Emerson SKA1100025 Getting Started Manual page 15

The braking terminals are not available on the size A 110V drive.
NOTE
On the Commander SKB 110V drives, the -DC bus (-) terminal has no internal
NOTE
connection.
Fuses/MCB
The AC supply to the drive must be installed with suitable protection against overload
and short circuits. Failure to observe this requirement will cause risk of fire.
See the Commander SK Technical Data Guide for fuse data.
WARNING
The drive must be grounded by a conductor sufficient to carry the prospective fault
current in the event of a fault. See also the warning in section 4.2 Ground leakage
relating to ground leakage current.
WARNING
To avoid a fire hazard and maintain validity of the UL listing, adhere to the specified
tightening torques for the power and ground terminals. Refer to the table below.
WARNING
Frame size
A
B, C and D
4.1.1 Starts per hour
Electric starts
With the supply permanently connected the number of electronic motor starts per hour
is only limited by motor and drive thermal limits.
Power starts
The number of starts by connection of the AC supply is limited. The start up circuit will
allow for three consecutive starts at 3 second intervals on initial power up. Exceeding
the rated number of starts per hour, presented in the table below, could result in damage
to the start up circuit.
Frame size
A to D
Braking resistor: High temperatures and overload protection
Braking resistors can reach high temperatures. Locate braking resistors so that damage
cannot result. Use cable having insulation capable of withstanding the high temperatures.
WARNING
It is essential that the braking resistor be protected against overload caused by a failure
of the brake control. Unless the resistor has in-built protection, a circuit like those shown
in Figure 4-1 and Figure 4-2 should be used, where the thermal protection device
disconnects the AC supply to the drive. Do not use AC relay contacts directly in series
with the braking resistor circuit, because it carries DC.
When connecting single phase to a dual rated 200V unit, use terminals L1 and L3.
NOTE
For control terminal connections, see Pr 05 on page 26.
NOTE
For information on the internal EMC filter, see section 4.3.1 Internal EMC filter .
NOTE
Commander SK Getting Started Guide
Issue Number: 9
Maximum power terminal screw torque
0.5 N m / 4.4 lb in
1.4 N m / 12.1 lb in
Maximum AC line starts per hour evenly spaced
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in time
20
15