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AMF26-P, SW version 2.4, ©ComAp – January 2016 27
AMF26-P-2.4 Reference Guide.pdf
Binary input DualAMFCtrlIn and binary output DualAMFCtrlOut adjust their function automatically
based on fact if there are used in Master or in Slave controller.
Master controller has information about Slave controller and when Slave failure or cannot work the
Master will substitute it.
AMF start of Slave controller can be blocked by Master but when Master controller has failure or
cannot work the Slave will substitute it.
When there is incorrect wiring or only one controller is configured as Master or Slave than the
controller will display "DAMF Discconect" in alarm list.
In case of incorrect configuration (two Masters, two Slaves, both controllers are not in AUT mode) the
controller will display "DAMF ConfigError" in alarm list.
When there is any problem with Slave controller Master will display "DAMFSlaveDown" in alarm list.
Every time when any Alarm related to DAMF function is occurring both of the controllers are switched
to normal AMF operation. That meaning that at least one of the controllers will be able to supplying the
load until failure on both of them.
To decide which genset should start in case of mains fail, there is rule that if mains fails in time period
00:00AM – 11:59AM, than Master will start and take the load. If mains will fail in period 12:00PM –
23:59PM, than Slave will start and take the load.
Master controller will prevent unnecessary blackout in case, when it is over 12:00 AM (Slave starting
period), and Master is already supplying load, but not in AUT mode with DualAMF function enabled,
and mode is changed to AUT. Or if Master is already supplying load in AUT, and it is switched to
DualAMF operation after 12AM (in Slave’s starting period).
Setpoint “MCB Opens On” has to be setted to MAINSFAIL. Otherwise system would not correctly work
if Slave would start to stand-by as first. Master would not know when to open MCB breaker.
In case one gen-set should run in stand-by, but it fails, the other gen-set runs instead. After failed gen-
set recovers there is 60s delay for load transfer back to this gen-set.
Setpoints related to Dual AMF function are located in "AMF Settings" group.
Setpoint "DualAMFRole" with settings [MASTER, SLAVE] is determining if controller behaves as
Master or Slave in Dual AMF system. One controller has to be set to MASTER and second as SLAVE,
for correct function of system.
Binary input "DualAMFRole" can help in switching roles of both gen-sets. Both gen-sets can be easily
transformed from Slave to Master and vice versa. Log1 = MASTER, Log 0 = SLAVE. Binary input has
higher priority over manual setting of setpoint. If binary input is configured, manual change of setpoint
is disabled.
Setpoint „DualAMFTime“ control time period of gen-sets switching in supplying the load. Settings are
[1..24], step = 1 hour. Default setting is 6 hours. This timer is reset when load is transferred back to
healthy mains
Example of setting the Dual AMF function:
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