Opening Control Of The Contactors; Run Control - ABB DCS 500B Description

Opening Control
of the Contactors

Run Control

DCS 500 Software Description
If the signal [ON/OFF] (901) changes from 1 to 0 (edge sensitive),
the drive will block the controllers immediatelly and start a delay
time. Because of the regulator blocking the armature and field cur-
rent will be forced to zero. When the delay time has elapsed the
outputs for handling the contactors will be set to 0; the contactors
should drop off.
This input has the second highest priority. The sequence described
before will be worked out independant from the drive condition
(with / without speed; with / without armature current).
In case of tripping, the fan, field and main contactors are opened in
a certain order which depends on the type of the fault. Fault acti-
vates the output FAULT (10904) to logical state 1.
If a motor or converter overtemperature fault is detected, the out-
puts for handling the cooling fans are kept high until the measured
temperature has decreased below the alarm level.
The drive will accept a reset-command, when the temperature has
decreased below the fault level. In this case the outputs for the fan
contactors will be reset.
There are 3 different types of faults:
- Faults which trip the main contactor:
- Faults which trip main contactor and field contactor
- Faults which trip main contactor, field contactor and fans
for more detailed information, please see
manual
The input START_INHIBIT] (908) has the highest priority. If this
input is set to 1, the outputs for the handling of the contactors can
never be forced to level 1, if the drive is at standstill. If the drive is
running and the input is set to 1, the drive will act in the same way
as if [ON/OFF] (901) is set to 0. Afterwards the drive cannot be
switched on as long as START_INHIBIT (908) has logic 1 level.
When dynamic braking is used (output DYN BRAKE ON (10912)),
an external resistor is connected in parallel with the armature
module. If the drive trips, the field of the motor must be maintained,
otherwise the resistor cannot produce fast deceleration.
When RDY RUNNING (10901) = 1, the drive can be started by
setting either input [RUN1] (901), [RUN2] (902) or [RUN3] (903) to
state 1. The drive releases the references and controllers and sets
the RUNNING (10903) signal to logical state 1. Another way to
start the drive is by Control Panel CDP312 in local mode using the
start button.
Functional Software description
OPERATING INSTRUCTION
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