The resonant nature of this power supply guarantees high efficiency, a crucial factor to take into account when maintaining into operation a large number of power supplies in the same facility.
The current control loop of the DiRAC, as for all other CAEN ELS power supplies, is completely digital in order to guarantee the same configurability and ease of tuning to any load condition (resistive and inductive parts).
A new feature of the DiRAC units is the current control algorithm, which is performed directly by the on-board FPGA: the parallel nature of the computation allows to greatly reduce time delays in the feedback loop.
Output current setting is performed by the use of a DCCT (DC Current Transformer) that presents high long-term stability, good bandwidth, low noise and extremely low TC (Temperature Coefficient).
The use of state-of-the-art 18-bit SAR ADCs for current and voltage sensing guarantees a reduced group delay and thus higher bandwidth.
Internal interlocks and protections are redundant and distributed inside the DiRAC units e.g. the temperature is monitored by six different sensors placed in different sections of the board and the internal heatsinks.
The control board of the unit, hosting the FPGA, the diagnostic ADCs, communication sections, local control + display managing and other ancillary parts is the same used for the SY3634 and SY3662 system modules.
Command syntax and communication protocol compatibility are maintained with respect to the other CAEN ELS Power Supply systems.
Rated Output Current
PS120050: 120 A
PS135040: 135 A
Rated Output Voltage
PS120050: 50 V
PS135040: 40 V
Input Voltage
"A" version: 3 × 208 V(AC) @ 47-63 Hz
"E" version: 3 × 400 V(AC) @ 47-63 Hz
PF (Power Factor)
> 0.98
Topology
Three-Level ZVS Converter
Maximum Output Power
up to 6 kW
Maximum Inductive Load
100 mH (more upon request)
100 mH (more upon request)
18 bit
Output Current Read-Back
20 bit
Output Voltage Read-Back
20 bit
Accuracy
< 0.01%
Current Control Range
10 % - 100 %
Output Ripple (0-10kHz)
100 ppm / FS
Long Term Stability (8h)
< 20 ppm / FS
Load Regulation (±10% variation) - typ.
< ±5 ppm / FS
Line Regulation (±10% variation) - typ.
< ±5 ppm / FS
Temperature Coefficient (10-40 °C) - typ.
< 5 ppm / °C
DC/DC Efficiency
up to 90%
External Interlocks/States
4 Inputs: user-configurable contacts
2 Outputs: user-configurable
Internal Interlocks
Over-Temperature
Earth Fault Current
Regulation Fault
Fan Fault
AC Fault
Hardware Protections
Load energy dumping (free-wheeling)
Circuit breaker
Auxiliary ADC Read-Backs
Internal Temperatures
Earth Leakage Current
Cooling
Air convection - self-regulated internal fans
Connection
Ethernet TCP-IP / UDP
Extra-Features
Soft-start mode
Point-by-Point Current Waveform Loading User-definable interlock thresholds, active levels and timings FPGA Firmware Remote Update
User-settable Slew-Rate value
Dimensions
19" wide - 3U high Euro-mechanics rack
No documentation available.
No firmware or software available.