Power supply type range

Design principle

Series NTS ...		Printer friendly data sheet (PDF)
Features: High efficiency Short circuit proof and with unlimited operation at full current in short-circuit condition Sensor terminals for the compensation of the voltage drop on the power lines. By pre-setting the voltage, a linear current ramp can be generated Energizing and de-energizing voltage can be preset with a single potentiometer Constant voltage operation for linear up and down control Linear de-energization, with reverse voltage permitted up to the nominal value of the output voltage (2-quadrant operation) 3½ digits DVM for current and voltage Interlock loop to monitor the external load and internal loop as a standard

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Function:

Designed specifically for superconductivity applications, this superconductivity power supply family is series regulated via a set of parallel transistors which are driven from a pre-regulation stage which utilises phase controlled thyristors. In this manner,  the power lost across the output transistors is kept to as minimum. Thus, the final control element always has a low power dissipation in energizing and static constant current mode.
In de-energizing mode, the transistor stage is working as a current sink and the power is dissipated by means of either air or water cooling.

Design:

• Up to 200 A (or approx. 2.5 kW) table-top cases or plug-in units
• Units with higher current or power are supplied as 19" cabinets with castors. The side walls can be removed, the rear door can be locked
• All cabinets have removable crane-eyes
• Racks with 600 mm width, and larger, are suitable for fork lift transport
• Cooling:
  Up to approx. 1000 A (or approx. 5 kW de-energizing power), air cooling. For higher currents, or higher powers, water cooling with thermostatic valves for the control of the water flow is used (depending on the power)

Output:

	Output isolation: The output is floating. Operating voltage with respect to earth: for air cooled units max. ±300 V DC. For water cooled units max. ±100 V DC.
	Output terminals:  Up to 100 A, clamps on the rear. For higher currents the outputs are bolts or copper bars.

Technical Data:

• Mains connection: 

  Up to approx. 200A nominal current or approx. 1000W:	230 V ±10% 47 Hz to 53 Hz;
  For higher current or power:	400 V ±10% 47 Hz to 53 Hz 3-phase

• Ambient temperature: 0°C to +40°C

• All following data are guide values and will be adjusted according to the specification.
  (For explanations please refer to the Terms & Definitions page.)
  

  Setting range for current:	from approx. 0,1% to 100%
  Setting range for voltage:	from -100% to +100%
  Reproducibility:	±1 x 10-4 to ±1 x 10-6
  Setting resolution (potentiometer):	1 x 10-3
  Residual ripple (Voltage):	approx. 1 x 10-3pp
  Residual ripple (Current):	±1 x 10-4pp to ±1 x 10-6pp depending on inductivity of the load
  Run up time:	from 1 sec. to 100 h
  Deviation:  for ±10% mains voltage variation: for no load / full load: over 8 h under constant conditions: within the temperature range:	<± 1 x 10-5 <2 x 10-4 <±1 x 10-4 to ±1 x 10-5 <±1 x 10-4 to ±5 x 10-6 / K

Possible Options:

	Analogue programming
	Analogue programming, floating
	DVM with higher resolution
	Computer interface - IEEE 488, RS 232, RS 422, USB, LAN (Ethernet), Profibus DP (more on request)
	Higher stability
	Current control by electronic ramp with digital control; rise and fall times are adjustable manually or via computer interface
	Current limit setting either manually or via computer interface. Resolution up to 1 x 10-5 for external setting
	High speed turn-off input with adjustable threshold
	Quench detector to monitor the magnet
	Fast de-energizing in the event of quench or mains failure: A DC conductor or a semiconductor switch disconnects the power supply from the magnet. De-energization takes place with a power resistor, actuated at quench, or via an external circuit
	Short circuit switch (Current source 100mA for heating a sector of the superconducting circuit)
	Water cooling
	More options and special solutions on request.  We don't specify a range of standard types in this series, since every unit is designed and built according to each particular application. NTS Data Sheet: Zur Darstellung muss der ADOBE READER installiert werden!   to top of the page For prices please ask us or one of our representatives.