
Installing the Device
2.4 Connecting the Failsafe Alarm Relay
2.4
Connecting the Failsafe Alarm Relay
The failsafe relay can be configured to latch based on alarm conditions. The NO
(Normally Open) contact is closed when the unit is powered and there are no active
alarms. If the device is not powered or if an active alarm is configured, the relay
opens the NO contact and closes the NC (Normally Closed) contact.
Note
Control of the failsafe relay output is configurable through RUGGEDCOM ROS. One
common application for this relay is to signal an alarm if a power failure occurs.
For more information, refer to the
RUGGEDCOM ROS Configuration Manual
for the
device.
Note
The screw-type terminal block is installed using Phillips screws and compression
plates, allowing either bare wire connections or crimped terminal lugs.
Use M3.5 ring lugs that have short insulated ring terminals with a maximum distance
of 5 mm (0.2 in) from the ring center to the insulation.
To connect the failsafe alarm relay, do the following:
1. Connect the failsafe alarm relay terminal block to the device. The terminal block
is available as either a screw-type terminal block or a pluggable terminal block.
• For a screw-type terminal block, insert the terminal block into the device.
The terminal block will be secured to the device when the safety cover is
installed later in the installation process.
• For a pluggable terminal block, insert the terminal block into the device and
tighten the screws.
1
2
1
Pluggable Terminal Block
2
Screw-Type Terminal Block
Figure 2.4
Assembling the Failsafe Alarm Relay Terminal Block
14
RUGGEDCOM RST2228P
Installation Manual, 07/2021, C79000-G8976-1403-13