ABB DCS 400 - Minimal Circuitry for the Drive Logic; Switch-Off Sequence of DCS 400

II K 4-26
Overview of Software
Fig. 4.4/2: Switch-off sequence of DCS 400
Minimal circuitry for the drive logic
All digital inputs of the drive logic are edge-sensitive,
i.e. the function concerned will be executed only if
there is a signal change from 0 ÿé 1 or 1 ÿéÿ 0.
Drive is controlled using two commands (On and Run
separated)
On
Run
Reset
+24V
Speed Ref
Eme Stop
On
Run
Reset
+24V
Speed Ref
Eme Stop
On
Run
Reset
+24V
Speed Ref
Eme Stop
Ready for On
Recommended circuitry
On and Run can be control-
led edge-sensitively. Stop
Mode (2.03) and Eme Stop
Mode (2.04) can be used.
Drive is controlled using one command (On and Run
jointly)
Possible circuitry
On and Run can be control-
led edge-sensitively.
Stop Mode (2.03) and Eme
Stop Mode (2.04) cannot be
used, however.
You want the drive to be switched on automatically
after the electronics supply has been switched on.
1. Not possible
Since no edge-sensitive sig-
nals can be generated. The
drive will not start up even
after the electronics supply
has been switched on.
2. Possible circuitry
Since the requisite edges can
be generated by means of a
Rdy On signal when the elec-
tronics supply is switched on
or after a reset following a
fault. Stop Mode (2.03) and
Eme Stop Mode (2.04) can-
not be used, however.
Danger:
Acknowledgement of faults
occurring will switch on the
drive directly.
Switch off the drive via
6723
and
2))
command
STOP command
581
1 ==> 0
5DPS7RUTXH/LP&RDVW
Stop Mode
Brake via Ramp until
=HUR
6SHHG
= 1
Brake at Torque Limitation
until
=HUR6SHHG
= 1
Stop the current controller
alpha = 150° el (inverter stability limit)
6ZLWFKWKHGULYH2))
2))
command
ON/OFF 1 ==> 0
Delay time
(until arm. current = 0)
Open the main contactor
0DLQ&RQW2Q
= 0
Switch off fan
)DQ2Q
= 0
'ULYHLV2))
6ZLWFKWKHGULYH2))
during RUN command is still on:
Switch off the drive via
2))
command
Switch
212))
to off
ON/OFF 1 ==> 0 (RUN = 1)
Stop the current controller
(alpha = 150° el)
Delay time
(until arm. current = 0)
Open the main contactor
0DLQ&RQW2Q
= 0
Switch off fan
)DQ2Q
= 0
'ULYHLV2))
If drive trips in case of
)DXOWV
during operation
'&6
VZLWFK2))VHTXHQFH
6WRSWKHFXUUH QWFRQWUR OOHU
On
Run
Reset
+24V
Speed Ref
Eme Stop