Westermo U200 Operator manal - Manual (Page 13)

V4.5
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U/R/T200 series
- 13 -
5 Power Supply Connector
5.1 Redundant power inputs
The switch is designed to operate permanently over a very wide range of power (19 V DC to
60 VDC). Two redundant inputs are provided to provide enhanced redundancy if either supply
fails.
The power supply draws power from the input that has the highest potential difference when
compared to the alternate supply.
This enables use of e.g. a 48V source as primary supply with a 24VDC battery as back up.
Power supply inputs have reverse polarity protection.
Large transient protection devices are present on both power inputs. During transients,
transient currents of up to more than thousand Ampere may pass thru cabling infrastructure.
The switch is delivered with a power connector (Wieland 25.621.3553.0) that is suitable for
wires between AWG 20 and AWG 22 (0,34-0,5 mm
2 ).
Figure 4, Power contact
5.2 Fault Contact
The switch is incorporated with a user configurable fault contact (STAT pin) that enables
network and switch faults to be highlighted, see the Installation Guide.
The user configurable fault contact is a solid state component and therefore requires power to
control the device. The fault relay is equipped with transient protection.
As standard the fault contact will always highlight the following:
• Internal switch watchdog failure.
• Link / Port 7 Failure (if FRNT 0 is activated)
• Link / Port 8 Failure (if FRNT 0 is activated)
• Power Supply Failure
• Focal Point / Redundancy Mode activated.
Using the Switch configuration software (relevant for switches in the R200 and T200 series),
the fault contact can highlight the following addition failures:
• Link / Port 1 to Port 8 Failure; relevant for the R/T200 series.
• A minute pulse that is used for time synchronization can be enabled for switches in
the T200 series. This is a special function that disables all other fault indication.