Control Techniques COMMANDER SE, Руководство для продвинутых пользователей

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110
Commander SE Advanced User Guide
Issue Number: 4
4.4 Control terminal connections
The terminal connections are shown in Figure 4-8. As default - in positive logic. Maximum control terminal screw torque: 0.6
Nm (5.5 lb in).
Figure 4-8 Control terminal connections
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 of the Commander SE User Guide 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.
4.5 Serial communication connections
Serial communication connections can be made via the RJ45 connector (see Figure 4-8).
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 19.2KBaud.
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