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Ungrounded distribution systems
To avoid equipment damage an isolation transformer with a grounded secondary is recommended.
This provides three phase AC power that is symmetrical with respect to ground.
2.3.2 Input power conditioning
Baldor drives are designed for direct connection to standard single and three phase lines that are
electrically symmetrical with respect to ground. 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.
H If the feeder or branch circuit that provides power to the MintDrive 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 MintDrive.
H If the feeder or branch circuit that provides power to the MintDrive has power factor correction
capacitors that are s witched 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 MintDrive.
2.3.3 Power disconnect an d protection d evices
A power disconnect should be installed between the input power service and the MintDrive for a
fail-safe method to disconnect power. The MintDrive will remain in a powered condition until all input
power is removed from the drive and the internal bus voltage has depleted.
The MintDrive must have a suitable input power protection device installed. Recommended circuit
breakers are thermal magnetic devices (1 or 3 phase as required) with characteristics s uitable for heavy
inductive loads (D-type trip characteristic). Recommended time delay fuses are Buss FRN on 230VAC
or equivalent, following the UL 508C recommendation of a fuse size of four times the continuous output
current of the drive. Dual element, time delay fuses should be used to avoid nuisance trips due to inrush
current when power is first applied.
For CE installations the Gould Shawmut Cat. No. ATMR15 may be suitable, up to 15A.
LN
Fuse
Connection
L
N
LN
Earth
MintDrive
Circuit
Breaker
Circuit breaker and fuse not supplied.
For CE Compliance, see Appendix C.
LN
Figure 4 - Circuit breaker and fuse, single phase, package size A or B