ABB DCS550 Kurzanleitung Seite 12

START, STOP and E-STOP control
The relay logic can be split into three parts:
a: Generation of the ON/OFF and START/STOP command:
The commands represented by K20 and K21 (latching inter-
face relay) can be e.g. generated by a PLC and transferred to
the terminals of the converter either by relays, using galvanic
isolation or directly via 24V signals.
These commands can be as well transferred via serial com-
munication. Even a mixed solution can be realized by select-
ing different possibilities for the one or the other signal (see
parameter group 11).
b: Generation of control and monitoring signals:
The main contactor K1 for the armature circuit is controlled
by a dry contact (DO 8) located on the SDCS-PIN-F. Status
of fans and fans klixon can be monitored by means of fan ack
signals: MotFanAck (10.06).
c: OFF2, OFF3 Stop function:
Beside ON/OFF and START/STOP, the drive is equipped with
two additional stop functions, OFF2 and OFF3, according to
Profibus standard. OFF3 is a scalable stop function (ramp-
stop, max torque stop, dynamic braking ...) to perform stop
category 1. This function should be connected to the E-STOP
button without any time delay. In case of ramp stop selection
the, K 15 timer relay must be set longer than the EStopRamp
(22.04). For COAST selection, the drive opens the main con-
tactor immediately.
OFF2 switches off DC current as fast as possible and pre-
pares the drive for opening main contactor or drop down
mains supply. For a normal DC motor load the time to switch
OFF the DC current is below 20 ms. This function should be
connected to all signals and safety functions opening the main
contactor. This function is important for 4-quadrant drives. Do
not open main contactor during regenerative current.
The correct sequence is
1. switch off regenerative current
2. then open the main contactor
In case of the E-STOP is hit, the information is transferred to
the converter via digital input 5. In case of rampstop, or max
torque selection the converter will decelerate the motor and
then open main contactor.
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3ADW000395R0100 DCS550 Quick guide edisf a 3ADW000395R0100 DCS550 Quick guide edisf a
If the drive has not finished the function within the K15 timer
setting, the drive must get the command to switch OFF the
current via K16. After K16 timer set has elapsed the main
contactor is opened independent of the drives status.
gen_ctrl_cmd_c.dsf
Anschl_special_b.dsf
E-STOP
Timer K15
Timer K16
Block current control
K1 main contactor
E-Stop ramp Coast
Stop-Mode_a.dsf
E-Stop reaction
speed