4-18 1000 Series / Guide to Installation, Troubleshooting, and Maintenance
4.5.2 Connect the Power Supply
Connect the line power supply leads to the 1100, 1105, 1110, 1130, 1200, and 1230
drives using the appropriate connection diagram as listed in Table 4-1. Depending upon
the drive model and its power rating, the drive may accept either a single-phase (S, T), a
three-phase (R, S, T), or a six-phase (R1, R2, S1, S2, T1, T2) input. If six-phase (12-
pulse) operation is unnecessary, six-phase drives may also be configured for three-phase
(six-pulse) operation. Refer to the appropriate connection diagram as listed in Table 4-1.
Input connection terminal specifications for the various drives are provided in the tables
summarized in Table 4-1. Large drives use double terminals (indicated by x2) to
accommodate the maximum required currents. High-power drive sizes provide for
optional six-phase (12-pulse) connection and, therefore, also have double terminals
(indicated x2). Refer to Section 4.2 for wiring requirements. The inverter is phase-
sequence insensitive, so the input leads may be connected in any order. Make certain that
AC power inputs are routed separately from control signals.
4.5.3 Input Protection
The 1100, 1105, 1110, 1130, 1200, and 1230 drives must be protected from short circuits
using either a circuit breaker or fusing.
Fuses are not supplied with the unit and must be provided externally. Fuse
recommendations and specifications are provided in
Table 4-11 (1100, 1105, 1130, 1200, and 1230 drives) and Table 4-12 (1110 drives).
Select fuses according to the power of the application, not necessarily according to the
drive rating. For example, a drive rated 40 hp CT can also be applied at 50 hp VT or 60
hp ET, depending upon the overload requirements of the application. The nominal ratings
of the drive can be found on the rating label. Fuse recommendations differ for single-,
three-, and six-phase configurations. The recommended fuse ratings for the six-phase
(twelve-pulse) connections are 60% of those listed for the three-phase (six-pulse)
connection in
Table 4-11.
Fuses from other manufacturers may be used as long as they meet the specifications
given. Semiconductor fuses provide the highest level of protection and are recommended.
UL-listed drives must use UL-recognized fuses under category JFHR2. For help in
locating additional UL-recognized fuse manufacturers, please contact the factory.
If a circuit breaker is to be used, refer to
Table 4-11 (1100, 1105, 1130, 1200, and 1230 drives) or Table 4-12 (1110 drives) to
determine the proper current rating using the input current and applying a margin of
approximately 33%. You may purchase a circuit breaker directly from Unico. Contact the
factory directly for more information.
4.6 Connect the Motor
Connect the motor leads using the appropriate connection diagram as listed in Table 4-1.
Motor output terminal specifications for the various drives are provided in the tables
summarized in Table 4-1. High-power drives have two terminals per motor phase
(indicated x2) to provide for convenient wire gauges. Refer to Section 4.2 for wiring
requirements. Use of a metal-jacketed motor cable is recommended to minimize noise
emissions. Refer to Table 2-13 to determine the output current rating of the drive.
If the motor has a transducer, the motor leads may be connected in any order and the
drive will determine the correct phasing accordingly. If the motor does not have a
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