Westermo IDW-90 User Manual
Page 15
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6620-2200
* To minimise the risk of interference, a shielded cable is recommended when the cable is located inside 3 m
boundary to the rails and connected to this port.
The cable shield should be properly connected (360°) to an earthing point within 1 m from this port.
This earthing point should have a low impedance connection to the conductive enclosure of the apparatus
cabinet, or similar, where the unit is built-in. This conductive enclosure should be connected to the earthing
system of an installation and may be directly connected to the protective earth.
Generic I/O Relay Output
Electrical specification
One change over contact
Switching voltage
Max 40 VAC/DC
Switching current
Max 500 mA AC/DC
Electrical endurance
5 x 10
5
operations @ 20 W / 20 VA Resistive load
Transmission range
Cable Length
≤15 m
Connection
Detachable screw terminal (DCE )
Connector size
0.2 – 2.5 mm
2
(AWG 24 – 12)
Isolation to
Power port 3 kV
rms
50 Hz 1 min
ISDN line 2 kV
rms
50 Hz 1 min
RS-232 1.5 kV
rms
50 Hz 1 min
RS-485 1.5 kV
rms
50 Hz 1 min
I/O input 2 kV
rms
50 Hz 1 min
Shielded cable
Not required*