Under frequency initiation
Function monitors the active supply feeder frequency. If under frequency initiation
is enabled, then transfer is initiated if the supply feeder frequency falls below
the set value. The threshold can be set with a setting
Start Val frequency. Under
frequency initiation is enabled if
Operation mode setting is “Freq<” or “Freq< or U<”.
Under frequency transfer initiation can be delayed with a setting
Under frequency
time.
Output
INIT_UF
is activated if transfer is initiated by internal under frequency
initiation. Output
INIT_UF
can be activated only if function is ready for transfer, i.e.
READY
output is active.
Under voltage initiation
Function monitors the active supply feeder voltage. If under voltage initiation is
enabled, then transfer is initiated if any the connected supply feeder voltages fall
below the set value. The threshold can be set with a setting
Start Val voltage. Under
voltage initiation is enabled if
Operation mode setting is “U<“ or “Freq< or U<”.
Under voltage-based transfer initiation can be delayed with a setting
Under voltage
time.
Output
INIT_UV
is activated if transfer is initiated by internal under voltage
initiation. Output
INIT_UV
can be activated only if function is ready for transfer,
i.e.
READY
output is active.
External transfer initiation
The bus transfer action can be initiated externally by different inputs:
• INIT_TR_1_2 – Initiates any enabled transfer from feeder 1 to feeder 2
• INIT_TR_2_1 – Initiates any enabled transfer from feeder 2 to feeder 1
• INIT_MANUAL – Initiates manual transfer, transfer direction depends on which
direction is enabled in transfer direction block
Bus transfer initiation can be disabled with different inputs:
• DISA_INIT – Disables all transfers
• DISA_1_2 – Disables all transfers from feeder 1 to feeder 2
• DISA_2_1 – Disables all transfers from feeder 2 to feeder 1
If transfer initiation is signaled to direction that is allowed, transfer initiation is
signaled to Bus transfer module (transfer initiation).
Output
INIT_EXT
is activated if transfer is initiated by external initiation. Output
INIT_EXT
can be activated only if function is ready for transfer, i.e. READY signal
(from Evaluation module) is active.
When function is ready for transfer, this is shown with output
READY
. If transfer
initiation is not possible, then
NOT_READY
output is activated.
Output
INIT_MAN
is activated if transfer is initiated manually. Output
INIT_MAN
is
activated only if function is ready for transfer, i.e. READY signal (from Evaluation
module) is active. Manual initiation is controlled by
Manual transfer setting as
explained in
1MRS759142 F
Control functions
REX640
Technical Manual
1769