ABB RELION REX640, Техническое руководство, Страница: 1717 / 1960

The cross (X) in the table defines when the operation is blocked (if the
corresponding bit is active in BLK_STATUS). For example, an overvoltage (runback
raising voltage) results in blocking only when the active operation mode is "Manual"
and the manual raising command is given.
Table 1575: Default blocking schema in OL5ATCC
Active
operation
mode
Comman
d
Load
current Block
lower
voltage
Runback
raise
voltage
High
circulatin
g current
External
block Extreme
positions
Manual,
Parallel
manual
Raise X X X
Lower X X
Auto fol-
lower
Raise X X X X
Lower X X X X
Auto sin-
gle, Auto
master,
NRP, MCC
Raise X X X
1
X X
2
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 of the manual command blocking.
The setting can be used to adapt blockings considering the manual overcurrent,
undervoltage or external blocking. (The blockings are in
Table 1575
in columns
Load current, Block lower voltage and External block for the manual operating
mode.) The default value for the parameter is "OC". This means that the default
blocking schema explained in
Table 1575
operates as such. However, there are other
alternatives that cause different operations.
Table 1576: Customized manual blocking schema
Manual
blocking
type
Enumeration Description
1 Custom disabled No load current, block lower (under) voltage, external block-
ing has no effect in the manual operation modes
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 lowering
(under) voltage blocking have effect in the manual operation
mode
Table continues on the next page
1
Because the circulating current is calculated only in the NRP and MCC modes, it can have a
blocking effect only in these modes.
2
In these cases the 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.
1MRS759142 F Control functions
REX640
Technical Manual
1717