Baldor MicroFlex, Installation Manual

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Basic Installation 3-11 MN1919
3.4.2 Single-phase or three-phase power connections
Location Connector X1 (Mating connector: Phoenix COMBICON
MSTB 2,5HC/11-ST-5,08)
Nominal input voltage 115VAC or 230VAC, 1 Φ or 3 Φ line to line
Minimum input voltage 105VAC, 1 Φ or 3 Φ line to line (see Note*)
Maximum input voltage 250VAC, 1 Φ or 3 Φ line to line
Note: * The MicroFlex will operate at lower input voltages, although performance could
be impaired. The drive will trip if the DC-bus voltage falls below 50V or 60% of the
no-load voltage, whichever occurs first.
For three phase supplies, connect supply to L1, L2 and L3 as shown in Figure 3. For single
phase supplies, connect the supply between any two line inputs, for example L1 and L2.
For CE compliance, an AC filter must be connected between the AC power supply and the
MicroFlex. If local codes do not specify different regulations, use at least the same gauge wire
for earth/ground as is used for L1, L2 and L3.
Tightening torque for terminal block connections is 0.5-0.6Nm (4.4-5.3 lb-in). The threaded
hole in the top and bottom of the case may be used as an additional functional earth/ground
connection for signals on connector X3. They may also be used to attach shield or strain relief
clamps. The holes are threaded for M4 bolts no longer than 11mm (0.43 in) in length.
To earth/ground outer shield,
use 360° clamps connected
to enclosure backplane
AC
Supply
Line (L1)
Route L1, L2, L3 and
earth/ground together
in conduit or cable
Circuit breaker or fuses.
See section 3.4.4
AC filter.
See section
3.4.7
Line (L2)
Line (L3)
STAR POINT
Incoming safety
earth/ground (PE)
Isolating switch
Connect
earth/ground
to protective
earth on top of
drive
Figure 3 - Single or three-phase power connections