National Instruments RMX-4120, RMX-4121, RMX-4123, RMX-4122, RMX-4124 Installation Manual
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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.
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, 2.5mm
plug configured for the country of use to C14.
2
, 3 Conductor cord, 3 m or less with a
• 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.
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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.
RMX Programmable Power Supplies Safety Information & Installation Guide | © National Instruments | 3
Figure 1. Switchboard Diagram
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.
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.
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Figure 3. Connecting the Power Cord
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
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.
RMX Programmable Power Supplies Safety Information & Installation Guide | © National Instruments | 5
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