ABB Relion 620 Series, Technical Manual

Page: 1063 / 1224

Acting
operation
mode
Comman
d
Load
current
Block
lowering
voltage
Runback
raising
voltage
High
circulatin
g current
External
Block
Extreme
positions
Auto fol-
lower
Raise X X X X
Lower X X X X
Auto sin-
gle, Auto
master,
NRP, MCC
Raise X X X X X
Lower X X X
1
X X
2
In addition to the default blocking, the
Custom Man blocking setting has been
added due to different operation practices considering the manual command
blocking. The setting can be used to adapt blockings considering the manual
overcurrent, undervoltage or external blocking. (The blockings are in the table in
columns Load current, Block lowering voltage and External block for the manual
operating mode.) The default value for the parameter is "OC". This means that
default blocking schema explained in the table operates as such. However, there are
also other alternatives that cause different operation when compared to that table.
Table 1017: Customized manual blocking schema
Manual
blocking
type
Enumeration Description
1 Custom disabled No load current, blocking of lower (under) voltage or exter-
nal blocking have effect in the manual.
2 OC Load current blocking has an effect in the manual operation
mode
3 UV Block lowering (under) voltage blocking has an effect in the
manual operation mode
4 OC, UV Conditions 2 and 3 together: Load current and block low-
ering (under) voltage blocking have effect in the manual
operation mode
5 EXT External blocking has an effect in the manual operation
mode
6 OC, EXT Conditions 2 and 5 together: Load current and external
blocking have effect in the manual operation mode
7 UV, EXT Conditions 3 and 5 together: Block lowering (under) voltage
and external blocking have effect in the manual operation
mode
8 OC, UV, EXT All conditions 2, 3 and 5 together: Load current and block
lowering (under) voltage and external blocking have effect
in the manual operation mode
If the
Custom Man blocking setting is "Custom disabled", the blocking schema
regarding the acting operation mode "Manual" is as given in
Table 1018
. Other
operation modes follow the default schema.
1
Because the circulating current is only calculated in the NRP and MCC modes, it can have a
blocking effect only in these modes.
2
In these cases pure automatic operation notices that the extreme position has already been
reached and there is no need to activate the signal for data set event sending. The automatic
follower case can here be compared to a manual case and an event can be sent, that is, the
corresponding output is activated.
1MRS757644 H Control functions
620 series
Technical Manual
1063