APPLICATION NOTE. Guidelines For Extending Power Supplies. Figure 1

APPLICATION NOTE

Guidelines For Extending Power Supplies

Application Description: In a typical integrated operating room surgical displays are suspended from the ceiling using surgical boom arms so they can be easily positioned as needed around the surgical table. It is not possible to safely route a high voltage AC power line through most surgical boom systems.

For this reason, the low voltage DC output of the display’s power supply is typically extended and routed through the boom arm and the power supply is installed either in the ceiling or in a equipment rack nearby (see figure 1 below). In order to ensure both electrical safety compliance* and proper operation of the display it is important to follow certain guidelines when extending the power supply’s DC output cable. This application note is intended to provide guidelines that may be referred to when fabricating a DC extension cable for an NDS surgical display. Installation, electrical connections, maintenance, and commissioning should be performed by qualified personnel only. NDS shall assume no liability for damages resulting from faulty installation, operation, improper use or maintenance.

Figure 1

Power Supply DC Extension Cable Length NDS Surgical Display DC Power Extension Cable Surgical Boom Arm

Construction of DC Extension Cable: A DC extension cable for an NDS display should have certain basic construction characteristics. It should be constructed using connectors of the same type and rating as the display and power supply it is intended to be used with. Both the positive DC power lines and the return lines should have equivalent resistance. Permitted that the display’s earth ground electrical path is no greater than 0.1 ohms (typically achieved by grounding the display’s earth ground post), then the DC extension cable can consist of only the positive DC power and the return lines (no earth ground required).

APPLICATION NOTE

Guidelines For Extending Power Supplies

Page 2 of 5

Overview of Connectors:

Below is an overview of the two different types of connectors used for extending power to NDS displays., including their corresponding pin assignments. Please refer to the table on page 4 for the connectors to be used for specific displays.

© Copyright 2019, NDS Surgical Imaging

Exploded Photo Mechanical Drawing Pin Assignment Solder Cup

Capacity Neutrik XLR

3-Pin Male Connector NC3MX

Pin Signal Max AWG

1 Ground 14 AWG 2 Ground 3 +24 VDC Neutrik XLR 3-Pin Female Connector NC3FX

Pin Signal Max AWG

1 Ground 14 AWG 2 Ground 3 +24 VDC Switchcraft 3-Pin Male Connector SL413MX

Pin Signal Max AWG

1 +24 VDC 22 AWG 2 Ground 3 Ground Switchcraft 3-Pin Female Connector SL403FX

Pin Signal Max AWG

1 +24 VDC 22 AWG 2 Ground 3 Ground Slidethe bootonto thecable. Insert wires into the terminals and solder them. Putchuck ontothe cable. Slide insert and chuck together into the housing. Finishthe installationby turningthe bushing ontothe connector. Preparecable asshown. Attention:Pay attentionto theguiding key. A B C E F D A B C D 18 4 E F ORDEROF ASSEMBLY NC FXX  bu sh in g ch uc k in se rt ho us in g NC MXX 

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NEUTRIK AG NEUTRIK ZürichAG NEUTRIK USAInc. NEUTRIK UK Ltd . T : F: T : F: T : F: ( ) T : F: LI CH USA UK +423/ 23724 24 +423/ 23253 93 +4144 /736 5010 +4144 /736 5011 +1732 /901 9488 +1732 /901 9608 +441983 /81 1441 +441983 /81 1439 Draft. Nr.: BDA158 Update: 12..03.2008 I /3102M1381 I Data subjectto changewithout priornotice. 2008NEUTRIK .ALL RIGHTSRESER VED. ® © NEUTRIK NEUTRIKF rance NEUTRIKT okyoLt d. NEUTRIK Vertriebs GmbH T : F: T : F: T : F: Ltd . T : F: DE /N L/ AT FR JP HK +498131 /280 890 +498131 /280 830 +331 /4131 6750 +331 /4131 0511 +813 /3663 4733 +813 /3663 4796 +852/ 26876055 +852/ 26876052 HongKong ww w.n eu tr ik .c om NEUTRIK AG NEUTRIK ZürichAG NEUTRIK USAInc. NEUTRIK UK Ltd . T : F: T : F: T : F: ( ) T : F: LI CH USA UK +423/ 23724 24 +423/ 23253 93 +4144 /736 5010 +4144 /736 5011 +1732 /901 9488 +1732 /901 9608 +441983 /81 1441 +441983 /81 1439 Draft. Nr.: BDA158 Update: 12..03.2008 I /3102M1381 I Data subjectto changewithout priornotice. 2008NEUTRIK .ALL RIGHTSRESER VED. ® © NEUTRIK NEUTRIKF rance NEUTRIKT okyoLt d. NEUTRIK Vertriebs GmbH T : F: T : F: T : F: Ltd . T : F: DE /N L/ AT FR JP HK +498131 /280 890 +498131 /280 830 +331 /4131 6750 +331 /4131 0511 +813 /3663 4733 +813 /3663 4796 +852/ 26876055 +852/ 26876052 HongKong ww w.n eu tr ik .c om Slidethe bootonto thecable. Insert wires into the terminals and solder them. Putchuck ontothe cable. Slide insert and chuck together into the housing. Finishthe installationby turningthe bushing ontothe connector. Preparecable asshown. Attention:Pay attentionto theguiding key. A B C E F D A B C D 18 4 E F ORDEROF ASSEMBLY NC FXX  bu sh in g ch uc k in se rt ho us in g NC MXX 

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NEUTRIK AG NEUTRIK ZürichAG NEUTRIK USAInc. NEUTRIK UK Ltd . T : F: T : F: T : F: ( ) T : F: LI CH USA UK +423/ 23724 24 +423/ 23253 93 +4144 /736 5010 +4144 /736 5011 +1732 /901 9488 +1732 /901 9608 +441983 /81 1441 +441983 /81 1439 Draft. Nr.: BDA158 Update: 12..03.2008 I /3102M1381 I Data subjectto changewithout priornotice. 2008NEUTRIK .ALL RIGHTSRESER VED. ® © NEUTRIK NEUTRIKF rance NEUTRIKT okyoLt d. NEUTRIK Vertriebs GmbH T : F: T : F: T : F: Ltd . T : F: DE /N L/ AT FR JP HK +498131 /280 890 +498131 /280 830 +331 /4131 6750 +331 /4131 0511 +813 /3663 4733 +813 /3663 4796 +852/ 26876055 +852/ 26876052 HongKong ww w.n eu tr ik .c om NEUTRIK AG NEUTRIK ZürichAG NEUTRIK USAInc. NEUTRIK UK Ltd . T : F: T : F: T : F: ( ) T : F: LI CH USA UK +423/ 23724 24 +423/ 23253 93 +4144 /736 5010 +4144 /736 5011 +1732 /901 9488 +1732 /901 9608 +441983 /81 1441 +441983 /81 1439 Draft. Nr.: BDA158 Update: 12..03.2008 I /3102M1381 I Data subjectto changewithout priornotice. 2008NEUTRIK .ALL RIGHTSRESER VED. ® © NEUTRIK NEUTRIKF rance NEUTRIKT okyoLt d. NEUTRIK Vertriebs GmbH T : F: T : F: T : F: Ltd . T : F: DE /N L/ AT FR JP HK +498131 /280 890 +498131 /280 830 +331 /4131 6750 +331 /4131 0511 +813 /3663 4733 +813 /3663 4796 +852/ 26876055 +852/ 26876052 HongKong ww w.n eu tr ik .c om Male Connector Female Connector +24V DC - Return +24V DC - Return Power Supply Display

Example of Extension Cable Construction

APPLICATION NOTE

Guidelines For Extending Power Supplies

Calculating Maximum Extension Cable Length:

The maximum length of an extension cable depends

upon both the minimum input voltage of the display and the electrical current capacity of the power

supply. The cable cannot be so long that the voltage drops below the display’s minimum operating voltage.

The cable must also not dissipate power to the point where the power supply’s electrical current capacity

is exceeded. The maximum allowable length needs to be calculated for each of these two requirements.

The shorter length should not be exceeded to ensure both requirements are met.

Operating Voltage:

The following equation can be used to calculate the maximum extension cable

length, L

_max

, that will still provide adequate operating voltage to the display while under load:

Where:

L

_max

(ft) = Maximum Cable Length

r

_cable

(Ω/ft) = Cable Resistance Per Foot

V

_ps

(Volts) = Power Supply Output Voltage

(V

_ps

– V

_{display min}

) V

_{display min}

2 x P

_display

x r

_cable

L

_max

=

For the NDS display being installed, determine the values for

V

_ps

, V

_{display min}

,

and

P

_display

using the information

contained in the table provided on the following page.

Determine the value of r

_cable

based upon the type

of wire being used. Plug in all values into the equation above to calculate the maximum length based on

the voltage requirement.

Power Dissipation:

The following equation can be used to calculate the maximum extension cable length

L

_max

that will ensure that the amount of power dissipated through the extension cable will not exceed the

current capacity of the power supply:

By solving for L

_max

this becomes:

(V

_ps

– V

_{display min}

) = (P

_display

/ V

_{display min}

) x (2 x L

_max

x r

_cable

)

By solving for L

_max

this becomes:

P

_display

+ (2 x r

_cable

x L

_max

x P

_ps

)

P

_ps

=

V

_ps

V

_ps

[V

_ps

–

(

V

ps

x P

display

]

)

P

_ps

L

_max

=

2 x r

_cable

x P

_ps

For the NDS display being installed, determine the values for

V

_ps

, P

_ps

,

and

P

_display

using the information

contained in the table provided on the following page.

Determine the value of r

_cable

based upon the type

of wire being used. Plug in all values into the equation above to calculate the maximum allowable length

based upon power dissipation.

V

_{display min}

(Volts) = Minimum Operating Voltage of Display

P

_display

(Watts) = Display Power Consumption (Max)

APPLICATION NOTE

Guidelines For Extending Power Supplies

Page 4 of 5

© Copyright 2019, NDS Surgical Imaging

Installation Verification:

Power extension cables can be designed and fabricated based upon calculated theoretical values. However, it is highly recommended that measurements be taken after installation is complete to verify that the minimum voltage specifications are being met. The voltage delivered to the display after extending the power supply must be measured while the power supply is under its maximum load which occurs at the moment the startup screen is displayed during initial power up.

The following procedural guidelines are recommended for correctly measuring the input voltage under load: 1. Without disconnecting the power to the display, gain access to the power electrical connections within close

proximity to the monitor’s power input connector. This can be done by sliding back the connector shell of the power connector that plugs into the monitor, or by using a special “Y-cable”. Refer to illustrations below and page 2 for Y-cable part numbers.

2. Connect the leads of a volt meter to the +24VDC and ground connections of the monitor’s power input (refer to pin assignments on page 2 or measurement point on Y-Cable below).

3. With the volt meter connected, power on the monitor using the power switch.

4. Observe the voltage reading as the monitor powers on. Immediately after the startup screen is displayed, the reading should fall to a lower value. Please note, in some circumstances the lowest value may only occur for a fraction of a second.

5. Record the lowest reading measured after the moment the startup screen is displayed as the monitor powers on. Compare it to the minimum voltage specification in the reference table provided on page 5 for the NDS display being used. If below the minimum value, adjust the extension cable length or construction as necessary.

Startup Screen Displayed

Connecting Leads of Volt Meter

to Power Connection

Power Supply Display Y-Cable Measurement Point

Y-Cable Diagram

Extension Cable

APPLICATION NOTE

Guidelines For Extending Power Supplies

© 2019 NDS Surgical Imaging, LLC. All rights reserved. Information in this document has been provided for reference purposes only. For complete technical and safety specifications, please refer to the product User Manual. This document is subject to change without notice. This document contains proprietary information protected by copyright. No part of this documentation may be reproduced by any mechanical, electronic, or other means, in any

Reference Table :The table provided below specifies the minimum operating voltage (under load), maximum power

consumption, and power supply capacity for various NDS displays. Also provided are example maximum extension cable lengths that will meet the requirements of each display when constructed using the standard wire types specified in the table. This table is provided for reference only. Note: these are theoretical values, adjustments may be required based upon environmental conditions and other factors.

Product Name, Size, and Revision Standard Display

Part Numbers Vdisplay min Pdisplay Pps

Power Connectors Used Max. Length Using Belden 8723 Max. Length Using Belden 8489 Max. Length Using Belden 8620

15” EndoVue® (Rev C and below) 90R0007 11.4 Volts 50 W 90 W SL413MX & SL403FX 193.5 ft 452.9 ft 646.5 ft

15” EndoVue® (Rev D and above) 90R0007 11.4 Volts 50 W 120 W SL413MX & SL403FX 190.5 ft 445.9 ft 636.4 ft

15” EndoVue® HD 90K0005 11.4 Volts 40 W 120 W SL413MX & SL403FX 217.7 ft 509.6 ft 727.3 ft

19” EndoVue® 90R0004 10.8 Volts 60 W 90 W SL413MX & SL403FX 145.1 ft 339.7 ft 484.8 ft

19” EndoVue® HD 90K0006 10.8 Volts 60 W 120 W SL413MX & SL403FX 161.6 ft 378.3 ft 540.0 ft

24” EndoVue® HD 90K0001, 90K0004 22.0 Volts 90 W 120 W SL413MX & SL403FX 33.3 ft 77.8 ft 111.1 ft

24” EndoVue® (LED Backlight) 90K0010, 90K0011, 90K0065, _90K0065 10.8 Volts 49 W 120 W SL413MX & SL403FX 95.3 ft 226 ft 324 ft

19” Radiance® (Rev J and below) 90R0001 10.8 Volts 60 W 90 W SL413MX & SL403FX 145.1 ft 339.7 ft 484.8 ft

19” Radiance® (Rev K and above) 90R0001 10.8 Volts 60 W 120 W SL413MX & SL403FX 161.6 ft 378.3 ft 540.0 ft

19” Radiance® HD 90R0015 10.8 Volts 60 W 90 W SL413MX & SL403FX 145.1 ft 339.7 ft 484.8 ft

19” Radiance® Full MMI 90R0035, 90R0060 10.8 Volts 65 W 120 W SL413MX & SL403FX 149.2 ft 349.2 ft 498.5 ft

23” Radiance® HD 90R0013, 90R0014, 90R0018, _90R0021 22.0 Volts 80 W 120 W SL413MX & SL403FX 37.4 ft 87.6 ft 125.0 ft

24” Radiance® Full MMI 90R0019, 90R0022, 90R0037, _{90R0038, 90R0058} 22.0 Volts 115 W 120 W SL413MX & SL403FX 13.6 ft 31.8 ft 45.5 ft

24” Radiance® G2 90R0063, 90R0064, 90R0067 22.8 Volts 50 W 120 W SL413MX & SL403FX 16.5 ft 39.4 ft 56.5 ft

26” Radiance® HD 90R0020, 90R0023 22.0 Volts 115 W 120 W SL413MX & SL403FX 13.6 ft 31.8 ft 45.5 ft

26” Radiance® Full MMI 90R0029, 90R0030 22.0 Volts 115 W 120 W SL413MX & SL403FX 13.6 ft 31.8 ft 45.5 ft

26” Radiance® G2 90R0050, 90R0051, 90R0061 22.8 Volts 60 W 120 W SL413MX & SL403FX 31.0 ft 72.6 ft 103.6 ft

26” Radiance® G2 HB 90R0052, 90R0053, 90R0062 22.5 Volts 95 W 150 W NC3MX & NC3FX 24.2 ft 56.6 ft 80.7 ft

27” Radiance Ultra 90R0100, 90R0102, 90R0104, _90R0126 22.0 Volts 70 W 150 W NC3MX & NC3FX 38 ft 91 ft 131 ft

32” Radiance® 90R0005 22.8 Volts 110 W 120 W SL413MX & SL403FX 16.9 ft 39.6 ft 56.5 ft

32” Radiance® Full MMI 90R0033, 90R0034, 90R0059 22.8 Volts 130 W 150 W NC3MX & NC3FX 14.3 ft 33.5 ft 47.8 ft

32” Radiance® G2 90R0076, 90R0077, 90R0078 22.8 Volts 60 W 150 W NC3MX & NC3FX 27 ft 64 ft 92 ft

32” Radiance Ultra 90R0106, 90R0107, 90R0108, _90R0127 21.6V 52W 150 W NC3MX & NC3FX 63 ft 150 ft 215 ft

32” Radiance Ultra TruColor 90R0112, 90R0113, 90R0114, _90R0128 21.6V 87W 150 W NC3MX & NC3FX 36 ft 86 ft 124 ft

32” Radiance Ultra 4K/UHD 90R0116, 90R0123, 90R0124 21.6V 130W 150 W NC3MX & NC3FX 23 ft 55 ft 79 ft

32” Radiance Ultra 4K/UHD 3D 90R0124, 90R0129, 90R0131 21.6V 130W 150 W NC3MX & NC3FX 23 ft 55 ft 79 ft

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