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3.2.4 Platinum Fail Safe
In case of a failure in a Platinum controller, the RBU-27 SE:
o opens the selected air source (Inlet or Tunnel)
o turns on Fans 1-4
o lights the Controller Alarm LED
NOTE: Only Platinum Controllers support the Fail Safe feature.
WARNING! On the Platinum Front Panel, set the Fail Safe Relay to Auto. Do not set the Fail Safe relay
switch to ON. Setting the switch to On overrides the software; the relay is not released during
a controller failure and RBU-27 SE does not operate!
Set a relay in the Platinum Controller to act as the fail-safe relay.
o Timer Delay
o Setting the Relay
3.2.4.1 Timer Delay
Normally, RBU-27 SE timers operate consecutively. Meaning, each device's begins to operate 1) only after the previous
device is already operating and 2) after the device's delay time has elapsed. However, in Fail Safe mode all devices begin
to operate simultaneously, after the 30 second delay time has passed.
3.2.4.2 Setting the Relay
Platinum Software Version 3.0 and above includes a dedicated Fail Safe relay.
Go to Management> Fail Safe settings and configure the alarm type for the fail safe function.
3.2.5 Inlet/Tunnel Power Supply
Even during normal operations, power to the Platinum Controller Open Inlet/Tunnel is routed through the RBU-27 SE.
When the RBU-27 SE takes control for opening the inlets or tunnel curtains, it disconnects power to the Platinum.
NOTE: The RBU-27 SE only opens inlets or tunnel curtains. It does not close them.
Anytime that the RBU-27 SE detects that power is not being supplied via L1 it automatically activates Fans 1 – 4. In this
case, the Control Failure LED is lit on the front panel.
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