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7.4.4.5
Fast load shed trigger logic
This module calculates the fast load shed trigger to initiate the load-shedding action.
CB_POSITION
CB_LOCK_OUT
CB_SERVICE
FLS_TRIGGER
INHIBIT_TRG
Load-shedding
blocking
(From Block logic module)
Close
Open
Intermediate
Open
1
0
OR
AND
GUID-45962C27-4CCB-4848-9F22-2B31A9656464 V1 EN
Figure 134:
Fast load shed trigger logic
If the
BLK_BYPASS
output is active,
FLS_TRIGGER
remains
FALSE.
The output
FLS_TRIGGER
(fast load-shedding trigger) is provided to the Binary to
integer module.
7.4.4.6
Over current based load shed
This module calculates the slow load-shedding start and slow load-shedding trigger
based on the phase overcurrent detection of the power source or external trigger input
activation.
The
Slow load shed mode
setting enables or disables the Over current based load shed
module. If the
Slow load shed mode
setting is "OC & Ext Trg " or "OC, Max Dmd, Ext
Trg", the Over current based load shed module is enabled, else it is disabled.
This module compares the effective start value to the maximum of the
I_A
,
I_B
,
I_C
inputs.
If the input
ENA_MULT
(enable start value multiplier) is TRUE, the effective start
value is the product of the
Start value
and
Start value Mult
settings, else the effective
start value is same as the
Start value
setting.
If the maximum of the
I_A
,
I_B
, or
I_C
inputs is greater than the effective start
value, the output
OC_STR
(overcurrent start) is TRUE, else the output
OC_STR
is
FALSE. The maximum of the
I_A
,
I_B
, or
I_C
input is provided as the
MAX_CURRENT
output. The effective start value is provided by the
PICKUP
output.
If the phase overcurrent is detected, the output
OC_TIME
(overcurrent operating time)
is calculated as per the
Operating curve type
setting. After the operate time, the
OC_OPR
output is TRUE.
Section 7
1MRS757256 F
Power management functions
222
PML630/Compact Load-Shedding Solution
Technical Manual
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