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Safety Considerations
The user is responsible for emergency interlock switches. Any master interlock should be wired
to shut down AC power to all parts of the system. Your system should be designed such that
power is disconnected from the output loads any time the equipment is not running, or when the
emergency stop is activated.
Brake Option
An additional safety and operational feature can be added by ordering the optional fail-safe
brake. The brake allows the motor shaft to be held whenever power is removed from the brake
coil (such as in a power failure). The user can control the on/off operation of the brake through
either serial commands or an assigned input line. The power supply needed to operate the brake
is provided internally in the drive.
Power Line
The lower power 120 VAC (DX-202 thru DX-7120) drives are designed to operate on a 50/60
Hz, single phase AC power line. The AC voltage of this power line must be within the specified
range of 96-132 VAC and be free of voltage transients which exceed this range. If it is found
that the AC power does not meet these specifications, further AC line conditioning may be
required. Also, if there is sensitive electronic equipment (digital computer, test equipment, etc.)
operating on the same AC power line as the Drive, additional EMI/RFI filtering may be required
to reduce the effects of conducted AC line noise. Operation at 96 VAC will reduce the drive’s
performance at high (max) speed.
The AC input lines are connected to the drive by means of the 3-position terminal strip located
on the bottom plate of the drive. The AC line wires should be connected as shown below.
Insufficient or incorrectly applied AC line power is a major cause of drive problems. Wiring
sizing and transformer selection (if necessary) should be done carefully.
CAUTION:
To insure proper operation after a power down the user should wait a minimum of
10 seconds before reapplication of power.
Figure 10
Typical 120 VAC Drives
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L2 is the AC neutral wire and must be grounded (see “Grounding Considerations”.)
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