Delta Compact Drive MS300 IP66/NEMA 4X Series User Manual page 37

Open the front cover
 Open the front cover before connecting the main circuit terminals and control circuit terminals. Open
the cover according to the Figure 5-4 and Figure 5-5 below.
 The figure below shows the Frame B model for example. Opening the cover on the other frame sizes
is similar.

Loosen the four screws on the front
cover with a Phillips head screwdriver.
Torque:
4–6 kg-cm /
[3.5–5.2 lb-in.] /
[0.39–0.59 Nm]
Chapter 5 Main Circuit TerminalsMS300 (IP66 / NEMA 4X)
Terminals for connecting DC reactor, external brake resistor and DC
circuit
Terminals for connecting the DC reactor, as shown in Figure 5-2 below, are

to improve the power factor and harmonics. At delivery they are shorted by
a jumper. Remove the jumper before connecting the DC reactor.
You must tightly fasten the jumper when it does not connect the DC reactor,

use DC+/+1, +2/B1 to execute common DC BUS, or connect with a brake
resistor; otherwise the drive might lose power or break the terminals. Refer
to Figure 5-2.
Connect a brake resistor in applications with frequent deceleration, short

deceleration time, too low braking torque, or increased braking torque.
Connect the external brake resistor to the terminals [+2/B1], [B2] on AC

motor drives.
DO NOT short-circuit or connect a brake resistor directly to DC+/+1 and

DC-, +2/B1 to DC-; otherwise the drive will be damaged.
Connect DC+ and DC- in common DC BUS applications. Refer to Section

5-1 (Main Circuit Terminal) for the wiring terminal specification and the wire
gauge information.
Figure 5-4
DC react or optional
DC +/+1 +2 /B1
Brake res istor
(optional)
+2/B1

Open the front cover to the left.
5-3
( )
Figure 5-2
Figure 5-3
B2
Figure 5-5