User and Programming Manual
XDS Series
35
4.5 Special
Features
The XDS Series offers some special features, which are explained in this section
4.5.1
Remote Inhibit / Remote Shutdown
The output of the DC supply can be controlled using a discrete input. This input is available on
connecter J22 at the rear panel of the XDS unit.
The Remote Inhibit or Remote Shutdown can be configured over the bus to operate in one of two
modes:
RI Mode
Description
0
Active Low. A TTL logic low signal level or switch closure between pin 1 and
pin 10 of J22 will DISABLE the output. This will override the front panel
OUTPUT ON/OFF button or remote output state.
This is the default mode.
1
Active High. A TTL logic low signal level or switch closure between pin 1 and
pin 10 of J22 will ENABLE the output. This will override the front panel
OUTPUT ON/OFF button or remote output state.
The SYST:CONF bus command may be used to set the polarity mode for the Remote Inhibit
shutdown input. Once set, send the SYST:SAVE command so the new mode is retained at power
up.
4.5.2 Bleeder
circuit
The DC supply has an amplifier that can source but can’t sink current. Under a no-load condition
the output voltage will remain unless there is a provision to bleed the voltage from the storage
capacitors across the output terminals. The XDS Series DC supply has a bleeder circuit that
when activated will drop the output from its present value to a value closer to zero volts in
approximately 150 milliseconds under a no-load condition. Actual times may vary by voltage
range model.
This special bleeder circuit will activate when the output voltage is programmed to a value that is
10% lower than its prior voltage setting. For example if the output is set to 80 volts the bleeder
will not activate if the voltage is programmed to 75 volts. If it is programmed to 40 volts however,
it will activate since 40 volts is more than 10 % less than 80 V. Once activated, the bleeder circuit
stays active until the voltage drops to 44 volts (110% of new setting). The bleeder circuit will
work with either internal or RPV programming.
4.5.3
Over Voltage Protection (OVP)
The XDS Series offers an over voltage protection mode. This mode protects the power supply
from over voltage damage.
The Over Voltage Protection (OVP) is controlled by the voltage measurements and as such
reacts to the measured output voltage rather than the programmed value.
When the actual output voltage exceeds the OVP level the controller will disable the output and
program the output to zero volts.
When operated from the front panel, the OVP level is fixed at 110% of the available voltage
range. When operated over the remote control interface, the OVP trip level can be set by the user
Содержание XDS 100-100
Страница 4: ...User and Programming Manual 4 XDS Series Electrical Safety Symbols Used in This Manual ...
Страница 27: ...User and Programming Manual XDS Series 27 Figure 3 5 Outline Drawing XDS DC Supply ...
Страница 41: ...User and Programming Manual XDS Series 41 Figure 5 4 Parallel Cable Interconnect Accessory ...
Страница 45: ...User and Programming Manual XDS Series 45 Figure 6 1 DC Power Supply Block Diagram IF option shown ...
Страница 69: ...User and Programming Manual XDS Series 69 Figure 8 3 Replaceable Fuse Locations ...