2-4
e
Installing the RS485 Communications Card
• Do not operate the switch SW1 with wet hands.
Doing so could cause electric shock.
• Before starting installing the RS485 Communications Card, first turn off the power, wait
more than 5 minutes, and make sure, using a circuit tester or another appropriate
instrument, that the DC voltage between the P (+) and N (-) terminals of the main circuit is
less than +25 VDC.
Otherwise electric shock could occur.
• A high voltage is present just on the RS485 Communications Card. Do not remove the
cover for the control circuit terminal block (TB) while power is applied.
Doing so could cause electric shock.
• Generally, the sheath of control circuit wires is not reinforced by any insulation. If the
control circuit wires come into direct contact with the live main circuit terminal, therefore,
the sheath may break. Accordingly, there is a possibility that high voltage on the main
circuit may be applied to the control circuit wires. It is DANGEROUS. Be sure to keep the
control wires away from the live main circuit terminals.
An accident or electric shock could occur.
Be sure to turn SW1 (termination resistor on/off
switch) on the RS485 Communications Card to the
OFF position as shown at right. (Upon shipment from
the factory, SW1 is set to OFF.)
Figure 2.5 Setting of SW1 on RS485
Communications Card
Install the RS485 Communications
Card following the steps below.
1)
If the control circuit terminal
block (TB) cover is in place,
remove it by inserting your
finger in the cutout (near
"PULL") in the bottom of it
and then pulling it towards
you.
Figure 2.6 Removing the Control Circuit Terminal Block Cover
SW1
Model name
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