3 Startup Procedure and Test Run
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YASKAWA ELECTRIC
SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
The encoder used with pressure-resistant explosion-proof motors is intrinsically safe. When wiring between the
drive and encoder, always connect through a specialized pulse coupler.
Geared Motors
The continuous speed range differs depending on the lubricating method and the manufacturer. In particular, in the
case of oil lubrication, continuous operation in the low speed range may cause burnout. Consult with the
manufacturer for the applications that require frequencies in excess of the rated frequency.
Single-Phase Motors
Variable speed drives are not designed to operate with single phase motors. Using capacitors to start the motor
causes a high frequency current to flow to the capacitors and can damage the capacitors. A split-phase start or a
repulsion start can burn out the starter coils because the internal centrifugal switch is not activated. The drive is
for use with three-phase motors only.
Motor with Brake
When using a drive to operate a motor with brake, and the brake is connected to the output side of the drive, it
may not release at start due to low voltage levels. Use a motor with brake that has an independent source of power
for the brake. Connect the brake power supply to the power supply side of the drive. Note that motors with built-
in brakes tend to generate a fair amount of noise when running at low speeds.
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Notes on the Power Transmission Mechanism
For power transmission machinery that uses oil to lubricate gearboxes, transmissions, or reduction gears, make
sure that you use precaution if you operate the machinery continuously at low speed. Oil does not lubricate the
system as well at low speeds. If you operate at frequencies higher than the rated frequency, it can cause problems
with the power transmission mechanism. These problems include audible noise, decreased service life, and
decreased durability.
3
Startup Procedure and Test Run
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General Safety
DANGER
Electrical Shock Hazard. Do not examine, connect, or disconnect wiring on an energized drive. Before
servicing, disconnect all power to the equipment and wait for the time specified on the warning label at a minimum. The internal
capacitor stays charged after the drive is de-energized. The charge indicator LED extinguishes when the DC bus voltage
decreases below 50 Vdc. When all indicators are OFF, remove the covers before measuring for dangerous voltages to make
sure that the drive is safe. Failure to obey will cause death or serious injury.
WARNING
Electrical Shock Hazard. Do not operate equipment when covers are missing. Some figures in this section
include drives without covers or safety shields to more clearly show the inside of the drive. Replace covers and shields before
operation. Use drives only as specified by the instructions. Failure to obey can cause death or serious injury.Electrical Shock
Hazard. Do not remove covers or touch circuit boards while the drive is energized. Failure to obey can cause death or serious
injury.Crush Hazard. In hoist-type applications, install a holding brake and take applicable precautions that will not let the load
fall. Take applicable precautions that an external sequence activate the holding brake in case of emergency, when the drive is
de-energized or when the drive detects a fault. Failure to obey could cause death or serious injury.Crush Hazard. Install a fall
detector or overspeed detector to the external controller. Failure to obey can cause serious injury or damage to machinery.