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BasicInstallation 3-13MN1942

3.4.3 Input power conditioning
Certainpow er line conditions must be avoided; an AC line reactor, an isolation transformer or a
stepup/s tep 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 A C line reactor or an isolation
transformer must be connected between the power fac tor correction capacitors and the
MicroFlex e100 to limit the maximum symmetrical short circuit c urrent to 5000A.
HIf the feeder or branch circuit that prov ides power to the MicroFlex e100 has power f actor
correction capacitors that are switched on line and off line, the capacitors must not be
switchedwhile the dr ive is connected to the AC power line. Ifthe c apacitors are switched on
linew hile 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.
3.4.3.1 Input pow er-cycling and inrush
IfAC pow er has been removed from the MicroFlex e100, it should remaindisconnected forthe
periodspec ified in Table1, before it is reapplied.
MicroFlexe100
currentrating
Minimumpow er cycle delay period
(seconds)
3A 25
6A 45
9A 65
Table1 - Power cycle int ervals
Thisdelay allowsthe input surge protect ion circuit to perform correctly, ensuring that the inrush
current(ty pically 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 Dischargeperiod
DANGER: After AC power has beenremoved from the MicroFlex e100, high voltages
(greatert han 50VDC) can remain on the regeneration resistor connections
untilt he DC-bus circuitry has dis charged. The high voltage can remain for
theperiod spec ified in Table2.
MicroFlexe100
currentrating
Timefor DC -bus to discharge to 50V or less
(maximum,s econds)
3A 83
6A 166
9A 248
Table2 - DC-bus discharge periods