Klockner Moeller Electric Parts from KlocknerMoeller.net
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Representing
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Electronic motor starters and
drives
Connection examples, DS4
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| Bypass connection,
single direction of rotation |
Caution!
The DS4-...-MX(R) devices have built-in bypass contacts. The examples
below therefore apply only for DS4-...-M. If an external bypass for
devices with reversing function (DS4-...-MR) is to be fitted, you must
include an additional bypass contactor is required the second direction
of rotation as well as additional interlocks to prevent a short-circuit
through the bypass contactors.
The bypass connection allows a direct connection of the motor to the
mains to suppress heat dissipation through the soft starter. The bypass
contactor is actuated once the soft starter has completed the
acceleration phase (i.e. once mains voltage is reached). By default, the
Top-of-Ramp function is mapped to relay 13/14. The soft starter controls
the bypass contactor so that no further user action is required. Because
the bypass contactor is switched only at zero current and does not,
therefore, have to switch the motor load, an AC1 layout can be used.
Suitable bypass contactors are listed in appendix “Technical data”.
If an Emergency-Stop requires an immediate disconnection of the voltage,
the bypass may have to switch under AC3 conditions (for example if the
Enable signal is removed with a command or the soft stop ramp time is
0). In this case, the circuit must be laid out so that either a
higher-priority isolating element trips first or the bypass must be laid
out to AC3.
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S3 = Soft start/stop
Q1 = Line protection
Q21 = Bypass contactor
F1 = Overload relay
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F2 = Semiconductor fuse for type “2” coordination, in addition to Q1
T1 = Semiconductor contactor
M1 = Motor
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