IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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Range: 50,0 - Mains>f % of Nominal freq
Protection: Mains protection.
Force value possibility: Yes
Hint:
The mains frequency is evaluated from the L3 phase.
Mains f del [ s ]
Delay for mains under frequency and over frequency protection.
Step: 0,02 s
Range: 0,00 – 600,00 s
VectorS prot [ DISABLED / PARALLEL ONLY / ENABLED ] (FV)
DISABLED: Vector shift protection is disabled.
PARALLEL ONLY: Vector shift protection is enabled only if the gen-set is running in parallel with mains (=
MCB+GCB status active).
ENABLED: Vector shift protection is enabled if MCB status is active. The setting does not work in
the case of SPI application since MCB can not be controlled.
Force value possibility: Yes
Hint:
If ENABLED is selected, it is likely that Vector shift protection will trip the MCB before other mains
protections. It senses the fast changes in mains voltage angle position, which occur with every mains failure,
even if the gen-set is not running in parallel with mains.
VectorS limit [ ° ]
Vector shift protection threshold level.
Step: 1°
Range: 1 – 45°
Hint:
To be sure of proper adjusting of VectorS limit, check Max VectorS value on the controller or PC software
screen. Max VectorS value is set to zero when transiting to parallel, and then accumulates the maximum
reached value (positive only) during parallel operation. Thus, during the normal operation, only the
“background noise” is accumulated (usually max 3°), and the protection level should be set to approximately
twice the value of this “noise”.
Mains V unbal [ % ]
Threshold for mains voltage unbalance alarm in % of nominal voltage. The voltage unbalance is calculated
as a maximum difference between phase voltages.
Step: 1%
Range: 0 – 200% of MainsNomV or MainsNomVph-ph respectively
Mains V unb del [ s ]
Delay for mains voltage unbalance alarm.
Step: 0,1s
Range: 0 – 600,0 s
Protection: BreakerOpen & Cool-down.
AMF settings
Mains ret del [ s ] (FV)
Delay after the mains return to the start of synchronizing of GCB.
Step: 1 s
Range: 0 – 3600 s
Force value possibility: Yes
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