Quantum Instruments Splitter Boxes - Manual (Page 60)

60
Selection
0
Power supplies
0
Power supplies for d.c. control circuits
Phaseo ® regulated switch mode power supplies
Selection of power supplies
2 The characteristics to be taken into account when selecting a power supply are:
- the required output voltage and current,
- the mains voltage available in the installation.
An initial selection can be made using the table opposite.
This may however result in several products being selected as suitable.
Other selection criteria must therefore be taken into account.
b The quality of the mains power supply
The Phaseo range is the solution because it guarantees precision to 3% of the output
voltage, whatever the load current and the input voltage. In addition, the wide input
voltage range of Phaseo power supplies allows them to be connected to all mains
supplies within the nominal range, without any adjustment.
The Phaseo RP family can also be connected to c 110 and 220 V emergency
supplies.
b Harmonic pollution (power factor)
The current drawn by a power supply is not sinusoidal. This leads to the existence of
harmonic currents which pollute the mains supply. European standard EN 61000-3-2
limits the harmonic currents produced by power supplies. This standard covers all
devices between 75 W and 1000 W, drawing up to 16 A per phase, and connected
directly to the public mains power supply. Devices connected downstream of a
private, low voltage general transformer are therefore excluded.
Regulated switch mode supplies always produce harmonic currents; a filter circuit
(Power Factor Correction or PFC) must therefore be added to comply with standard
EN 61000-3-2.
Phaseo ABL 7RP, ABL 7UES and ABL 7UPS power supplies conform to standard EN
61000-3-2 and can therefore be connected directly to public mains power supplies.
b Electromagnetic compatibility
Levels of conducted and radiated emissions are defined in standards EN 55011 and
EN 55022.
The majority of products in the Phaseo range have class B certification and can be
used without any restrictions due to their low emissions.
ABL 7CEM24003 and ABL 7CEM24006 power supplies have class A certification. It
is recommended that they should not be used in the following equipment: trains,
aircraft, nuclear applications and in any environment where malfunctioning could
cause serious injuries or lead to death. These products are designed for use in
industrial equipment and are not suitable for use in residential environments.
b Behavior in the event of short-circuits
Phaseo power supplies are equipped with an electronic protection device. This
protection device resets itself automatically on elimination of the fault (around
1 second for ABL 7 RE/RP, around 3 seconds for ABL 7 UE/UP/REQ) which avoids
having to take any action or change a fuse. In addition, the Phaseo ABL 7RP/U/REQ
ranges allow the user to select the reset mode in the event of a fault:
- in the "AUTO" position, resetting is automatic,
- in the "MANU" position, resetting occurs after elimination of the fault and after
switching the mains power off and back on.
This feature allows Phaseo ABL 7RP/U/REQ power supplies to be used in
installations where the risks associated with untimely restarting are significant.
b Behavior in the event of phase failure
In the event of failure of one phase, all Phaseo 3-phase power supplies switch to
relaxation mode for as long as the input voltage is below 450 V.
For operation on higher voltages (e.g. 480 V), use of an upstream GV2 type residual
current protection device is recommended.
b Selection of reset mode
v on the ABL 7RP family of products:
By microswitch on the front panel of the product.
v on the ABL 7U/REQ family of products:
By jumper on the front panel. Warning: selection of the function is only possible
after the mains power supply has been switched off for at least 5 minutes. The
jumper is moved using a pair of insulated, flat-nose pliers.
Presentation :
pages 58, 59 Characteristics :
pages 62 - 65 References :
page 67 Dimensions :
page 68 Schemes :
page 69
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com