Baldor E100 manual Input power conditioning

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3.4.3 Input power conditioning

Certain power line conditions must be avoided; an AC line reactor, an isolation transformer or a step up/step down transformer may be required for some power conditions:

HIf the feeder or branch circuit that provides power to the MicroFlex e100 has permanently connected power factor correction capacitors, an input AC line reactor or an isolation transformer must be connected between the power factor correction capacitors and the MicroFlex e100 to limit the maximum symmetrical short circuit current to 5000A.

HIf the feeder or branch circuit that provides power to the MicroFlex e100 has power factor correction capacitors that are switched on line and off line, the capacitors must not be switched while the drive is connected to the AC power line. If the capacitors are switched on line while the drive is still connected to the AC power line, additional protection is required. A Transient Voltage Surge Suppressor (TVSS) of the proper rating must be installed between the AC line reactor (or isolation transformer) and the AC input to the MicroFlex e100.

3.4.3.1Input power-cycling and inrush

If AC power has been removed from the MicroFlex e100, it should remain disconnected for the period specified in Table 1, before it is reapplied.

MicroFlex e100	Minimum power cycle delay period
current rating	(seconds)
3A	25
6A	45
9A	65

Table 1 - Power cycle intervals

This delay allows the input surge protection circuit to perform correctly, ensuring that the inrush current (typically 1.7A) is below the drive rated current. Power-cycling the drive more frequently could cause high inrush current and corresponding nuisance operation of circuit breakers or fuses. Repeated failure to observe the delay period could reduce the lifetime of the MicroFlex e100.

3.4.3.2 Discharge period

DANGER: After AC power has been removed from the MicroFlex e100, high voltages (greater than 50VDC) can remain on the regeneration resistor connections until the DC-bus circuitry has discharged. The high voltage can remain for the period specified in Table 2.

MicroFlex e100	Time for DC-bus to discharge to 50V or less
current rating	(maximum, seconds)
3A	83
6A	166
9A	248

Table 2 - DC-bus discharge periods

MN1942 Basic Installation 3-13