Dc Power Supply Wiring And Grounding; Failsafe Output Wiring - RuggedCom RuggedSwitch RS950G Hardware Installation Manual

2. Installation

2.3.2. DC Power Supply Wiring and Grounding

Figure 2.4. DC Power Supply Wiring and Grounding
The low voltage DC power supply features reverse polarity protection and dual independent inputs.
The latter feature allows the connection of two DC sources with the same nominal voltage to
provide redundant power supply inputs.
The DC power supply inputs should be connected as follows:
1. Connect to the DC inputs according to the polarity markings on the unit.
2. Surge Ground should be connected to the Chassis Ground via a braided cable or other
appropriate grounding wire. Surge Ground is used as the ground conductor for all surge and
transient suppression circuitry internal to the unit.
3. Chassis Ground must be connected to the protective earth.
1. Equipment must be installed according to the applicable country wiring codes.
2. All line-to-ground transient energy is shunted to the Surge Ground terminal. In
cases where users require the inputs to be isolated from ground, remove the
ground braid between Surge and Chassis Ground. Note that all line-to-ground
transient protection circuitry will be disabled.

2.3.3. Failsafe Output Wiring

The Failsafe output relay is provided to signal critical error conditions that may occur on the
unit. The contacts are energized upon power up of the unit and remain energized until an alarm
condition or power loss occurs.
Figure 2.5. Failsafe Relay Output
RuggedCom® RuggedSwitch™ 17 RS950G Installation Guide Rev 100