3-8 Basic Installation MN1902
3.4 Power co n n ectio n s
This section provides instructions for connecting the AC power supply. It is important that you
refer to the correct front panel for your FlexDrive
II
package.
The installer of this equipment is responsible for complying with NEC (National Electric Code)
guidelines or CE (Conformite Europeene) directives and application codes that govern wiring
protection, earthing/grounding, disconnects and other current protection.
WARNING: Electrical shock can caus e serious or fatal injury. Do not touch any
power device or electrical connection before you first ensure that
power has been disconnected and there is no high volt age present
from this equipme nt or other equipment to which it is c onne cted.
The power supply module within all FlexDrive
II
models provides rectification, smoothing and
current surge protection. On 2.5A and 5A models a regeneration resistor (Dynamic Brake
resistor) is also built-in. The power stage is internally fused and therefore self protected, but
fuses or circuit breakers are required in the input lines for cable protection (depending on local
codes and regulations).
A power disconnect should be installed between the AC supply and the input of the FlexDrive
II
for a fail safe method to disconnect power. On models with the internally generated 24VDC
logic supply (catalog numbers FDHxxxxx -xxx0 and FPHxxxxx -xxx0), the FlexDrive
II
will
remain operational until the internal bus voltage is depleted. Position and I/O information will
then be lost. On models with an external customer supplied 24VDC logic supply (catalog
numbers FDHxxxxx -xxx3 and FPHxxxxx -xxx3), position and I/O information will be retained
while the 24V supply is present.
Note: A Residual Current Device (RCD) must not be used for fusing the drive. A circuit
breaker or fuse must be used.
All interconnection wires should be in metal conduits between the FlexDrive
II
, AC power
source, motor, host controller and any operator interface stations. Use UL listed closed loop
connectors that are of appropriate size for the wire gauge being used. Connectors are to be
installed using only the crimp tool specified by the manufacturer of the connector. Only class 1
wiring should be used.
Baldor drives are designed to be powered from standard single and three- phase lines
(depending on model) that are electrically symmetrical with respect to earth/ground. Due to
the importance of system earthing/grounding for increased reliability, earthing/grounding
methods are shown in sections 3.4.1 and 3.4.2.
Note: When using unearthed/ungrounded distribution systems, an isolation transformer
with an earthed/grounded secondary is recommended. This provides three-phase
AC power that is symmetrical with respect to earth/ground and can prevent
equipment damage.
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