation
The instrument uses a fan, which has variable speed control, fitted to the rear panel. Take care not to
restrict the rear air exit or the inlet vents at the front (sides and underneath). In rack-mounted
situations, allow adequate space around the instrument and/or use a fan tray for forced cooling.
3.3 Electrical Requirements
3.3.1 Mains operating voltage
This instrument has a universal input range and will operate from a nominal 115V to 230V mains
supply without adjustment. Check that the local supply meets the AC input requirement given in the
Specification.
3.3.2 Mains lead
Connect the instrument to the AC supply using the mains lead provided.
Should a mains plug be required for a different mains outlet socket, a suitably rated and approved
mains lead set should be used. Ensure this is fitted with the required wall plug and an IEC60320 C13
connector for the instrument end.
To determine the minimum current rating of the lead-set for the intended AC supply, refer to the
power rating information on the equipment or in the Specification.

4 - Instrument Overview
6QPX750 Instruction Manual
4INSTRUMENT OVERVIEW
4.1 Front Panel
4.1.1 Overview
4.1.2 ①Colour Touch Screen Display
CAUTION
Do not use sharp objects or pointed objects to operate the touch screen.
②Power Switch
Power Switch is located in the bottom left-hand corner. Press to start the unit.
CAUTION
When instrument is in Standby mode, Mains is still present.
③Numeric Keypad
Numeric keys permit direct entry of a value for the parameter currently selected.
④Escape Key/Local/OK
Entry can be abandoned at any point by pressing the ESCAPE key. It will also exit the selection or
screen currently selected. This key is also used to clear output trip conditions, together with their pop-
ups. Additionally, when in remote mode, this key is used to return the instrument to local operation.
The OK key is used to confirm a selection.
⑤Remote Sense Terminals
Allows the user to adjust the voltage at the point of the load. The instrument has a very low output
impedance, but this is inevitably increased by the resistance of the connecting leads and the contact
resistance between terminals and leads. At high currents, this can result in significant differences
between the indicated source voltage and the actual load voltage (even two 2mΩ connecting leads will
drop 0·2V at 50 Amps, for instance). This problem can be minimised by using short, thick, connecting
leads, but where necessary it can be completely overcome by using the remote sense capability.

4 - Instrument Overview
7QPX750 Instruction Manual
CAUTION
Voltage drop on sense leads should not exceed 2V.
NOTE
To avoid instability and transient response problems, care must be taken to ensure good
coupling between each output and sense lead; this can best be done by twisting the leads
together. An electrolytic capacitor directly across the load connection point may also be
beneficial. The voltage drop in each output lead must not exceed 1V.
⑥Output Terminals
The load should be connected to the positive (red) and negative (black) terminals marked OUTPUT.
The terminals accept 4mm plugs into the end (but note that 4mm plugs will only support 30 Amps).
For currents greater than 30A, 6mm diameter wires, plugs or 8mm spade connections (with a
maximum blade width of 16mm) can be accepted into the cross-hole.
WARNING
The wiring and connectors must be capable of supporting the current required; for 50
Amps, 6mm2cable is needed.
WARNING
Voltages above 60VDC are hazardous live according to EN 61010-1 and great care must
be taken when using the power supply at voltages above this level.
Always make connections to the instrument with the OUTPUT off.
CAUTION
Exceeding the maximum reverse voltage (90V) and current (3A) will damage the unit.
⑦ Volts/Amps/Lock
Pressing either V or I to adjust the Voltage or Current, respectively. The LOCK key will light when active,
indicating that the entire front panel is locked. In this mode, only navigation between menus is
permitted. Long press for 3 seconds to deactivate the lock.
⑧ Rotary knob and Directional Keys
The rotary knob is used to navigate the user interface- it features a ‘press’ function to select an option.
See ‘Rotary knob’ for more details.
The direction keys are used for navigating parameter windows and scrolling numeric parameter values.
In addition, the left directional key can be used as a backspace during editing. See ‘Front Panel Keys’
for more details.

4 - Instrument Overview
8QPX750 Instruction Manual
4.2 Rear Panel
①AC power inlet
②GPIB (optional)
Requires GPIB 1A user retrofittable option. The default GPIB address is 11.
③LAN
The LAN interface is designed to meet 1.5 LXI (LAN extensions for Instrumentation) Core 2016.
Remote control using the LAN interface is possible using a TCP/IP Socket protocol.
④USB
The USB port accepts a standard USB cable. The Windows plug-and-play functions should
automatically recognise that the instrument has been connected.
⑤Terminal Block
Press the orange actuators of the screwless terminals, insert the
connecting wire and release the actuator to secure the connection.
NOTE
Minimum recommended cable 0.4mm, maximum. 0.8mm diameter
cable. Always use shrouded ferrules to prevent the risk of shock.
Logic Control:LOGIC COMMON, LOGIC IN, LOGIC OUT, NC (no connection) see ‘Logic Control’for setup
and configuration details. LOGIC IN is connected to the input of an isolating opto-coupler via an 820Ω
resistor in series. The input is activated by an input voltage greater than approximately 3.3V between
LOGIC IN and LOGIC COMMON
LOGIC OUT is an isolated rear-panel open-collector output that will sink up to 2mA when active
CAUTION
Do not apply an input voltage greater than 20V.
Do not apply volts greater than 30Vdc to LOGIC OUT
Analog Control / Monitor: I CONTROL, V CONTROL, COM, COM, I MONITOR, V MONITOR See ‘Analog
Control’ for setup and configuration details.

4 - Instrument Overview
9QPX750 Instruction Manual
V CONTROL and I CONTROL are 0…5V or 0…10V inputs with respect to COM terminal that provide
quasi-analogue control of the Output Voltage and Current Control, respectively.
The output terminal voltage and output current may be monitored on V MONITOR and I MONITOR,
respectively. V MONITOR and I MONITOR are always available at the rear.
CAUTION
V and I CONTROL inputs are differential, with a limited common mode range of ± 2.5Vdc
with respect to the negative output. They should be driven from a ‘floating’ source such
as another power supply.
MONITOR outputs are differential with a limited common mode range of ± 2.5Vdc with
respect to the negative output. They should be connected to a measuring system with
‘floating’ inputs such as a DMM.
Do not apply volts greater than 20VDC to ANALOG CONTROL terminals, with respect to
COM.
Output Remote Sense:-S, +S See 'Remote Sense Terminals’ for more details.
WARNING
ANALOG CONTROL /MONITOR and SENSE terminals are referenced to the output
negative Output terminal. Voltages above 60VDC are hazardous live according to EN
61010-1 and great care must be taken when using the power supply at voltages above
this level.
Always make connections to the instrument with the OUTPUT off.
⑥Output Terminals
Refer to Output Terminals on front panel.
NOTE
The M4 threaded screw marked provides a connection point to safety earth ground.
A M4 Ring tab must be used, with an appropriate washer