35
NATIONAL
INSTRUMENTS
3.8.7 Foldback Check
WARNING:
There is a potential shock hazard when checking a power supply with output voltage greater than
60VDC. Observe proper safety procedures during the checking.
Refer to Section 5.3.4 for explanation of the FOLD function prior to performing the procedure below.
1. Ensure that the output voltage is set to approx. 10% of the unit rating.
2. Adjust the Current encoder to set the current limit to approx. 10% of the unit rating.
3. Set Foldback to CC MODE.
4. Short the output terminals momentarily (approx. 0.5 sec.). Ensure that the output voltage falls
to zero, the Voltage display shows ”
FOd
”, Current display shows ”
FA I
” and the PROT red LED blinks.
5. Set Foldback to OFF. The output voltage remains zero.
6. Press OUTPUT button. Ensure that the output voltage returns to it’s last setting.
7. Turn the output off by pressing OUTPUT button. Ensure that the Voltage display shows ”
OFF
”.
3.9 Connecting the Load
Turn off the AC input power before making or changing any rear panel connection. Ensure that
all connections are securely tightened before applying power. There is a potential shock hazard
when using a power supply with a rated output greater than 60VDC.
WARNING:
There is a potential shock hazard when using a power supply with an output voltage greater than
60VDC. Turn off the AC input power before making or changing any rear panel connection.
Ensure that the protection of output bus-bars and output connectors is mounted and properly
assembled when output voltage exceed 60VDC. Ensure that all connections are securely tightened
before applying power.
3.9.1 Load Wiring
The following considerations should be made to select wiring for connecting the load to the
power supply:
• Current carrying capacity of the wire (refer to 3.9.2)
• Insulation rating of the wire should be at least equivalent to the maximum output voltage
of the power supply.
• Maximum wire length and voltage drop (refer to 3.9.2)
• Noise and impedance effects of the load wiring (refer to 3.9.4).
3.9.2 Current Carrying Capacity
Two factors must be considered when selecting the wire size:
1. Wires should be at least heavy enough not to overheat while carrying the power supply load
current at the rated load, or the current that would flow in the event the load wires were
shorted, whichever is greater.
2. Wire size should be selected to enable voltage drop per lead to be less than 1.0V at the rated
current. Although units will compensate higher voltage drop in each load wire (refer to the
specifications). It is recommended to minimize the voltage drop (1V maximum) to prevent
excessive output power consumption from the power supply and poor dynamic response
to load changes. Please refer to Tables 3-2 and 3-3 for maximum wire length to limit voltage
drop in American and European dimensions respectively.
Summary of Contents for RMX-410 Series
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