hopf Elektronik GmbH 8030HEPTA/NCD User manual

_____________________________________________________________
Technical Manual
Network Clock Device
Model 8030HEPTA/NCD
ENGLISH
Version: 04.00 - 21.06.2018
_____________________________________________________________
SET
IMAGE (8030)
FIRMWARE
Valid for
Version: 04.xx
Version: 04.xx
Version: 02.xx
Industriefunkuhren

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hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]

INPORTANT NOTES
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hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]
Version number (Firmware / Manual)
THE FIRST TWO DIGITS OF THE VERSION NUMBER OF THE TECHNICAL MANUAL AND
THE FIRST TWO DIGITS OF THE FIRMWARE VERSION MUST COMPLY WITH EACH OTHER.
THEY INDICATE THE FUNCTIONAL CORRELATION BETWEEN DEVICE AND TECHNICAL
MANUAL.
THE DIGITS AFTER THE POINT IN THE VERSION NUMBER INDICATE CORRECTIONS IN THE
FIRMWARE /MANUAL THAT ARE OF NO SIGNIFICANCE FOR THE FUNCTION.
Downloading Technical Manuals
All current manuals of our products are available free of charge via our homepage on the
Internet.
Homepage: http://www.hopf.com
E-mail: [email protected]
Symbols and Characters
Operational Reliability
Disregard may cause damages to persons or material.
Functionality
Disregard may impact function of system/device.
Information
Notes and Information.

INPORTANT NOTES
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hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]
Safety regulations
The safety regulations and observance of the technical data serve to en-
sure trouble-free operation of the device and protection of persons and
material. It is therefore of utmost importance to observe and compliance
with these regulations.
If these are not complied with, then no claims may be made under the
terms of the warranty. No liability will be assumed for any ensuing dam-
age.
Safety of the device
This device has been manufactured in accordance with the latest techno-
logical standards and approved safety regulations
The device should only be put into operation by trained and qualified staff.
Care must be taken that all cable connections are laid and fixed in position
correctly. The device should only be operated with the voltage supply in-
dicated on the identification label.
The device should only be operated by qualified staff or employees who
have received specific instruction.
If a device must be opened for repair, this should only be carried out by
employees with appropriate qualifications or by hopf Elektronik GmbH.
Before a device is opened or a fuse is changed all power supplies must
be disconnected.
If there are reasons to believe that the operational safety can no longer
be guaranteed the device must be taken out of service and labelled ac-
cordingly.
The safety may be impaired when the device does not operate properly
or if it is obviously damaged.
CE-Conformity
This device fulfils the requirements of the EU directive 2014/30/EU "Electro-
magnetic Compatibility" and 2014/35/EU "Low Voltage Equipment".
Therefore the device bears the CE identification marking
(CE = Communautés Européennes = European communities)
The CE indicates to the controlling bodies that the product complies with the requirements of
the EU directive - especially with regard to protection of health and safety for the operator and
the user - and may be released for sale within the common markets.

TABLE OF CONTENTS
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hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]
Contents Page
1Network Clock Device 8030HEPTA/NCD.....................................................................7
2System Structure........................................................................................................10
2.1 19 inch Rack 1U/84HP (Slim Line) ..........................................................................11
2.2 Functional Overview of the Front Panel Elements ...................................................11
2.2.1 LCD-Display with Pushbutton ............................................................................................ 11
2.2.2 Status-LEDs –System (& Extension)................................................................................ 12
2.2.3 Functional Elements Rear Side ......................................................................................... 13
2.2.4 Extension Modules 1 - 6 (Option) ...................................................................................... 13
3Function Principle.......................................................................................................14
3.1 Block Diagram.........................................................................................................14
3.2 Function 8030NTC ..................................................................................................15
3.3 Function 8030NTS/M...............................................................................................15
3.4 LCD-Display with Pushbutton..................................................................................15
3.5 System EXTENSION 1 - 8 (Option).........................................................................16
4System Behaviour.......................................................................................................17
4.1 Boot Phase..............................................................................................................17
4.2 Adjustment Process.................................................................................................17
4.3 Firmware-Update.....................................................................................................17
4.4 Activation of Functions (Activation Key)...................................................................17
5Installation...................................................................................................................18
5.1 Network Clock Device 8030HEPTA/NCD in 1U Housing.........................................18
5.1.1 Installation of the 19 Inch Rack.......................................................................................... 18
5.1.2 Earthing.............................................................................................................................. 18
5.1.3 AC Power Supply............................................................................................................... 18
5.1.3.1 Safety and Warning Instructions................................................................................................. 19
5.1.3.2 Power Supply Unit Specifications............................................................................................... 19
5.1.3.3 Fusing......................................................................................................................................... 19
5.1.4 DC Power Supply (Option)................................................................................................. 20
5.1.4.1 Power Supply Unit Specifications............................................................................................... 20
5.1.4.2 Fusing......................................................................................................................................... 20
5.1.4.3 Reverse Voltage Protection........................................................................................................ 20
5.2 Connection LAN Interface ETH0/ETH1....................................................................21
6Commissioning...........................................................................................................22
6.1 Switching the Operating Voltage on.........................................................................22
6.2 LCD-Display after Switch On / Reset (Boot Phase) .................................................22
6.3 Establish the Network Connection via Web Browser ...............................................23
6.4 Network Configuration for ETH0 via LAN through hmc software............................23
7LCD-Display with Pushbutton –Function.................................................................26

TABLE OF CONTENTS
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hopf Elektronik GmbH
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7.1 Pushbutton Function (Light / Scroll).........................................................................26
7.2 Standard Display Image..........................................................................................26
7.2.1 Standard Display Image without valid Time....................................................................... 26
7.2.2 Standard Display Image with valid Time............................................................................ 27
7.2.3 Standard Display with Additional Information .................................................................... 28
7.3 GENERAL ERROR .................................................................................................28
7.4 LAN Parameter........................................................................................................29
7.5 Local Time Parameter.............................................................................................30
7.6 Announcements (Summertime / Leap Second) .......................................................30
7.7 System-Info.............................................................................................................31
8HTTP/HTTPS WebGUI –Web Browser Configuration Interface...............................31
9SSH and Telnet Basic Configuration.........................................................................32
10 Fault Analysis / Troubleshooting...............................................................................33
10.1 Error Patterns..........................................................................................................33
10.1.1 Complete Failure................................................................................................................ 33
10.2 Support by Company hopf .....................................................................................33
11 Maintenance................................................................................................................34
11.1 General Guidelines for Cleaning..............................................................................34
11.2 Cleaning the Housing..............................................................................................34
11.3 Cleaning the Display and Front Panel......................................................................34
12 Technical Data ............................................................................................................35
12.1 General –8030HEPTA/NCD...................................................................................35
13 Factory Defaults of Time Server 8030HEPTA/NCD...................................................37
14 Glossary and Abbreviations ......................................................................................37
14.1 NTP-specific Terminology........................................................................................37
14.2 Abbreviations...........................................................................................................38
14.3 Definitions ...............................................................................................................39
14.3.1 DHCP (Dynamic Host Configuration Protocol) .................................................................. 39
14.3.2 NTP (Network Time Protocol)............................................................................................ 39
14.3.3 SNMP (Simple Network Management Protocol)................................................................ 40
14.3.4 TCP/IP (Transmission Control Protocol / Internet Protocol) .............................................. 40
14.3.5 PTP (Precision Time Protocol)........................................................................................... 40
14.4 Accuracy & NTP Basic Principles............................................................................41
15 List of RFCs.................................................................................................................43
16 List of Open Source Packages Used.........................................................................43

NETWORK CLOCK DEVICE 8030HEPTA/NCD
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hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]
1 Network Clock Device 8030HEPTA/NCD
The Network Clock Device 8030HEPTA/NCD consists of a Network Time Client 8030NTC and
a Network Time Server 8030NTS/M. Module 8030NTC acts as time source for the application,
module 8030NTS/M as NTP Stratum 1 Server or as PTP Grandmaster.
Module 8030NTC supports the following network protocols as synchronization source:
•NTP (incl. SNTP)
•IEEE 1588 Precision Time Protocol (PTP) (Activation Key required)
Module 8030NTS/M can output the following network protocols:
•NTP (incl. SNTP)
•Daytime
•Time
•SINEC H1 time datagram (Activation Key necessary)
•IEEE 1588 Precision Time Protocol (PTP) (Activation Key necessary)
Front Side
Rear Side
The Network Clock Device 8030HEPTA/NCD is integrated into a 1U/84HP 19" rack and char-
acterized by its easy and simple operation. Some of these practice-oriented functionalities are
e.g.:
•Complete parameterisation via protected WebGUI access
All required settings for operation can be executed via a password protected WebGUI.
•LCD-Display and Status-LEDs in the front panel
The LCD-Display and the Status-LEDs make rapidly and easily substantial information
for commissioning, on the operating status and for support matters available if a prob-
lem occurs, even without WebGUI access.
•Automatic switch-over of summer/winter time (initial setting required)
After initial commissioning there is no user intervention for a correct summer/winter
time changeover for the following years required.
•Automatic handling of the leap second
In case of announcing a leap second via the sync source of Network Clock Device
8030NTS/NCD, this leap second will automatically be inserted.
•Customized extensions possible
The new designed housing concept allows customized system extensions for addi-
tional signal outputs (processed ex-works) easily and fast.

NETWORK CLOCK DEVICE 8030HEPTA/NCD
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hopf Elektronik GmbH
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A superior security is guaranteed via available coding procedures such as symmetric keys,
autokey and access restrictions and deactivation of non-used protocols.
Different Management and Monitoring Functions are available as options (e.g. SNMP,
SNMP-Traps, E-mail notification, Syslog-messages including MIB II and private Enterprise
MIB).
A few other basic functions of the Network Clock Device 8030HEPTA/NCD:
•Operates as NTP Server with Stratum 1 or as PTP Grandmaster
•Easy operation via WebGUI
•LCD-Display (2x40) and Status LEDs on the front panel
•Completely maintenance-free system
•Maintenance-free, buffered backup clock for at least three days
Software supplied:
• hmc ( hopf Management Console) Software
Overview of the functions of the Network Clock Device 8030HEPTA/NCD:
Two Ethernet Interfaces
•Auto negotiate
•10 Mbps half-/full duplex
•100 Mbps half-/full duplex
•1 Gbps full duplex
Time Protocols
•RFC-5905 NTPv4 Server
oNTP Broadcast Mode
oNTP Multicast Mode
oNTP Client for additional NTP Servers (redundancy)
oSNTP Server
oNTP Symmetric Key Encryption
oNTP Autokey Encryption
oNTP Access Restrictions
•SINEC H1 time datagram (Activation Key necessary)
•RFC-867 DAYTIME Server
•RFC-868 TIME Server
•Precision Time Protocol (PTP) according to IEEE Std 1588™-2008 (Activation Key
necessary)
oIEEE Standard Profile for Use of IEEE 1588™ Precision Time Protocol
in Power System Applications (Power Profile) according
to IEEE Std C37.238™-2011

NETWORK CLOCK DEVICE 8030HEPTA/NCD
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hopf Elektronik GmbH
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Network Configuration (Activation Key necessary)
•Routing
•Bonding (NIC Teaming) Link aggregation according to IEEE 802.1ad
•VLAN support according to IEEE 802.1q
•PRP (Parallel Redundancy Protocol) according to IEC62439-3
System Management (Activation Key necessary)
•E-mail notification
•Syslog messages to external syslog server
•SNMPv2c/v3, SNMP Traps (MIB II, Private Enterprise MIB)
Configuration Channel
•HTTP/HTTPS WebGUI (browser-based)
•Telnet
•SSH
•External LAN configuration tool ( hmc –Network-Configuration-Assistant)
Additional Features
•Firmware Update via TCP/IP
•Fail-safe
•Watchdog circuit
•Customizable security banner
•NTP local time support

SYSTEM STRUCTURE
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hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]
2 System Structure
The Network Clock Device 8030HEPTA/NCD consists of the following:
•1/1 19" module rack 1U/84HP (Slim Line)
•System front panel with LCD-Display (2x40), pushbutton and status LEDs
System front view:
•Wide-ranging power supply unit from 100-240V AC / 20VA (Standard)
or 40VA (47-63Hz). Other input voltages available
•Voltage feed with power switch with connections in accordance with
IEC/EN60320/C14 including EMI line filter
•Connection for protection earth (PE) cables up to 16mm²
•Module 8030NTC
•Module 8030NTS/M
•Space for up to 8 additional output modules depending on system structure
System rear side:
The new designed housing concept allows customized system extensions for additional signal
outputs (processed ex-works) easily and fast.

SYSTEM STRUCTURE
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hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]
2.1 19 inch Rack 1U/84HP (Slim Line)
2.2 Functional Overview of the Front Panel Elements
This chapter describes the individual function elements of the front and rear panel.
2.2.1 LCD-Display with Pushbutton
The background illumination of the LCD-Display is activated or rather controlled by the
pushbutton Light/Scroll.
The 2x40 LCD-Display enables reading out the time and further essential information for the
commissioning, the operation status, and for support even without WebGUI access.
The operation and function of the pushbutton and the display are described in Chapter 7 LCD-
Display with Pushbutton –Function.

SYSTEM STRUCTURE
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hopf Elektronik GmbH
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2.2.2 Status-LEDs –System (& Extension)
The Status LEDs on the front panel indicate the current synchronization and operation status
of the Network Clock Device 8030HEPTA/NCD. Meanings of the LEDs are the following:
During the boot process, all LEDs are flashing in a test sequence.
System - Sync
Status LEDs
Green
Red
Sync-Status
Status Code
ON
Off
Sync (radio-synchronous) with quartz regulation
SYNC
Flashes
Off
Sync (radio-synchronous) - SyncOFF timer running
SYOF
ON
Flashes
Sync (radio-synchronous) - simulation mode
SYSI
Flashes
Flashes
Quarz - SyncON timer running
QUON
ON
ON
Quarz - time was set via synchronization source
QUEX
Flashes
ON
Quarz - time set manually or after reset
QUSE
Off
ON
No valid time
INVA
Off
Off
No operating voltage / faulty
---
System - NTC
Status LEDs
NTP-Status
Green
Red
NTP Service
STRATUM
ACCURACY
Off
On
Not Active
---
Low
Flashes 1Hz 50%
On
Active
16
Low
Flashes 1Hz 10%
Off
Active
1-15
Low
Flashes 1Hz 50%
Off
Active
1-15
Medium
On
Off
Active
1-15
High

SYSTEM STRUCTURE
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2.2.3 Functional Elements Rear Side
The rear side parts of modules 8030NTC and 8030NTS/M can be found in the individual mod-
ule manuals.
2.2.4 Extension Modules 1 - 6 (Option)
All installed system extensions deviating from the standard system 8030HEPTA/NCD includ-
ing the pertinent Status LEDs are documented and described in a device-specific supplemen-
tary instruction.

FUNCTION PRINCIPLE
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3 Function Principle
This chapter describes the function principle of the Network Clock Device 8030HEPTA/NCD
and the internal relations between the different functional groups.
3.1 Block Diagram
•Time Information
Module 8030NTC provides the time information as well as the particular synchroniza-
tion status to Module 8030NTS/M. With this time and status information the NTP ser-
vice running on Module 8030NTS/M and if necessary further signal generations and
network protocols are going to be synchronized.

FUNCTION PRINCIPLE
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3.2 Function 8030NTC
Module 8030NTC is the "heart" of Network Clock Device 8030HEPTA/NCD. The complete
LINUX operating system which provides all functions (e.g. NTP, Web-GUI etc.) runs on this
module. By means of the chosen network time protocol (NTP or PTP) the module-internal
crystal will be adjusted, thus a highly-precise time base for Module 8030NTS/M and, if neces-
sary, further signal generations created.
3.3 Function 8030NTS/M
Module 8030NTS/M acts as network time server. A complete LINUX operating system which
provides all functions (e.g. NTP, Web-GUI etc.) runs on this module. Module 8030NTS/M will
be adjusted by the time information provided by Module 8030NTC and provides this time in-
formation to all activated network time services.
3.4 LCD-Display with Pushbutton
System settings cannot be changed via the pushbutton nor the display. The display allows the
readout of important system and operation parameters directly at the device, even without
WebGUI access.
Update of the data in both the display and the WebGUI is subject to specific refreshing cycles.
The display indicates if the refreshing cycle is not completed yet.

FUNCTION PRINCIPLE
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hopf Elektronik GmbH
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3.5 System EXTENSION 1 - 8 (Option)
Network Clock Device 8030HEPTA/NCD can be expanded with additional modules ex works.
Therefore four extension slots are available.
Each extension slot can either be equipped with one NTP time server module 8030NTS/M
(each with two GigaBit LAN interfaces) or max. two output modules.
Additionally implemented NTP time server modules 8030NTS/M are mutually independent and
are going to be parameterized via their WebGUI. The operating status of each module
8030NTS/M will be displayed via 2 status LEDs on the front panel which are assigned to the
particular module 8030NTS/M via the related EXTENSION number. If the application is exclu-
sively equipped with modules 8030NTS/M, max. 4 mutually independent modules 8030NTS/M
can be implemented.
Output modules issue signals of the internal signal generators of module 8030NTC via various
electrical levels or via fiber optic. Parameterization of the particular signal generator can be
done via WebGUI of module 8030NTC. Status of the output modules will not be monitored via
status LEDs on the front panel. If the clock system is exclusively equipped with output mod-
ules, max. 8 output modules can be implemented.
System front view:
System rear side / plug-in side:
All installed system extensions deviating from the standard system Network Clock Device
8030HEPTA/NCD including the pertinent Status LEDs are documented and described in a
device-specific supplementary instruction.

SYSTEM BEHAVIOUR
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4 System Behaviour
This chapter describes the behaviour of the system in special operational phases and condi-
tions.
4.1 Boot Phase
The boot process of the Network Clock Device 8030HEPTA/NCD starts after turning on the
system or a reset.
This phase can be recognized by the LCD-Display and activated LED test of the Status LEDs
in the front panel.
During the boot process both Modules 8030NTC and 8030NTS/M boots its LINUX operation
system and is therefore not available via LAN.
The end of the boot process is reached when the LCD-Display changes to the standard picture
and the LED test of the Status-LEDs in the front panel has been finished.
Boot phase takes approx. 35 seconds by using static IP-addresses for
ETH0 and ETH1. Boot phase can be extended, depending on the network
configuration in use (e.g. DHCP).
4.2 Adjustment Process
During boot process the activated synchronization service (NTP or PTP) will automatically be
started on Module 8030NTC. After starting the synchronization service the module requires
approx. 5-10 minutes to be adjusted.
After the synchronization service of Module 8030NTC is adjusted, Module 8030NTC provides
a valid sync status to Module 8030NTS/M, whereby Module 8030NTS/M will be synchronized
based on the time information of Module 8030NTC. This requires approx. 5-10 minutes.
After that Module 8030NTS/M will be available as network time server.
4.3 Firmware-Update
Both modules 8030NTC and 8030NTS/M can mutually be updated.
Detailed information can be found in the module specific technical manuals of the modules
8030NTC and 8030NTS/M.
4.4 Activation of Functions (Activation Key)
There are individual, mutually independent activation keys available for module 8030NTC and
8030NTS/M depending on the serial number of the module where the functionality is intended
to be activated.
Detailed information can be found in the module specific technical manuals of the modules
8030NTC and 8030NTS/M.

INSTALLATION
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hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: [phone] • Fax: [phone] • Internet: http://www.hopf.com • E-Mail: [e-mail]
5 Installation
The installation of the Network Clock Device 8030HEPTA/NCD is described below.
5.1 Network Clock Device 8030HEPTA/NCD in 1U Housing
5.1.1 Installation of the 19 Inch Rack
The System is assembled in a 1U/84HP 19" housing for control cabinet installation (measure-
ment see Chapter 2.1 19 inch Rack 1U/84HP (Slim Line)).
The following steps are to be carried out:
•Place the rack in the control panel and fix to the mounting brackets on the front side of
the rack using 4 screws.
The side ventilation apertures on the right and left hand sides must not
be covered. Otherwise ventilation will not be effective and lack of con-
vection and / or thermal coupling with surrounding equipment may give
rise to an excessive equipment operating temperature.
•Ensure that there is sufficient space between the back of the rack and the control panel
to allow connection and data lines with the system
5.1.2 Earthing
The Network Clock Device 8030HEPTA/NCD is usually earthed via the PE cable of the power
supply.
An additional earth cable for surge protection purposes can be connected by means of the
earth screw located on the rear side of the System housing.
5.1.3 AC Power Supply
The Systems’ standard AC power supply unit is described here. However, the connection data
on the nameplate of the respective unit is always applicable.
Attention should be paid to the following when connecting the power supply:
•Correct voltage type (AC or DC)
•Voltage level
The power feed is via an input connector with EMI filter compliant with IEC/EN 60320-1/C14
I O
•Check that the mains power switch is in position " 0
" (= off).
•Plug the input connector into the System’s mains
power inlet.
•Connect the input connector to the mains power
supply and switch the line circuit breaker on.
The Network Clock Device 8030HEPTA/NCD can be damaged if incorrect
voltage is connected.

INSTALLATION
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hopf Elektronik GmbH
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5.1.3.1 Safety and Warning Instructions
Please read these instructions fully in order to guarantee safe operation of the equipment and
to be able to use all the functions.
Caution: Never work on an open unit when voltage is applied!
Danger to life!
The Network Clock Device 8030HEPTA/NCD is an installation device. Installation and com-
missioning may only be carried out by suitably qualified specialist personnel. In doing so the
respective country-specific specifications must be observed (e.g. VDE, DIN).
Before commissioning ensure that:
•The power supply has been connected correctly and electrical shock protection is in
place
•The earth wire is connected
•All supply cables are correctly sized and fused
•All output cables are suitably sized or specially fused for the max. output current of
the equipment
•Sufficient convection is guaranteed
The equipment contains life-threatening components and a high level of stored energy.
5.1.3.2 Power Supply Unit Specifications
All AC power supply specifications are described in Chapter 12 Technical Data.
5.1.3.3 Fusing
Pay attention to the correct fusing of the power supply when connecting the Network Clock
Device 8030HEPTA/NCD.
The corresponding performance data can be taken from the equipment nameplate. The Net-
work Clock Device 8030HEPTA/NCD is currently fitted with a power supply unit with a power
consumption of max. 20VA (Standard) or 40VA (47-63Hz).
If the internal fuse (device protection) trips it is highly probable that the
equipment is faulty. In this case the device should be checked in the fac-
tory.

INSTALLATION
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hopf Elektronik GmbH
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5.1.4 DC Power Supply (Option)
Ensure that the external power supply is switched off. When connecting the
supply cable make sure that the polarity is correct and the equipment is
earthed.
•The cable of the power supply is connected using a 2-pole
plug connector with additional earth connection and inter-
locked with the Network Clock Device 8030HEPTA/NCD:
+Vin:
Positive pole (contact 1)
–Vin:
Negative pole (contact 2)
PE:
Earth
The Network Clock Device 8030HEPTA/NCD can be damaged if incorrect
voltage is connected.
Earthing:
By default the minus pole (-Vin) and earthing (PE) are connected sys-
tem-sided.
5.1.4.1 Power Supply Unit Specifications
All DC power supply specifications are described in Chapter 12 Technical Data.
5.1.4.2 Fusing
Pay attention to the correct fusing of the power supply when connecting the Network Clock
Device 8030HEPTA/NCD.
The corresponding performance data can be taken from the equipment nameplate. The Net-
work Clock Device 8030HEPTA/NCD is currently fitted with a power supply unit with a power
consumption of max. 20VA (Standard) or 40VA (47-63Hz).
If the internal fuse (device protection) trips it is highly probable that the
equipment is faulty. In this case the device should be checked in the fac-
tory.
5.1.4.3 Reverse Voltage Protection
The version of Network Clock Device 8030HEPTA/NCD with DC supply has reverse voltage
protection. This protection prevents damage to the equipment due to an incorrectly connected
DC power supply.
Protection is effected by means of a self-resetting fuse. In the case of reverse polarity, it is
necessary to switch the equipment off for approx. 20 seconds after this fuse has tripped. The
power supply can then be connected with the correct polarity.