Planning the electrical installation
54
3ADW000462R0401 DCS880 Hardware manual e d
Start, Stop and E-Stop control
The relay logic is splitted into four parts:
1: Generation of the On / Off and Start / Stop commands:
The commands represented by K20 and K21 (latching interface relays) can also be generated by a
PLC and transferred to the terminals of the converter either by relays, using galvanic isolation or
directly via 24 V signals.
There is no need to use hardwired signals. Transfer these commands via serial communication. Even
a mixed solution can be realized by selecting different possibilities for the one or the other signal (see
parameter groups 06 and 20):
2: Generation of control and monitoring signals:
Control the mains contactor (K1) of the armature circuit by the relay contact of XSMC. The status of
the drive and / or motor fans (K8) can be monitored by means of 20.38 Drive fan acknowledge source
and 20.39 Motor fan acknowledge source.
3: Off2 (emergency off / electrical disconnect / fast current off) and Off3 (emergency stop):
Beside
On / Off
and
Start / Stop
the drive is equipped with two additional stop functions
Off2
and
Off3
according to Profibus standard.
Off3
is scalable via 21.03 Emergency stop mode to perform a stop according to category 1. Connect
this function to the E-stop push button (off3) without any time delay. In case of 21.03 Emergency stop
mode = Ramp stop the timer relay (K15) must be set longer than 23.23 Emergency stop time. For
21.03 Emergency stop mode = Coast stop
the drive opens the mains contactor immediately.
Off2
switches the DC current off as fast as possible and prepares the drive to open the mains
contactor or drop the mains supply. For a normal DC motor load the time to force the DC current to
zero is below 20 ms. This function should be connected to all signals and safety functions opening
the mains contactor. This function is important for 4-Q drives. Do not open mains contactor during
regenerative current. The correct sequence is:
1. Switch off regenerative current.
2. Then open the mains contactor.
In case the E-stop push button is hit, the information is transferred to a digital input of the converter.
In case 21.03 Emercency stop mode = Ramp stop or Torque limit the converter will decelerate the
motor and then open the mains contactor. If the drive has not finished the function within the timer
relay (K15) setting, the drive must get the command to switch off the current via timer relay (K16).
After the timer relay (K16) has elapsed, the mains contactor is opened immediately, independent of
the drive's status.
06.01 Main control word
SF_DCS_001_ctrl-cmd_b.ai
06.09 Used main control word
Local I/O
20.01 Command location
PC tool or panel
Local / Remote
On
Run
Reset
On
On
Run
Reset
Reset
Run
PLC
