62 Main features CG Drives & Automation, 01-5980-01r2
7.5.2Enable and Stop functions
Both functions can be used separately or simultaneously.
The choice of which function is to be used depends on the
application and the control mode of the inputs (Level/Edge
[21A]).
Enable
The enable function is used as a start interlock. This means
that if any input is set to “Enable”, this input must be set to
active (high) to allow any run command. When the input is
low, the motor will coast to stop.
Stop
If the input is set low (open), the softstarter will stop
according to the selected stop method in menu [341].
7.5.3Level / Edge operation after
reset
If the softstarter is in stop mode due to a trip condition, the
softstarter can be remotely reset by a pulse (“low” to “high”
transition) on the “Reset” input on DigIn 4.
Depending on the selected control method, a restart takes
place as follows:
Edge controlled “Run” inputs
After the “Reset” command is given a new “Run” command
must be applied to start the softstarter again. The inputs are
set for edge control as default. This means that an input is
activated by a “low” to “high” transition or vice versa.
The “Enable” and “Stop” inputs must be closed
continuously in order to accept any run forward or run
reverse command. The last edge (RunFWD or RunREV) is
valid. If an edge-controlled start is activated it is also
necessary to use an input for the stop command according to
Fig. 44, page 61. Fig. 45 gives an example of a possible
sequence.
Fig. 45 Input and output status for edge control
Level controlled “Run” input
If the “Run” input remain in its position the softstarter will
start immediately after the “Reset” command is given.
Autoreset is enabled if the “Reset” input is continuously
active. The autoreset functions are programmed in menu
“Autoreset” [240].
Menu “[21A] Level/Edge” must be set to “Level” to activate
level control. This means that an input is activated by
making the input continuously high. This method should
be applied if a PLC is used to operate the softstarter, for
instance.
The Enable input must be continuously active in order to
accept any run forward or run reverse command. If both
RunFWD and RunREV inputs are active, then the
softstarter stops according to the selected stop method in
menu [341]. Fig. 46 gives an example of a possible sequence.
NOTE: In edge control mode, at least one digital input
must be programmed to “Stop”, because the “RunFWD”
and “RunREV” commands are only able to start the
softstarter.
CAUTION!
If the Enable function is not programmed to
a digital input, it is considered to be active
internally.
NOTE: Edge controlled inputs comply with the Machine
Directive (see Chapter 1.5.1, page 6), if the inputs are
directly used for starting and stopping the machine.
NOTE: If the control commands are programmed for
keyboard control or serial communication control,
autoreset is not possible.
CAUTION!
Level-controlled inputs DO NOT comply with
the Machine Directive, if the inputs are
directly used to start and stop the machine.
INPUTS
Enable
Stop
Run FWD
Run REV
Forward rotation
Reversed rotation
MOTOR OPERATION
Edge control [21A]
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