National Instruments RMX-4120 Guida all'installazione
SAFETY INFORMATION & INSTALLATION GUIDE
RMX Programmable Power Supplies
RMX-4120/4121/4122/4123/4124/4125/4126/4127
About the RMX Safety Information & Installation Guide
This guide is intended for users of the Regulated DC Power Supply and their instructors.
It is assumed that the reader has knowledge about electrical safety standards and the electrical
aspects of regulated DC power supplies.
Safety Guidelines
Indicates general danger, warning, or caution. When this symbol is marked on the
product, see the relevant section in the operation manual.
Indicates a location whose surface can become hot.
Protective conductor terminal.
Chassis (frame) terminal.
On (supply).
Off (supply).
Installation and Preparation
This section describes how to turn on an RMX programmable power supply, what kind of load
cables to use, and how to connect cables to the output connectors.
Note Protection provided by this equipment may be impaired if it is used in a
manner not described in the manual.
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Connecting the Power Cord
This product is a piece of equipment that conforms to IEC Overvoltage Category II (equipment
that consumes energy supplied from a fixed installation).
A power cord is not included with the RMX-4124/4125/4126/4127. Use a power cord that
conforms to this product’s rated AC input voltage, input current, and configured for the
plug type. Refer to your product specifications for details.
Caution Risk of electric shock. This product is a piece of equipment that conforms
to IEC Safety Class I (equipment that has a protective conductor terminal). Be sure
to earth ground the product to prevent electric shock. The product is grounded
through the power cord ground wire. Connect the protective conductor terminal to
earth ground.
RMX-4120/4121/4122/4123 (750 W Models)
Necessary Cable
•North America—Extra Hard Usage Cord, min. 300 V, 60 C, 14 AWG, 3 Conductor cord,
3 m or less with a NEMA 5-15P to C14.
•Europe—HAR Marked, min. 300 V, 60 C, 2.5mm2, 3 Conductor cord, 3 m or less with a
plug configured for the country of use to C14.
•International—Certified for country of use, min. 300 V, 60 C, 2.5mm2, 3 Conductor cord,
3 m or less with a plug configured for the country of use to C14.
The power cord can be used to disconnect the RMX programmable power supply from the
AC power line in an emergency. Connect the plug to an easily accessible power outlet so that the
plug can be removed from the outlet at any time. Be sure to provide adequate clearance around
the power outlet.
1. Check that the AC power line meets the nominal input rating of the product. The product
can receive a nominal line voltage in the range of 100 VAC to 240 VAC at 50 Hz or 60 Hz.
2. Check that the POWER switch is turned off.
3. Connect the power cord to the AC inlet on the rear panel.
4. Insert the power plug into a grounded outlet.
RMX Programmable Power Supplies Safety Information & Installation Guide |© National Instruments |3
RMX-4124/4125/4126/4127 (1500 W Models)
Caution Risk of electric shock. Before you connect the power cord, turn off the
switchboard breaker (a switch that cuts off the power supply from the switchboard).
Risk of fire. Connection to the switchboard must be performed by a person who has
knowledge about electrical safety standards and the electrical aspects of regulated DC
power supplies. The switchboard breaker must meet the requirements shown below.
Caution Inside the product, protective circuits are connected to match the polarity
of the input terminal. Be sure to connect the L, N, and (GND) terminals of the product
to the matching terminals on the switchboard.
In an emergency, turn off the switchboard breaker to disconnect the product from the AC power line.
Necessary Cable
• Vinyl cabtire cable (VCTF): Nominal cross-sectional area 5.5 mm2, 3 core
• Finished diameter: 10.5 to 14.4 mm in diameter
• Rated voltage: 250 V or higher
• Input terminal end: 14 mm of insulation stripped from conductor for the L and N wires.
Crimping terminal (round, M4) that fixes the cable insulation in place
for the GND wire.
• Length: 3 m or less
Switchboard Breaker Requirements
• Installation must be done in accordance with national wiring rules, such as NFPA 70 "NEC"
and CSA C22.1 "CEC".
• Rated current: 30 A (for safety, breakers whose rated current exceeds 30 A cannot be used)
• Do not power any other equipment from the switchboard breaker.
• Keep the breaker readily accessible at all times.
• Indicate that the breaker is dedicated for use with this product and that it is used to
disconnect the product from the AC power line.
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Figure 1. Switchboard Diagram
Connection Procedure
1. Check that the AC power line meets the nominal input rating of the product. The product
can receive a nominal line voltage in the range of 100 VAC to 240 VAC at 50 Hz or 60 Hz.
2. Check that the POWER switch is turned off.
3. Attach a crimping terminal to the GND wire.
Figure 2. Attaching the Crimping Terminal
4. Connect the power cord and the included INPUT terminal cover to the AC INPUT terminal
on the rear panel. Be sure to connect the AC INPUT L, N, and (GND) terminals correctly.
Pass the power cord through the INPUT terminal cover, and fix the cord in place using the
cable gland.
RMX-4125
Switchboard
N
L
N
L
Breaker indication example
For the
RMX-4125 only
30 A
Power cord
RMX-4125
dedicated breaker
Crimping terminal (round, M4)
When crimping the core wire, use a
crimping terminal and tool that can
also grip the insulation.
RMX Programmable Power Supplies Safety Information & Installation Guide |© National Instruments |5
Figure 3. Connecting the Power Cord
5. Attach an appropriate crimping terminal to the switchboard end of the power cord.
6. Turn off the switchboard breaker.
7. Connect the L, N, and (GND) wires of the power cord to the matching terminals on the
switchboard.
STRIP
-
GAUGE
14 mm
Correct Incorrect Incorrect
The stripped wire is
touching the chassis.
The wire strands are
touching the chassis.
INPUT terminal cover
INPUT terminal cover
INPUT terminal cover
AC INPUT terminal
L: Black or brown
N: White or blue
(GND)
Screw
: Green or green and yellow
Power cord
Power cord
Power cord
Screw
Use this screw to fix the
wire in place.
Screw M4
Remove the first
14 mm of the wire’s
covering, and then
insert the wire here.
AC INPUT terminal
Cable gland:
Turn left to unlock
Cable gland:
Turn right to lock
Cable gland: Supports wires from 10.5 to 14.4 mm in diameter
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Turning the Power On
Turning the POWER Switch On
Caution Risk of electric shock. Regardless of whether load cables are connected to
the output terminals, be sure to attach the OUTPUT terminal cover before turning the
POWER switch on.
Load Cables
Caution Risk of fire. Use load cables whose capacity is adequate for the RMX
programmable power supply’s rated output current. The output connector and its
surrounding area become hot. Use cables whose covers have heat resistance at 85 °C
and higher.
Caution Risk of electric shock. Use the cable which has higher withstanding voltage
than the specified insulation voltage of the product to secure the double insulation or
reinforced insulation.
Connecting to the Output Terminals
Caution Risk of electric shock. Turn the POWER switch off before you touch the
OUTPUT terminals. Even if you turn the output off or turn the POWER switch off,
if the bleeder on/off setting (CF11) is set to “OFF,” the voltage that was present when
the output was on will remain at the output terminals. Turn the bleeder circuit on
before you touch the output terminals. Regardless of whether load cables are
connected to the output terminals, be sure to attach the OUTPUT terminal cover
before turning the POWER switch on. Confirm that the voltage between any output
terminal and ground is lower than the isolation voltage of the RMX programmable
power supply.
Figure 4. RMX-4125 Output Terminal
- (negative) terminal + (positive) terminal
Chassis terminal
RMX Programmable Power Supplies Safety Information & Installation Guide |© National Instruments |7
1. Turn the POWER switch off. Check that there is no voltage across the output terminals.
2. Connect one end of the included chassis connection wire to the chassis terminal, and then
connect the other end of the wire to the negative or positive output terminal.
Note For safety reasons, connect one of the output terminals to the chassis terminal
unless your application requires the output terminals to be floating
Use the screw on the RMX to connect the wire to the chassis terminal. Use the screw on the
output terminal to connect the wire to the output terminal.
Figure 5. RMX-4120/4121/4124/4125
Figure 6. RMX-4122/4123/4126/4127
3. Attach crimping terminals to the load cables.
The output terminals have holes for connecting the load cables. Use crimping terminals that
are appropriate for the bolts that you are using.
4. Use the included bolt set to connect the load cables to the output terminals.
Connect the positive cable to the positive output terminal and the negative cable to the
negative output terminal. The orientation of the crimping terminals will vary depending on
the wire diameter of the load cables used.
Chassis
connection wire
Screw (M3) Screw (M4)
Chassis
connection wire
Screw (M3) Screw (M4)
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Figure 7. Connection Using M8 Bolt Set for RMX-4120/4121/4124/4125
Figure 8. Connection Using M5 Bolt Set for RMX-4122/4123/4126/4127
Note If you do not connect load cables in the correct orientation, you will not be
able to attach the OUTPUT terminal cover.
Spring washer
Washer
Nut
Bolt (M8)
Crimping terminal
Attach the cable to the inner side
of the crimping terminal.
Attach the cable to the outer side
of the crimping terminal.
Spring washer
Washer
Nut
Bolt (M5)
Screw (M4)
Crimping terminal
RMX Programmable Power Supplies Safety Information & Installation Guide |© National Instruments |9
Attaching the Output Terminal Cover
You can adjust the diameter of the holes that the load cables pass through by changing the
positions in which the top and bottom halves of the OUTPUT terminal cover are put together.
There are two available positions. Use the appropriate position for the load cables that you are
using.
• For cables that are up to 10 mm in diameter: Put the top and bottom halves of the OUTPUT
terminal cover together so that the hole diameter is small.
• For cables that are between 10 mm and 18 mm in diameter: Put the top and bottom halves
of the OUTPUT terminal cover together so that the hole diameter is large.
1. Remove the screw that is attached next to the output terminals on the RMX. Use this screw
to attach the OUTPUT terminal cover.
2. Place the bottom half of the OUTPUT terminal cover underneath the load cables connected
to the output terminals.
Figure 9. Attaching Bottom Half of the OUTPUT Terminal Cover
Note The top and bottom halves of the OUTPUT terminal cover have different
shapes.
3. Align the tabs of the top half of the OUTPUT terminal cover with those of the bottom half.
Align the tabs of the OUTPUT terminal cover according to the load cable diameter.
Remove the screws, and then
line up the half of the cover.
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Figure 10. Aligning Both Halves of the OUTPUT Terminal Cover
4. Push the OUTPUT terminal cover against the rear panel, and then use the RMX screws to
fix the cover in place. Ensure that the screws are securely fastened.
Figure 11. Attaching the OUTPUT Terminal Cover
Top half of the cove
Align the protrusion of
the top half of the cover
with the top section
of the protrusion of the
bottom half.
Bottom half of the cover
For thick load cables
Cover hole diameter:
10 mm to 18 mm
Cover hole diameter:
Up to 10 mm
For thin load cables
Top half of the cover
Align the protrusion of
the top half of the cover
with the middle section
of the protrusion of the
bottom half of the cover.
Bottom half of the cover
Middle
section
Top section
After you have lined up the top and bottom halves
of the cover, use the screws to fix the cover in place.
Screws (M3)
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