Commander SE User Guide 36
Issue Number 8 www.controltechniques.com
The connection arrangement shown here illustrates how the terminals are
intended to be used. Screening of the analog signal wires is not essential, but
reduces the risk of electrical noise causing disturbance to the signals.
Where full EMC precautions are required, the guidelines in section 4.5.2 must also
be followed to ensure compliance with radio frequency emission limits. This
requires the use of one or more screened cables for all wiring to terminals 1 to 14,
with the screen bonded to the gland plate (ground). This results in the 0V common
terminal being connected to ground through the cable screen.
Where it is required to keep 0V separate from ground, there are two possibilities:
• Use a multi-core cable with overall screen, using one core for the 0V
connection. There is a slight risk of electrical noise affecting the analog
inputs.
• Use a double screened cable for the analog inputs, with the inner screen
connected to 0V and the outer screen to ground.
5.3 Serial communication connections
Serial communication connections can be made via the RJ45 connector (see Figure
5.3).
PIN 2 RXTX
PIN 3 0V
PIN 4 +26V (+10% / -7%) 100mA serial communications
PIN 6 TX Enable
PIN 7 RX\TX\
When using a suitable serial communications converter with Commander SE, it is
recommended that no terminating resistors be connected on the network. This applies
to any of the drives on the network and also any converter used. It may be necessary to
link out the terminating resistor within the converter, depending on which type is used.
The information on how to link out the terminating resistor will normally be contained in
the user information supplied with the converter. Terminating resistors are of little or no
value when used on RS485 networks operating at or below 19.2k baud.
For further information, refer to the Commander SE Advanced User Guide.
The communications port of the Commander SE drive is double-insulated from
the power electronics and single-insulated from the status relay contacts.
Providing that the voltage on the status relay contacts does not exceed 110V, the
communications port meets the requirements for SELV in EN50178. However, in
the event of a serious fault in the drive, the safety barriers could be breached.
Therefore when using the communications port with a personal computer or
centralised controller e.g. PLC, an isolation device must be included with rated
voltage at least equal to the drive supply voltage. Ensure that the correct fuses
are installed at the drive input, and that the drive is connected to the correct
supply voltage.
NOTE
WARNING
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