InteliMains
NT
, SW version 3.0
InteliMains-NT-BTB-3.0-Reference Guide.pdf, ©ComAp – June 2013
7.6 Controller Redundancy
Redundant system is a general term for applications where there are two controllers at each gen-set.
One is the main controller, which controls the gen-set in normal conditions, the other is the redundant
controller, which takes over the control when the main controller fails. Both controllers have identical
firmware and most of the configuration and setpoints. Only several things need to be
adjusted/configured differently because of the rendundancy function itself.
CAUTION!
If there are shared binary or analog outputs used on InteliMains (e.g. for system start/stop), it is
necessary to prepare the configuration in the way so each controller uses binary or analog output set
with different address. Configuration in gen-set controllers then needs to be altered so it can receive
signals from both InteliMains controller (e.g. using built-in PLC functions).
7.6.1 Redundant systems using binary signals
It is not possible to use this redundancy system since correct function of InteliMains depends on CAN
bus communication and thus CAN redundancy should be always used.
7.6.2 Redundant systems using CAN bus
This system uses the CAN bus for detection whether the main controller is operational or not. If the
redundant controller has not received two consequent messages from the main one (~100ms) it will
take over the system control - it activates the binary output CTRLHBEAT FD, which has to be wired in
such a way, that it disconnects the dead main controller from the control, connects the redundancy
controller instead and activates it by deactivation of the binary input EMERG. MANUAL.
As there can be up to 16 pairs of controllers at the CAN bus it is necessary to select which main
controller (address) belongs to which redundant one. The setpoint ProcessControl:Watched Contr is
used for this purpose. It must be adjusted to address of the respective main controller in each
redundant controller and it must be adjusted to 0 in each main controller.
CAUTION!
Correct wiring of all inputs and outputs that should be used both by the main and the redundant
controller needs to be done. Please refer to the corresponding chapter for wiring of binary inputs and
outputs.
Do not use Shared Binary Inputs/Outputs for CTRLHBEAT FD -> EMERG.MANUAL connection since the
failed controller may not interpret it correctly!
VPIO
VPI
VPO
CtrlHBeat FD
Emerg. manual
CAN
LOG BOUT
LOG BIN
Watched contr = X
Setpoint
Emerg. manual
LOG BIN
CAN
BOUT
BIN
LOG BIN
MAIN CONTROLLER
REDUNDANT CONTROLLER
Contr. Address = X
Setpoint
Figure: Example of redundancy function
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