ABB DCS 400 - Field Heating; Special Cases; Switch-On Sequence of DCS 400

II K 4-25
Overview of Software
Neither the ON nor the RUN command is active in this
phase. Only upon reaching the minimum speed, can
the drive be restarted with the rising edges of the ON
and the RUN command.
If Eme Stop Mode (2.04) = Coast is set the pulses will
be blocked, the main contactor, the fans and the field
input will be switched off and thereby the drive will be
disconnected from the mains. The drive is coasting
without control.
Neither the ON nor the RUN command is effective in
this phase. Only upon reaching the minimum speed,
can the drive be restarted with the rising edges of the
ON and the RUN command.
Special cases
When the stop command (RUN = 0) is present the
drive may change to the following events of higher
priority which may occur: Comm Fault Mode (2.07) or
Eme Stop Mode (2.04) with Eme Stop Mode being
able to interrupt Comm Fault Mode.
While the drive is being stopped in accordance with
Comm Fault Mode (2.07) or Eme Stop Mode (2.04),
an Off command (ON = 0) is prevented and vice
versa.
Coasting via field bus communication
The coast bit (COAST) in the control word allows the
drive to be de-energized as quickly as possible. The
falling edge blocks the pulses, switches off the main
contactor, the fans and the field supply and thereby
disconnects the drive from the mains. The drive is
coasting without control. The coast command
(COAST) is executed internally with the highest prior-
ity and has the same effect as emergency stop if Eme
Stop Mode (2.04) = Coast is set.
Neither the ON nor the RUN command is effective in
this phase. Only upon reaching the minimum speed,
can the drive be restarted with the rising edges of the
ON and the RUN command.
Field heating
The field heating starts 10 s after ON command
(without RUN command). The field heating will switch
on automatically 10 s after the drive is stopped (RUN=0)
and the actual speed is lower than Zero Speed Lev
(5.15). When the drive starts again (RUN=1) the drive
will switch over to nominal field current.
Fig. 4.4/1: Switch-on sequence of DCS 400
ON
Field current
RUN
Zero Speed
Fan On
10sec
10sec
Programmable Fan Delay (2.13)
)LHOGKHDWLQJ
no
no
no
6ZLWFKGULYH21
within 10 sec
5HOHDVHGULYH
'ULYHLVUHOHDVHG
212))
sequence for operation by:
- Digital Inputs
- Operating panel DCS 400PAN
- PC Tool Drive Window Light
- Fieldbus
Electronics is switched on
(no Faults, no Alarms)
Ready for ON command
5G\IRU2Q  
Switch ON/OFF to ON
212))   !
Switch Fan ON
)DQ2Q 
Switch Main Contactor ON
0DL Q&RQW2 Q 
Main Sync Fault
)DXOW
Synchronization
ok ?
Mains supply
ok ?
Field current
ok ?
Mains Undervoltage
)DXOW
Mains Overvoltage
)DXOW
Field Undercurrent
)DXOW
Ready for Run signal
5HDG\IRU5XQ 
Drive is now ready
for Run command
Switch RUN to on
581 !
Release the controller
(Current / Speed / ...)
Running signal
5XQQLQJ 
Drive is in operation
'&6
VZLWFK21VHTXHQFH
green Panel LED lights