Drive and Motor Connection
• The motor should be connected to the SRC 311 U, V, and W terminals using a suitable
3 or 4 core cable. Where a 3 core cable is utilised, with the shield operating as an earth
conductor, the shield must have a cross sectional area at least equal to the phase
conductors when they are made from the same material. Where a 4 core cable is
utilized, the earth conductor must be of at least equal cross sectional area and
manufactured from the same material as the phase conductors.
• The motor earth must be connected to one of the SRC 311 earth terminals.
• For compliance with the European EMC directive, a suitable screened (shielded) cable
should be used. Braided or twisted type screened cable where the screen covers at
least 85% of the cable surface area, designed with low impedance to HF signals are
recommended as a minimum. Installation within a suitable steel or copper tube is
generally also acceptable.
• The cable screen should be terminated at the motor end using an EMC type gland
allowing connection to the motor body through the largest possible surface area
• Where drives are mounted in a steel control panel enclosure, the cable screen may be
terminated directly to the control panel using a suitable EMC clamp or gland, as close
to the drive as possible.
• For IP55 drives, connect the motor cable screen to the internal ground clamp
Motor Terminal Box Connections
Most general purpose motors are wound for operation on dual voltage supplies.
This is indicated on the nameplate of the motor This operational voltage is normally
selected when installing the motor by selecting either STAR or DELTA connection. STAR
always gives the higher of the two voltage ratings.
230
230 / 400
Delta
400
400 / 690
400
230 / 400
Star
Control Terminal Wiring
• All analog signal cables must be screened. Twisted-pair cables are recommended.
• Power and control signal cables should must be routed separately where possible, and
must not be routed parallel to each other.
• Maximum control terminal tightening torque is 0.5Nm.
Installation
12
SRC 311 - SmartRun
™
User guide
