Shield Termination (Cable Screen)
The safety ground terminal provides a grounding point for the motor cable shield. The
motor cable shield connected to this terminal (drive end) should also be connected to the
motor frame (motor end). Use a shield terminating or EMI clamp to connect the shield to
the safety ground terminal.
Wiring Precautions
Connect the SRC 311 according to
(page 12) and
(page 12), ensuring that motor terminal box connections are
correct. There are two connections in general: Star and Delta. It is essential to ensure that
the motor is connected in accordance with the voltage at which it will be operated. For
more information, refer to
Motor Terminal Box Connections
(page 12).
It is recommended that the power cabling should be 4-core PVC-insulated screened cable,
laid in accordance with local industrial regulations and codes of practice.
Incoming Power Connection
• For a single phase supply, power should be connected to L1/L, L2/N.
• For 3 phase supplies power should be connected to L1, L2, and L3. Phase sequence is
not important.
• For compliance with CE and C Tick EMC requirements, a symmetrical shielded cable is
recommended.
• A fixed installation is required according to IEC61800-5-1 with a suitable disconnecting
device installed between the SRC 311 and the AC Power Source. The disconnecting
device must conform to the local safety code / regulations (e.g. within Europe,
EN60204-1, Safety of machinery).
• The cables should be dimensioned according to any local codes or regulations.
Guideline dimensions are given in
Output power and current ratings
(page 18).
• Suitable fuses to provide wiring protection of the input power cable should be
installed in the incoming supply line, according to the data in
(page 18). The fuses must comply with any local codes or regulations
in place. In general, type gG (IEC 60269) or UL type T fuses are suitable; however in
some cases type aR fuses may be required. The operating time of the fuses must be
below 0.5 seconds.
• Where allowed by local regulations, suitably dimensioned type B MCB circuit breakers
of equivalent rating may be utilized in place of fuses, providing that the clearing
capacity is sufficient for the installation.
• When the power supply is removed from the drive, a minimum of 30 seconds should
be allowed before re-applying the power. A minimum of 10 minutes should be
allowed before removing the terminal covers or connection.
• The maximum permissible short circuit current at the SRC 311 Power terminals as
defined in IEC60439-1 is 100kA.
• An optional Input Choke is recommended to be installed in the supply line for drives
where any of the following conditions occur:
• The incoming supply impedance is low or the fault level / short circuit current is high
• The supply is prone to dips or brown outs
• An imbalance exists on the supply (3 phase drives)
• The power supply to the drive is via a busbar and brush gear system (typically
overhead Cranes).
• In all other installations, an input choke is recommended to ensure protection of the
drive against power supply faults.
• SRC 311 models in frame sizes 4 to 6 are factory fitted with an Input choke as standard.
Installation
SRC 311 - SmartRun
™
User guide
11
