Specification Sheet

2−4 Installation & Operation MN408

Conduit Box For ease of making connections, an oversize conduit box is provided. Most conduit boxes can be

rotated 360 in 90 increments. Auxiliary conduit boxes are provided on some motors for accessories

such as space heaters, RTD’s etc.

AC Power Motors with flying lead construction must be properly terminated and insulated.

Connect the motor leads as shown on the connection diagram located on the name plate or inside the

cover on the conduit box. Be sure the following guidelines are met:

1. AC power is within 10% of rated voltage with rated frequency. (See motor name plate for ratings).

2. AC power is within 5% of rated frequency with rated voltage.

3. A combined variation in voltage and frequency of 10% (sum of absolute values) of rated values,

provided the frequency variation does not exceed 5% of rated frequency.

Performance within these voltage and frequency variations are shown in Figure 2-4.

Figure 2-3 Accessory Connections

One heater is installed in each end of motor.

Leads for each heater are labeled H1 & H2.

(Like numbers should be tied together).

Three thermistors are installed in windings and tied in series.

Leads are labeled TD1 & TD2.

Winding RTDs are installed in windings (2) per phase.

Each set of leads is labeled

1TD1, 1TD2, 1TD3, 2TD1, 2TD2, 2TD3 etc.

* One bearing RTD is installed in Drive endplate (PUEP), leads

are labeled RTDDE.

* One bearing RTD is installed in Opposite Drive endplate (FREP), leads

are labeled RTDODE.

* Note RTD may have 2−Red/1−White leads; or 2−White/1−Red Lead.

TD1

TD2

Rotation All three phase motors are reversible. To reverse the direction of rotation, disconnect and lock out power

and interchange any two of the three line leads for three phase motors. For single phase motors, check

the connection diagram to determine if the motor is reversible and follow the connection instructions for

lead numbers to be interchanged. Not all single phase motors are reversible.

Adjustable Frequency Power Inverters used to supply adjustable frequency power to induction motors

produce wave forms with lower order harmonics with voltage spikes superimposed. Turn−to−turn,

phase−to−phase, and ground insulation of stator windings are subject to the resulting dielectric stresses.

Suitable precautions should be taken in the design of these drive systems to minimize the magnitude of

these voltage spikes. Consult the drive instructions for maximum acceptable motor lead lengths, and

proper grounding.