ABB DCS 600 MultiDrive Series Manual page 28

Chapter 3 – Twelve–Pulse Parallel Configurations with DCS 600
Monitoring and fault
signals
In the 12 – pulse
parallel master
In both the mas-
ter and the slave
converter
3 - 4
II F2
It is recommended to set
the rated motor current. This will influence the scaling of the fol-
lowing signals available in the 12 – pulse parallel master:
ARM CUR ACT SL
(2.21)
ARM CUR ALL
(2.22)
CONV CUR ALL
(2.23)
In both the master and the slave converter, the current control
status signals of both converters are available:
CTRL STAT MA
(3.09)
CTRL STAT SL
(3.10)
B0: 1 == CURR CONTROL STAT
B1: Sign of CUR REF 3
B2: 1 == Bridge changeover is active
In 12 – pulse parallel mode, the master converter monitors the
slave current. If the currents of both converters differ more than the
permitted difference programmed to parameter
, for more than the number of control cycles (3.3 ms at 50
(47.04)
Hz) programmed to parameter
(12 – pulse current deviation) is activated.
66 CURR DIFF
If the 12 – pulse communication timeout has elapsed without re-
ceiving a valid DDCS message from the 12 – pulse master, the
slave activates the fault
fault).
Note: The same timeout monitoring is done by the 12 – pulse
master, too.
MOTOR NOM CURRENT (99.03)
12 – pulse slave motor current
100 % = MOTOR NOM CURRENT (99.03)
12 – pulse motor current; sum of the
motor currents of both the master and
the slave converter.
100 % = 2 x MOTOR NOM CURRENT (99.03)
12 – pulse motor current; sum of the
converter currents of both the master
and the slave converter.
100 % = 2 x CONV NOM CURR (4.05)
current control state of the master
current control state of the slave
(3.12)
DIFF CUR DELAY (47.05)
(12 – pulse communication
67 12P COMM
DCS 600 Manual for 12 – Pulse Operation
= [50%] of
not zero
(6.01)
DIFF CUR LIMIT
, the fault