DL7, DL7L
33
8.3 Power connection
The power adapter used with the device is capable of delivering stabilized and non-
stabilized 24 DC voltage. It is recommended to supply the device using an insulated 50 W
power source.
To ensure safety, the recorder's supply must satisfy the conditions
applicable to lower voltage sources SELV (Safety Extra Low-
Voltage), supplied with the 24 V DC as per the IEC60950-1.
While connecting the supply the "+” pole should be connected to yoke no. 5, while "–”
pole to yoke no. 6. Yoke 7is the ground terminal. In order to eliminate interference, it is
recommended to connect the ground wire to the terminal block of the measurement cabinet
ground potential (the so called functional ground wire).
The device is fitted with a delay fuse that breaks the power circuit in case of failure. The
fuse may be replaced solely at the authorised workshop.
Power consumption depends on the quantity and type of input and output modules.
Details of protected operations are provided in Sec.
8.4 Connection of RS-485 data transmission line
If available with the serial RS-485 port, the device is to be connected in parallel to yoke
no. 2 marked as A(+) terminal is connected to A terminal, with B(-) connected to B. The
terminal strip has a signal wire marked as "G” – terminal no. 3 and no. 4. The „G” terminal
is used as ground potential for lines A+ and B- and should be connected between the
interfacing devices. If another device has only lines A+ and B-, the G line is not connected.
!
The RS-485 inputs should not create a star configuration. Devices should be
connected sequentially (ends of RS-485 inputs must end with resistors
matching the wave impedance). In industrial conditions strongly recommended
is Twisted Pair ( the best would be Shielded Twisted Pair). The screen should
be grounded or connected to the reference potential at least in one end of the
line. The RS-485 standard allows a connection of up to 32 devices, the
maximum line length is 1300 m
.
It is recommended to use a digital data
transmission cable (e.g. for Profibus).
8.5 Port Ethernet
Ethernet (100Base-T) port is located in the rear panel of the device. Outputs
connections are compliant with EIA/TIA-568A/B. A wire of 8 twisted conductors may be
connected to this port ended with RJ-45 plug.