Siemens 680 - Manual (Page 7)

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Installation
External Wiring
DANGER
Hazardous voltage.
Will cause death, serious injury,
electrocution or property damage.
Disconnect all power before working on
this equipment.
NOTE
Before running motor, see Initial Start.
Starting and overload control devices must be matched
to motor rating. For safety or convenience they may
need to be installed some distance from the motor.
Follow the control manufacturer’s instructions to make
proper installations and connections. Observe the
following:
1. Connect electrical power supply to conform with
National Electric Code and any local regulations.
Line voltage and wire capacity must match motor
rating stamped on the nameplate.
2. With the driven equipment disconnected,
momentarily energize the motor to check rotation.
3. If motor is three-phase type, reverse rotation (if
required) by interchanging any two of the three
power leads.
Changing Direction of Rotation
Look for rotation plates usually mounted on opposite
drive end of the motor.
CAUTION
Excessive heat.
Motor may overheat if motor cooling fans run in the
wrong direction.
Run motor in direction shown on motor or change fans.
The internal rotor fan direction must be considered if
changing direction of rotation. See the following
Internal Rotor Cooling Fan table to identify which
motors have directional fans.
In addition, for Type CAZ motors with shaft mounted
external cooling fan, the fan is directional and must be
replaced with a fan designed for the desired direction
of rotation.
Internal Rotor Cooling Fan
Motor Speed
(No. of poles)
3600 – 3000 RPM
(2 pole)
1800 RPM & Slower
(4 or more poles)
Rotor Material Aluminum Copper Aluminum Copper
500, 580
Frames
1 4 3 3
680, 800
Frames
N/A 4 N/A 3
1120 Frame N/A N/A N/A 2
1. Inspect rotor to determine whether alternative A or B
below applies;
A. If the rotor has integrally cast directional fans,
either rotor machining instructions and
conversion parts can be purchased from the
factory or the rotor core may be removed from
the shaft, switched end-for-end, and
remounted on the shaft.
B. If the rotor has shaft-mounted directional fans,
the fans must be interchanged end-for-end.
2. Replace single directional rotor fan with one for the
opposite direction.
3. Fans are bi-directional which allows motor rotation in
either direction without mechanical modification.
4. The single directional rotor fans must be interchanged
end-for-end.
NOTE
It will be necessary to rebalance the rotor if the fans are
changed.
Alignment
Accurate shaft alignment between motor and driven
equipment is essential. Improper alignment may result
in vibration, bearing overloads and excessive shaft
stresses. Flexible couplings will not compensate for
excessive misalignment.
NOTE
A basic rule is to not have more than five shims in a shim
pack under any one motor foot. Thick shim packs
consisting of many thin shims will cause soft foot,
excessive vibration or twisted frame (motor foot out of
plane).
Parallel Alignment
After positioning unit for correct end float, separate the
coupling halves and mount a dial indicator rigidly on
one coupling half with the button on the cylindrical
surface of the other half. Rotate the shafts together,
and take readings at top, bottom and side positions.
Align shaft so difference between top and bottom
readings and the side readings is a maximum of
0.002 inch for a flexible coupling.