InteliMains
NT
, SW version 3.0
InteliMains-NT-BTB-3.0-Reference Guide.pdf, ©ComAp – June 2013
The setpoint adjusts the delay for busL under- and overvoltage protections.
The thresholds for these protections are adjusted by setpoints BusLeft >V
and BusLeft <V.
NOTE:
Although the resolution of this setpoint is 0.01s, in fact the adjusted delay is
rounded to the next higher multiple of the period of the mains voltage. The
period is either 0.02s for 50Hz systems or 0.0166s for 60Hz systems. E.g. if
the delay is set to 0.03s at 50Hz system the real delay will be 0.04s.
12.2.6.10 Setpoint: BusLfreq prot
This setpoint enables or disables BusL frequency protection. For more
information on this protection see setpoints BusLeft >f, BusLeft <f and
BusLeft f del.
NOTE:
If both voltage and frequency protections (see also setpoint BusLVolt prot)
are disabled there is no way for the controller to decide whether the busL is
healthy or not. In this case busL is considered healthy if there is any voltage.
12.2.6.11 Setpoint: BusLeft >f
This setpoint adjusts the threshold level for the busL overfrequency
protection. The threshold is adjusted in % of the buses' system frequency
which is given by Nominal Freq and its offset Nom frq offset.
The protection activates if the frequency in phase L3 gets over the threshold
for time longer than BusLeft f del.
NOTE:
The busL overfrequency protection is History record type - for more
information on protection types please refer to alarm types section.
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