Delta VFD11AMS21AFSHA, User Manual

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Chapter 5 Main Circuit Terminals

MS300
(High Speed Model)
5-2
DANGER
 Fasten the main circuit terminal screws to prevent sparking by loose screws
due to vibration.
 When needed, only use an inductive filter at the motor output terminals
U/T1, V/T2, W/T3 of the AC motor drive. DO NOT use phase-compensation
capacitors or L-C (Inductance-Capacitance) or R-C
(Resistance-Capacitance), unless approved by Delta.

DO NOT connect brake resistor directly to +1/DC+ to DC-, +2/B1 to DC- to
prevent damage to the drive.
 Ensure proper insulation of main circuit wiring in accordance with the
relevant safety regulations.
Main power terminals
 R/L1, S/L2 and T/L3 have no phase-sequence requirement; they can be
connected in any sequence.
 It is recommended adding a magnetic contactor (MC) at the power input to
cut off power quickly and reduce malfunctioning when the protection
function of the AC motor drive is activated. Both ends of the MC should have
an R-C surge absorber.

Please ensure voltages and currents are within specification.
 When using a general GFCI (Ground Fault Circuit Interrupter), select a
sensitivity ≥ 200 mA and ≥ 0.1 s operation time to avoid nuisance tripping.
 Please use conduits or shielded cables for the power wiring and ground
both ends of the conduit or shielded cables.

DO NOT run/stop the drive by turning the power ON/OFF. Run/stop the
drive by RUN/STOP command. If you still need to run/stop the drive by
turning power ON/OFF, it is strongly recommended to do so only ONCE per
hour.
 To comply with UL standards, connect the drive to a 3WYE type of mains
power system.
Output terminals for main circuit

Use a well-insulated motor, suitable for inverter operation.
 When the AC drive output terminals U/T1, V/T2, and W/T3 are connected to
the motor terminals U/T1, V/T2, and W/T3 respectively, the motor will rotate
counterclockwise (as viewed on the shaft end of the motor) when a forward
operation command is received. To permanently reverse the direction of
rotation, switch over any two motor leads.
Fo wa rd
Running