Group 22
Quick Reference
INSTALLATION - ELECTRICAL
2
POWER QUALITY
Power quality disturbances such as power
outages, transient voltages, harmonic distortions,
and electrical noise should be accounted for
during installation of your drive. Protecting your
drive from these conditions can reduce downtime
and promote a longer lifetime for the equipment.
Following the recommendations below will
maximize the protection.
a Select wiring materials according to the correct
ampacity ratings dictated by national and local
regulations.
a Shielded, twisted pair cables can be used for
signal connections to avoid being affected by
electrical noise. These signal wires, based
on Noise Susceptibility Level (NSL) per
IEEE-518, fall into the level 1 classification.
A braided shield will be more effective than
a wrapped foil shield. Signal wire shields
should be connected to the drive casting
grounding screw. If grounding at the signal
source is required, then the shield should not
be grounded at the drive.
a Raceways such as conduits and trays have
to be grounded at both ends to properly meet
immunity requirements.
a An AC power ground connection should be
made between the power source and the
Beck drive. Grounding connections including
wire and metal conduit are permitted, except
the drive-grounding conductor may not be
connected to a structured metal frame of a
building.
a Surge suppression equipment that meets
Underwriters Laboratory (UL) Standard 1449
may be used to protect against transient
voltage conditions.
a Power Conditioners may be used to regulate
the supply voltage and maintain a constant
voltage level. They are helpful in protection
against voltage sags and swells, as well as
some measure of electrical noise protection.
a Harmonic lters may be used to minimize the
effects of supply voltage waveform distor-
tions and are used in applications that incur
a large amount of high-frequency electronic
noise.
ELECTRICAL INSTALLATION
Three 1” N.P.T. conduit connections are
provided for power and signal wiring to the
drive. One conduit is provided for signal wiring
connections, and the other conduits are provided
for power and auxiliary switch connections. Use of
a sealant on the threaded conduit connections is
recommended to keep moisture out. Routing the
conduits from below the drives will help to prevent
water and other contaminants from entering the
drive.
Power and signal wires should be routed
to the drive separately. Shielded cables are
recommended, otherwise the wires should be
installed in conductive conduit and/or cable trays.
Large, clearly labeled terminal blocks are
enclosed in a gasketed compartment. Terminals
will accommodate up to 12 AWG (3.31 mm
2
)
wires.
Refer to the wiring diagram furnished with your
Beck drive (fastened to the inside of the terminal
block cover) for proper AC power and signal
connections. It is advisable to provide normal
short circuit protection on the AC power line.
For maximum safety, the Beck drive body
should be grounded. Separate ground terminals
are provided in the wiring compartment for power
and signal wiring. Wire size 12 AWG (3.31 mm
2
)
is recommended for this purpose.
TERMINAL CONNECTIONS
The Group 22 terminal block assemblies have
screw-down clamp terminals with separation
barriers and nylon paper electrical shields (shields
not shown on terminal connection diagrams). The
terminals can accept a variety of lug types or a
bare wire. The maximum wire size capacity is #12
AWG (3.31 mm
2
).
TERMINAL SCREW TORQUES
Regardless of wire termination type, each
terminal screw should be torqued to the proper
specification upon landing your wire.
All input power terminal screws (terminals 1
to 3) on the model 22-309 and 22-409 should be
tightened to 10 lb-in. The input power terminal
screws on the model 22-809 and the optional
transformer enclosure for 22-309 and 22-409
drives should be tightened to 20 lb-in. All signal
wiring terminal screws (terminals 4 to 21) on all
Group 22 models should be tightened to 9 lb-in.
Both the power and signal ground screws should
be tightened to 20 lb-in.
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