
Q7 ASD Installation and Operation Manual
15
The ASD is designed to operate NEMA B motors. Consult with your sales representative before using
the ASD for special applications such as with an explosion-proof motor or applications with a piston
load.
Do Not apply commercial power to the output terminals T1/U, T2/V, or T3/W.
Disconnect the ASD from the motor before megging or applying a bypass voltage to the motor.
Interface problems may occur when an ASD is used in conjunction with some types of process
controllers. Signal isolation may be required to prevent controller and/or ASD malfunction (contact
your Toshiba sales representative or the process controller manufacturer for additional information
about compatibility and signal isolation).
Use caution when setting the output frequency. Over speeding a motor decreases its ability to deliver
torque and may result in damage to the motor and/or the driven equipment.
All Q7 ASDs are equipped with internal DC bus fuses. However, not all Q7 ASDs are equipped with
internal primary power input fuses (HP dependent). When connecting two or more drives that have no
internal fuse to the same power line as shown in
, it will be necessary to select a circuit-
breaking configuration that will ensure that if a short circuit occurs in ASD 1, only MCCB2 trips, not
MCCB1. If it is not feasible to use this configuration, insert a fuse between MCCB2 and ASD 1 (repeat
for successive ASDs).
Figure 3. Circuit breaker configuration.