I
NSTALLATION
8030HEPTA/NCD Network Clock Device - V04.00
20 / 43
hopf
Elektronik GmbH
Nottebohmstr. 41
• D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
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:
+V
in
:
Positive pole (contact 1)
–V
in
:
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.
