10
C048-702-30 R02, Rev. B (03/2021)
5.2
5.2 Control Options
Control Options
Option A: Internal TRD detect and self-
disconnect
This option does not require an external monitoring or
control system such as a fire suppression controller and
simply uses the thermal runaway detect relay output of
the TRD module to connect into the EPO switch input of
the DCX control PCB� Essentially the TRD alarm relay
closes and sends an EPO signal to the DCX which trips
the battery circuit breaker and isolates the batteries from
the charging system� This approach is viable for small
systems with a single battery stack, remote sites such
as cell sites, cabinets or equipment rooms where a fire
suppression system may not be present or where there
may not be sufficient supervisory control functions in the
fire suppression or monitoring controller.
Figure 6. Internal TRD detect and self-disconnect
Figure 7. Internal TRD detect and remote disconnect control
Option B: Internal TRD detect and remote disconnect control
This option requires use of a remote controller device of some kind such as a fire control panel or supervisory controller
or PLC etc� This device can monitor both the pre-alert and TRD relays of the TRD module and provide remote
monitoring, send an alarm to a call center, send a fire department alarm and/or provide an EPO trip signal back to the
DCX unit after a programmable time delay after waiting for manual intervention first etc.
The remote controller device provides the control monitoring and trip control� The advantage of this approach is that
the controller device can also monitor other site conditions to determine if the DCX breaker should be EPO tripped off.
Examples include EPO wall switches pushed, remote hydrogen sensors detecting out gassing, ventilation – cooling
system failure etc� Any one of these conditions can be programmed to send an EPO trip signal to the DCX including the
thermal runaway detection from the TRD module�
