8.5 Installing Peripheral DevicesYASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 427Peripheral Devices &Options88.5 Installing Peripheral DevicesThis section describes the proper steps and precautions to take when installing or connecting various peripheral devicesto the drive.NOTICE: Use a class 2 power supply (UL standard) when connecting to the control terminals. Improper application of peripheraldevices could result in drive performance degradation due to improper power supply. Dynamic Braking OptionsDynamic braking (DB) helps bring the motor to a smooth and rapid stop when working with high inertia loads. As thedrive lowers the frequency of a motor moving a high inertia load, regeneration occurs. This can cause an overvoltagesituation when the regenerative energy flows back into the DC bus capacitors. A braking resistor prevents theseovervoltage faults.NOTICE: Do not allow unqualified personnel to use the product. Failure to comply could result in damage to the drive or brakingcircuit. Carefully review the braking resistor instruction manual when connecting a braking resistor option to the drive.Note: 1. The braking circuit must be sized properly in order to dissipate the power required to decelerate the load in the desired time. Ensurethat the braking circuit can dissipate the energy for the set deceleration time prior to running the drive.2. Disable the drive's internal braking transistor protection by setting L8-01 = 0 when using braking resistor options.3. Ensure that Stall Prevention is disabled during deceleration (L3-04 = 0), when using a regenerative converter, a regenerative unit, abraking resistor or the Braking Resistor Unit. The default setting for the Stall Prevention function will interfere with the brakingresistor.WARNING! Fire Hazard. The braking resistor connection terminals are B1 and B2. Do not connect a braking resistor directly to anyother terminals. Improper wiring connections could result in death or serious injury by fire. Failure to comply may result in damage tothe braking circuit or drive.NOTICE: Connect braking resistors to the drive as shown in the I/O wiring examples. Improperly wiring braking circuits could result indamage to the drive or equipment. Installing a Braking Resistor: ERF typeAn ERF type braking resistors provides dynamic braking capability with up to 3% ED. It can be directly connected to thedrives B1 and B2 terminals like shown in Figure 8.18.Enable the drive’s braking resistor overload protection by setting L8-01 = 1 when using ERF type resistors.Figure 8.16Figure 8.18 Connecting a Braking Resistor: ERF TypeDrive Braking ResistorB1B2
