User Manual High Performance AC Drive

Installation/Wiring 1-17Using Input/OutputContactors!!ATTENTION: A contactor or other device that routinelydisconnects and reapplies the AC line to the drive to start and stopthe motor can cause drive hardware damage. The drive isdesigned to use control input signals that will start and stop themotor. If an input device is used occasionally, an auxiliary contacton that device should also be wired to a digital input programmedas a “Enable” function. The input device must not exceed oneoperation per minute or drive damage will occur.ATTENTION: The drive start/stop control circuitry includessolidstate components. If hazards due to accidental contact withmoving machinery or unintentional flow of liquid, gas or solidsexist, an additional hardwired stop circuit may be required toremove the AC line to the drive. When the AC line is removed,there will be a loss of any inherent regenerative braking effect thatmight be present - the motor will coast to a stop. An auxiliarybraking method may be required.!ATTENTION: To guard against drive damage when usingoutput contactors, the following information must be read andunderstood. One or more output contactors may be installedbetween the drive and motor(s) for the purpose of disconnectingor isolating certain motors/loads. If a contactor is opened whilethe drive is operating, power will be removed from the respectivemotor, but the drive will continue to produce voltage at the outputterminals. In addition, reconnecting a motor to an active drive (byclosing the contactor) could produce excessive current that maycause the drive to fault. If any of these conditions are determinedto be undesirable or unsafe, an auxiliary contact on the outputcontactor should be wired to a drive digital input that isprogrammed as “Enable.” This will cause the drive to execute acoast-to-stop (cease output) whenever an output contactor isopened.Using PowerFlex® 700SDrives with RegenerativePower UnitsIf a Regenerative unit (i.e., 1336 REGEN) is used as a bus supply or a brake,the common mode capacitors should be disconnected (see Table 1.F onpage 1-18).