MainsPro, SW version 1.4, ©ComAp – January 2013
MainsPro Reference Guide
any frequency protection is disabled by setpoint (limit set to 0), the output does not signal activation of
this protection stage.
LOM Sig
Immediate signalling relay – loss of mains; closes immediately in case of loss of mains failure (Vector
shift or ROCOF). Relay opens after LOM: LOM Trip Del since the last LOM protection activation. Fault
reset has no influence on this output. If any LOM protection is disabled by setpoint (limit set to 0), the
output does not signal activation of this protection stage.
!LOM Sig
Inverse immediate signalling relay – loss of mains; opens immediately in case of loss of mains failure
(Vector shift or ROCOF). Relay closes after LOM: LOM Trip Del since the last LOM protection
activation. Fault reset has no influence on this output. If any LOM protection is disabled by setpoint
(limit set to 0), the output does not signal activation of this protection stage.
dU Sig
Immediate signaling relay – asymmetry; closes immediately in case of voltage (amplitude) unbalance,
positive sequence undervoltage, negative sequence overvoltage, or failure (over or under frequency).
Relay opens in case that all three evaluation methods of voltage asymmetry are in fail-free state, but
no sooner than after Basic: Imp Len from its activation. If the relay is closed during trip activation, it
opens no sooner than Basic: Imp Len since trip status activation. Fault reset has no influence on this
output. If any asymmetry protection is disabled by setpoint (limit set to 0), the output does not signal
activation of this protection stage.
!dU Sig
Inverse immediate signaling relay – asymmetry; opens immediately in case of voltage (amplitude)
unbalance, positive sequence undervoltage, negative sequence overvoltage, or failure (over or under
frequency). Relay closes in case that all three methods of voltage asymmetry are in fail-free state, but
no sooner than after Basic: Imp Len from its activation. If the relay is open during trip activation, it
closes no sooner than Basic: Imp Len since trip status activation. Fault reset has no influence on this
output. If any asymmetry protection is disabled by setpoint (limit set to 0), the output does not signal
activation of this protection stage.
Other Sig
Immediate signaling relay – other failures; closes immediately in case of incorrect phase rotation,
wrong polarity of one phase or External trip. Relay opens in case that all observed failures are not
active, but no sooner than after Basic: Imp Len from its activation. If the relay is closed during trip
activation, it opens no sooner than Basic: Imp Len since trip status activation. Fault reset has no
influence on this output.
!Other Sig
Inverse immediate signaling relay – other failures; opens immediately in case of incorrect phase
rotation, wrong polarity of one phase or External trip. Relay closes in case that all observed failures
are not active, but no sooner than after Basic: Imp Len from its activation. If the relay is open during
trip activation, it closes no sooner than Basic: Imp Len since trip status activation. Fault reset has no
influence on this output.
TrpEndImp
Impulse at the end of the TRIP state. The output is normally activated during operation of the unit. The
output deactivates at the end of the TRIP state (i.e. after successful Fault Reset is performed) for
period given by the parameter Imp Len.
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