nVent SCHROFF Rack Safety Plus 3 U User manual

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Rack Safety Plus, 3 U
Power Distribution Unit with Emergency Stop
User Manual
Release 1.0
07.03.2023
Doc-No: 63972-435

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Schroff GmbH
Langenalber Str. 96-100
75334 Straubenhardt/Germany
schroff.nVent.com
This document is furnished under license and may be used or copied only in accordance with the
terms of such license. The content of this manual is furnished for informational use only, is subject
to change without notice, and should not be construed as a commitment by nVent. nVent
assumes no responsibility or liability for any errors or inaccuracies that may appear in this
document.
Except as permitted by such license, no part of this publication may be reproduced, stored in a
retrieval system, or transmitted, in any form or by any means, electronic, manual, recording, or
otherwise, without the prior written permission of nVent.
All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All
other trademarks are the property of their respective owners. nVent reserves the right to change
specifications without notice.
Copyright © 2023 nVent
All Rights Reserved.

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Table of Contents
1. Safety................................................................................................................................5
1.1 Intended Use.................................................................................................................5
1.2 Not intended use...........................................................................................................5
1.3 Safety instructions of the manufacturer .........................................................................5
1.3.1 Disclaimer.................................................................................................................5
1.4 Safety symbols used in this manual ..............................................................................6
1.5 Safety Information for the Operator...............................................................................7
1.6 Safety assessment........................................................................................................7
2. Power Distribution Unit Overview ..................................................................................8
2.1 System description........................................................................................................8
2.2 Possible configuration options.......................................................................................8
2.2.1 Mains input...............................................................................................................8
2.2.2 AC outputs................................................................................................................9
2.2.3 DC outputs ...............................................................................................................9
2.2.4 AC Service Outputs (Permanently powered).............................................................9
2.3 Front and Rear View ...................................................................................................10
2.4 Example Configurations..............................................................................................11
2.5 Mains inlets.................................................................................................................12
2.6 AC Outlets...................................................................................................................14
2.7 DC Outlets (Option).....................................................................................................15
2.8 Circuit Breakers...........................................................................................................16
2.9 Surge Arrester (Option)...............................................................................................17
2.10 Inrush Current Limiter (Option)....................................................................................18
3. Emergency Stop System...............................................................................................19
3.1 Emergency Stop safety features .................................................................................19
3.2 Emergency Stop Input and Output ..............................................................................20
3.2.1 Emergency Stop Status LEDs ................................................................................20
4. Installation and Commissioning...................................................................................21
4.1 Installation...................................................................................................................21
4.2 Rack mounting............................................................................................................22

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4.3 Mains connection and system start-up........................................................................23
5. Maintenance...................................................................................................................24
5.1 Cleaning......................................................................................................................24
6. Disposal..........................................................................................................................24
7. Technical data................................................................................................................25
7.1 Dimensions.................................................................................................................26

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1. Safety
1.1 Intended Use
The nVent SCHROFF power distribution unit described in this manual is a power distribution
unit used to supply AC mains power to electrical or electronic devices as a central power
switch with emergency stop function.
Intended use includes compliance with the terms and conditions for assembly, disassembly,
commissioning, operation and maintenance specified by the manufacturer.
The power distribution unit is only intended for use in dry locations, i.e. indoors and without
any pollution, in an industrial environment or for commercial use.
1.2 Not intended use
The use of the power distribution unit as a safety function for a machine is not allowed and
can lead to hazards.
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired
1.3 Safety instructions of the manufacturer
1.3.1 Disclaimer
Schroff accepts no liability for any errors in this documentation. To the maximum extent
permissible by law, any liability for damage, direct or indirect, arising from the supply or use
of this documentation is excluded.
Schroff retains the right to modify this document, including the liability disclaimer, at any time
without notice and accepts no liability for any consequences of such alterations.

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1.4 Safety symbols used in this manual
In these original operating instructions, warning notices point out residual risks that cannot be
avoided by constructive means when installing or operating the Power Distribution Unit. The
warning notices are classified according to the severity of the damage occurring and the
probability of its occurrence.
⚠DANGER
Symbol
Short description of the danger
The signal word DANGER indicates an immediate danger.
Non-observance will result in severe injuries or death.
⚠WARNING
Symbol
Short description of the danger
The signal word WARNING indicates a possible danger.
Non-observance can lead to serious injury or death.
⚠CAUTION
Symbol
Short description of the danger
The signal word CAUTION indicates a possible danger.
Non-observance can lead to injuries.
ATTENTION
Short description
The signal word ATTENTION indicates possible damages to equipment.
Non-observance can lead to damage to the device.
Important information

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1.5 Safety Information for the Operator
Only trained specialists are authorized to carry out assembly, commissioning, completion,
maintenance and service of the power distribution unit. The nationally applicable health and
safety regulations must also be adhered to.
⚠WARNING
Risk of injury due to insufficient personal protective equipment
If you use the wrong protective equipment or no protective equipment at all,
you could be seriously injured.
- Wear protective equipment adapted to the work processes.
- Check the protective equipment before each use to ensure that it is intact!
- Use only approved protective equipment.
1.6 Safety assessment
Before using the power distribution unit in conjunction with a plant/machine, a safety
assessment in accordance with the Machinery Directive is required.
The products emergency stop feature is not intended to be used as a safety related function
for a machine. Therefore, the user must provide own measures to ensure the required
functional safety of the machine is achieved.

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2. Power Distribution Unit Overview
2.1 System description
The power distribution unit is intended to supply AC mains power and various DC power to
electrical or electronic devices as a central power switch with emergency stop function.
The power distribution unit has a modular design and can be configured by the customer.
Due to the modularity not all possible configurations can be described in this
manual.
For further technical information and configuration options, please refer to
the relevant data sheets and the online configurator at schroff.nvent.com.
Default features
•19” 3 U aluminium subrack
•Main ON/OFF by a 2-pole circuit breaker
•Circuit breaker panel
•Emergency stop system
•Status LEDs for phase presence and emergency stop
•ON/OFF button for switched outputs
2.2 Possible configuration options
2.2.1 Mains input
•120 V AC input, 12 A, 2.5 m cable with flying leads or NEMA Type 5-20P connector
•120 V AC input, 16 A, 2.5 m cable with flying leads or NEMA Type 5-20P connector
•120 V AC input, 24 A, 2.5 m cable with flying leads or NEMA Type L5-30P connector
•208 / 240 V AC input, 12 A, 2.5 m Cable with flying leads or NEMA Type 6-20P
connector
•208 / 240 V AC input, 16 A, 2.5 m Cable with flying leads or NEMA Type 6-20P
connector
•208 / 240 V AC input, 2430 A, 2.5 m Cable with flying leads or NEMA Type L6-30P
connector

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2.2.2 AC outputs
•For 120 V AC units 2 outlet panel are available:
4 x NEMA 5-15R (12 A) outlets
4 x NEMA 5-20R (16 A) outlets
•For 208 / 240 V AC units 4 outlet panel are available:
2 x block of 4 x C13 (12 A), non-lockable outlets
6 x C13 (12 A), lockable outlets
4 x C19 (16 A), lockable outlets
4 x C19 (16 A), non-lockable outlets
2.2.3 DC outputs
•5 different DC output panels are available:
24 V DC, 14.6 A
28 V DC, 14.6 A
24 V DC, 14.6 A & 5 V DC, 6.5 A
24 V DC, 14.6 A & 12 VDC, 4.5 A
24 V DC, 14.6 A & 5 V DC, 6.5 A & 12 V DC, 4.5 A
2.2.4 AC Service Outputs (Permanently powered)
•NEMA 5-15R (120 V AC), IEC 60320-C13 (208/240 V AC) at the front and/or the
rear panel
All outputs are protected by circuit breakers.
All outputs except the "Service" outputs can be switched off by the Emergency Stop system.

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2.3 Front and Rear View
(P/N 21272-001)
1
Line Monitor LED
8
“Service” Output 208/240 V AC 12 A (option)
2
Mains ON/OFF
9
24 V DC Output, switched (option)
3
Circuit Breakers
10
Configurable output panel 1
Example: Switched Power Outputs IEC-60320
C13, 208/240 V AC 12 A
4
Service Output 208/240 V AC 12 A
(option)
11
Configurable output panel 2
Example: Switched Power Outputs IEC-60320
C19, 208/240 V AC 16 A
5
Emergency Stop Push Button
12
Configurable input panel
Example: 2.5 m Cable w/ Nema L6 Plug 24 A
6
Emergency Stop Status LEDs
13
Emergency Stop Input and Status Output
7
ON/OFF Button for switched Outputs
14
Ground Stud

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2.4 Example Configurations
PN: 21272-001
PN: 21272-002

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2.5 Mains inlets
Different power inlet modules for 120 V AC and 208/240 V AC are available.
The 208 / 240 V AC input units handle different voltage inputs:
208/240 V AC Inputs
208/240 V AC 12 A cable 2.5 m
208/240 V AC 16 A cable 2.5 m
208/240 V AC 24 A cable 2.5 m
208/240 V AC 12 A
NEMA 6-20P
208/240 V AC 16 A
NEMA 6-20P
208/240 V AC 24 A
NEMA L6-30P

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120 V AC Inputs
120 V AC 12 A cable 2.5 m
120 V AC 16 A cable 2.5 m
120 V AC 24 A cable 2.5 m
120 V AC 12 A
NEMA 5-20P
120 V AC 16 A
NEMA 5-20P
120 V AC 24 A
NEMA L5-30P

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2.6 AC Outlets
Different power outlet modules for 120 V AC or 208/240 V AC are available.
The following overview represents the availability at the time of publication of this manual.
For the current availability visit schroff.nvent.com
Switched 208/240 V AC Outlets
IEC 60320-C13, 12 A
IEC 60320-C13 lockable, 12 A
IEC 60320-C19, 16 A
IEC 60320-C19 lockable, 16 A
Switched 120 V AC Outlets
NEMA 5-15R, 12 A
NEMA 5-20R, 16 A

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Permanent Service Outlets (Option)
Front
Front
Rear
Rear
NEMA 5-15R
IEC 60320-C13
NEMA 5-15R
IEC 60320-C13
2.7 DC Outlets (Option)
24 V DC, 14.6 A
28 V DC, 14.6 A
24 V DC, 14.6 A
5 V DC, 6.5 A
24 V DC, 14.6 A
12 V DC, 4.5 A
24 V DC, 14.6 A
5 V DC, 6.5 A
12 V DC, 4.5 A
The connector for 24/28 V is Phoenix Contact P/N: 1840557
The mating connector is Phoenix Contact P/N: 1828249
The connector for 5/12 V is Phoenix Contact P/N: 1096152
The mating connector is Phoenix Contact P/N: 1777989

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2.8 Circuit Breakers
The outputs are protected by circuit breakers (5). The number of the circuit breaker
corresponds to the number of the output, for example, X1 is connected to CB1, X2 is
connected to CB2 and so on.
ATTENTION
Electrical overload hazard
The total current consumption of all outputs must not exceed the current rating of the
mains input.
One pole circuit breakers for
120 V AC systems
Dual pole circuit breakers for 208/240 V AC systems

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2.9 Surge Arrester (Option)
The Power
Distribution Unit
can be equipped
with a surge
arrester as an
option.

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2.10 Inrush Current Limiter (Option)
The Power Distribution Unit provides an inrush current limiter as an option.
The inrush current limiter is designed for capacitive loads. In the moment of switching-on the
system the inrush current of the connected load will be limited for the defined time Ton.
Independent from the previous inrush level, the current limiting is always strict. After Ton
elapses the current limiting circuit of the inrush current limiter will be bypassed. Then the load
is directly connected to the AC. If an AC dump overshoots the defined time Toff, it will be
detected by the inrush current limiter. As soon as the AC recovers the inrush will be limited,
again. The inrush current limiter provides an internal temperature control. In case of a failure
the device shuts down to prevent overheating or fire.
For reliable operation of the optional inrush current limiter, a type B or C
circuit breaker in the electrical feed to the Rack Safety Plus Unit is required.
Faster circuit breakers are not recommended.

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3. Emergency Stop System
The device is equipped with an emergency stop
button (6).
Pressing the emergency stop button disconnects
the switched AC and DC outputs from the mains.
The button is mechanically latching. Emergency
stop is deactivated by pulling the button.
The switched AC and DC outputs can be turned on
again by pressing the Outputs ON button.
⚠DANGER
Danger of electric shock
The “Service” AC outputs are not switched off via the Emergency Stop
System.
3.1 Emergency Stop safety features
The Emergency Stop function of the nVent SCHROFF power distribution unit is controlled
and monitored by a safety relay.
The safety relay provides a safety-related interruption of the switched outputs. The safety
relay meets the requirements of EN 60947-5-1 and EN 60204-1 in applications with E-STOP
push buttons.
The emergency stop push button is vandalism-proof. If the emergency stop is sheared off
during operation, the emergency stop function is also triggered.
The safety relay meets the following safety requirements:
•The circuit is redundant with built-in self-monitoring.
•The safety function remains effective in the case of a component failure.
•The correct opening and closing of the safety function relays is tested automatically in
each on-off cycle.
•Two emergency stop input circuits with cross-circuit detection.
•Emergency stop function is triggered when either one of the two emergency stop
input circuits is interrupted or a cross-circuit between the circuits is detected.
The safety relay drives two power contactors responsible for switching the
outputs.
The power contractors are monitored by auxiliary contacts within a feedback
loop of the safety relay. In case of one power contactor failing by a stuck
contact the system can not be turned on again.
The red ERROR LED on front panel signals if one of the power contactors
got stuck

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3.2 Emergency Stop Input and Output
An additional emergency stop push button can be connected to the system at the
"Emergency Stop" input (14).
If no additional emergency stop push button is connected, the socket must be terminated
with a jumper plug. (Scope of delivery)
The "Emergency Status" connector can be used to transfer status signals to other devices.
The Emergency Status plug connector provides a relay output with the status of the safety
relay. If the AC and DC outputs are enabled, the relay output (pin 1+2) is closed. If the
emergency stop function is triggered, the safety relay interrupts the relay contact.
If the outputs are not enabled via the Output ON/OFF button, the relay output is permanently
open.
Emergency Stop (DSUB9)
Pin 1&6
Emergency stop input circuit 1
Pin 2&7
Emergency stop input circuit 2
Emergency Status (Lumberg KFV 40)
Pin 1&2
Relay output status safety relay
Max. voltage = 24 VDC or 24 VAC
Max. current = 4 A
3.2.1 Emergency Stop Status LEDs
The emergency stop system is powered by a
dedicated power supply. The presence of the
supply voltage for the emergency stop system
is signaled by the green “Power”LED.
The red “Error” LED signals if one of the power
contactors got stuck.