Delta MS300 Series User Manual page 36

Output terminals of the main circuit
 Use well-insulated motors to prevent any electric leakage from motors.
 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 FWD LED indicator on the
digital keypad is ON. This means the AC motor drive executes running forward,
and the motor rotates counterclockwise (viewed from the shaft end of the motor, as
shown in Figure 5-1).
On the contrary, when the REV LED indicator lights, the AC motor drive executes
running in reverse, and the motor rotates in an opposite direction to Figure 5-1. If
the AC motor drive executes running forward but the motor rotates in a reverse
direction, exchange any two of the U/T1, V/T2 and W/T3 motor leads.
Terminals for connecting DC reactor, external brake resistor and DC circuit
 Use the terminals, as shown in Figure 5-2, to connect a DC reactor to improve the
power factor and reduce harmonics. A jumper is connected to these terminals at
the factory. Remove that jumper before connecting to a DC reactor.
Tighten the jumper if a DC reactor is not connected and DC+/+1 and +2/B1

terminals are used for common DC bus or brake resistors in order to prevent the
AC motor drive from losing power and damage to the terminals. If the jumper is
missing due to wiring, refer to the recommended main circuit terminal wire gauge
mentioned in Section 5-2 to short-circuit the DC+/+1 and +2/B1 terminals.
 Install an external brake resistor for applications in frequent deceleration to stop,
short deceleration time (such as high frequency operation and heavy load
operation), too low braking torque, or increased braking torque.
Chapter 5 Main Circuit TerminalsMS300
Figure 5-1
Figure 5-2
Figure 5-3
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