Chapter 5 Main Circuit TerminalsMH300
Securely fasten the main circuit terminal screws to prevent sparking caused 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 resistors directly to +1/DC+ to DC-, +2/B1 to DC- to prevent
damage to the drive.
Ensure proper insulation of the main circuit wiring in accordance with the relevant
safety regulations.
R/L1, S/L2 and T/L3 have no phase-sequence requirement; they can be connected
in any sequence.
Add a magnetic contactor (MC) at the power input to quickly cut off power and
reduce malfunction when activating the AC motor drive protection function. Both
ends of the MC should have an R-C surge absorber.
Ensure that voltages and currents are within specification.
Although the leakage current of one single MH300 drive is less than 10 mA d.c.,
electric shock may still occur due to the leakage current from other equipment such
as motors and leads. Therefore, it is recommended that you install one of the
followings to prevent danger caused by electric shock.
1. Use a copper wire with a cross-section of 10 mm
2
or above or an aluminum wire
of 16 mm
2
as the connection between the casing and the ground.
2. Install an Earth Leakage Circuit Breaker (ELCB).
Due to the high frequency current of the leakage current of the AC motor drive,
select a Type B ELCB specifically for the drive when using an ELCB. For tripping or
malfunctions on the usage of ELCB, refer to Section 7-8 Capacitive Filter for details.
The power system of the AC motor drive affects the power factor, so select a MCCB
with larger capacity.
Use conduits or shielded cables for the power wiring, and ground both ends of the
conduit or shielded cables.
DO NOT start or stop the drive by turning the power ON or OFF. Start and stop the
drive with the RUN / STOP command. If you still need to run or stop the drive by
turning the power ON or OFF, it is strongly recommended that you do so no more
often than ONCE per hour.
To comply with UL standards, connect the drive to a three-phase three-wire or three-
phase four-wire Wye system type of mains power system.
Output terminals for main circuit
Use a well-insulated motor that is suitable for operation with an inverter.
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 rotates
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