Yaskawa AC Drive-P1000 Industrial Fan - Manual (Page 384)

8.5 Installing Peripheral Devices
This section describes the proper steps and precautions to take when installing or connecting various peripheral devices to the
drive.
NOTICE: Use a class 2 power supply when connecting to the control terminals. Improper application of peripheral devices could result in
drive performance degradation due to improper power supply. Refer to NEC Article 725 Class 1, Class 2, and Class 3 Remote-Control,
Signaling, and Power Limited Circuits for requirements concerning class 2 power supplies.
u Dynamic Braking Options
Dynamic braking (DB) helps bring the motor to a smooth and rapid stop when working with high inertia loads. As the drive
lowers the frequency of a motor moving a high inertia load, regeneration occurs. This can cause an overvoltage situation when
the regenerative energy flows back into the DC bus capacitors. A braking resistor prevents these overvoltage faults.
NOTICE: Do not allow unqualified personnel to use the product. Failure to comply could result in damage to the drive or braking circuit.
Carefully review the braking resistor instruction manual when connecting a braking resistor option to the drive.
Note: 1. Properly size the braking circuit to dissipate the power required to decelerate the load in the desired time. Ensure that the braking circuit
can dissipate the energy for the set deceleration time prior to running the drive.
2. Set L8-55 to 0 to disable the internal braking transistor of the drive protection when using braking resistor options.
3. Set L3-04 to 0 to disable Stall Prevention during deceleration when using a regenerative converter, a regenerative unit, a braking resistor,
or the Braking Resistor Unit. The default setting for the Stall Prevention function (enabled) will interfere with the braking resistor.
WARNING! Fire Hazard. The braking resistor connection terminals are B1 and B2. Do not connect a braking resistor directly to any other
terminals. Improper wiring connections could result in death or serious injury by fire. Failure to comply may result in damage to the 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 in damage
to the drive or equipment.
n Installing a Braking Resistor: ERF type
ERF type braking resistors provide dynamic braking capability with up to 3% ED. They can be directly connected to the B1
and B2 terminals of the drive as shown in Figure 8.13 .
Enable the drive braking resistor overload protection by setting L8-01 to 1 when using ERF type resistors.
Drive
Braking Resistor
B1
B2
Figure 8.13 Connecting a Braking Resistor: ERF Type
n Installing a Braking Resistor Unit: LKEB type
LKEB type braking resistors provide dynamic braking capability with up to 10% ED. They can be directly connected to the
drives B1 and B2 terminals as shown in Figure 8.14 . The LKEB unit has a thermal overload contact that should be utilized
in order to switch off the drive in case braking resistor overheat occurs.
The internal braking resistor overload protection of the drive cannot protect LKEB resistors. Set L8-01 to 0 to disable this
function.
8.5 Installing Peripheral Devices
384 YASKAWA SIEP YAIP1U 01B AC Drive - P1000 Technical Manual