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

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

AC INPUT terminal

L: Black or brown

N: White or blue

(GND)

Screw

: Green or green and yellow

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

6|ni.com |RMX Programmable Power Supplies Safety Information & Installation Guide

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)

8|ni.com |RMX Programmable Power Supplies Safety Information & Installation Guide

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.

10 |ni.com |RMX Programmable Power Supplies Safety Information & Installation Guide

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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