MainsPro, SW version 1.4, ©ComAp – January 2013
MainsPro Application Guide
This way, MainsPro functionality may be simply controlled by a mobile telephone commands. All four
binary switches may be enabled or disabled by the appropriate setpoints in the group Basic.
External trip
In case that a specific protective function is requested and this function is not supported in
MainsPro, it may be provided in an external device. Wire the output of this device to Ext binary
switch to allow tripping by this external device.
Use the External trip also for forced disconnection of the generator if such command is for
example evaluated in a superior system or transmitted through remote communication device.
External trip functionality may be also used for intertripping method of protection system
topology. This method is required by the mains operator for bigger generators.
Fault reset
Use this switch in case that complex conditions are to be evaluated before the generator is
connected back to mains. These conditions may be processed in an external system and the
result may be sent to this switch.
External fault reset may be also provided in case that locked button is used for performing the
fault reset operation by authorized personnel only. In this case, MainsPro is to be secured
inside of the locked switchboard and external fault reset only made possible.
Remote fault reset via GSM communicator may also be a useful feature for the remote sites.
Alternative settings
Alt settings binary switch may be used in case that a specific setting of the protection relay is
required by the mains operator when exceptional conditions occur. After deactivation, the unit
immediately switches to the default groups of setpoints.
Disable
The Disable switch may be used for blocking the MainsPro protective functions, e.g. in case
that the generator is not running in parallel operation with mains, or any other blocking
conditions are fulfilled.
CB Feedback
The CB Feedback switch is used to confirm that a circuit breaker opened on a command
issued by MainsPro. Any time some protective function is activated and a trip is issued,
deactivation of this binary input is expected. If the feedback does not confirm opening of the
CB, additional back-up trip BakTrpPer and BakTrpImp will be issued after adjustable time
delay BakTrpDel.
Counters
Keeping a track of the most frequent trips may provide valuable information for the generator as well
as distribution network operator. Use the counters indication on the MainsPro screen for keeping track
of the most frequent failures detected in the point of your connection. For example, in case that the
MainsPro counters show significantly higher rate of a certain failure types (e.g. overvoltage or Vector
shift), it may be a good signal to perform a detailed evaluation of the voltage quality in the point of
connection or start discussions with the DNO to allow for wider limits of the protection setting to
minimize down-times of the generator.
Timer
MainsPro provides two time counters: since the unit power-up and since the last TRIP. Use these
timers for investigation of failures that were detected by MainsPro unit. Please note that MainsPro
does not provide RTC clock and after each power-up of the unit, the time and date is lost. For this
reason only indication of days / hh : mm is used. The accuracy of the time measurement may also not
be fully guaranteed. During internal tests, the measurement error of 4 seconds per 24 hours was
recorded.
Start trip
The unit supports start into the TRIP state after connection of the power supply, depending on the
setpoint Basic: Start Trip. If this setpoint is set to ENABLED, the unit goes into the TRIP state
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