VS-626M5

What type of industrial applications is this inverter drive suited to?

This unit is suited to industrial motor control applications that require vector-controlled operation, such as spindle drives, machine tool axes and systems where stable speed and torque control are important. The VS-626M5 is commonly associated with Yaskawa VS Series inverter drive systems.

What should be checked before powering the unit for the first time?

Before energising the drive, check that the inverter, converter and motor ratings are compatible, that all wiring follows the correct connection arrangement, that terminal screws and connectors are secure, and that the unit is correctly grounded. The surrounding machine area should also be checked for free movement and correct operation of emergency stop functions.

What installation environment is recommended?

The drive should be installed indoors in a dry, well-ventilated control panel, away from corrosive gases, excessive dust, oil mist, water droplets and direct sunlight. It should be mounted on non-flammable material, typically a metal panel, with adequate space for airflow.

What ambient temperature range should be considered during operation?

For the inverter and converter, the operating ambient temperature range is typically 0°C to 55°C, with the heatsink intake air kept at or below 45°C. If the unit is mounted in an enclosed panel, ventilation or panel cooling should be considered to prevent excessive heat build-up.

How should power and signal cables be routed?

Power cables and signal cables should be kept separate and made as short as practical. Encoder and signal wiring should not be bundled with inverter output wiring or other power cables, as electrical noise can cause vibration, unstable operation or incorrect feedback signals.

What grounding requirements apply to this type of drive?

The drive, converter and motor should each be grounded correctly using suitably sized conductors. For 200 V class systems, grounding resistance should be 100 ohms or less; for 400 V class systems, it should be 10 ohms or less. Ground wiring should be kept separate from large-current equipment such as welding machines.

Can the motor be connected directly to a mains power supply?

No. The matching motor should not be connected directly to a commercial mains supply. It is designed to operate as part of the inverter drive system, and direct mains connection could damage the motor or create uncontrolled operation.

What cable type is recommended for encoder signals?

Encoder signal wiring should use shielded twisted-pair cable. The shield should be terminated as specified for the system, and the cable should be routed away from main circuit and output power wiring to minimise interference.

What routine inspection points are relevant for this drive?

Routine checks should include looking for abnormal motor noise or vibration, unusual heat, excessive ambient temperature and abnormal output voltage readings. Periodic checks should also include terminal tightness, connector condition, fan operation and signs of dust or oil accumulation inside the panel.

What components typically require periodic replacement?

Service intervals depend on operating conditions, but the manual gives indicative replacement periods for items such as cooling fans, smoothing capacitors, fuses, PCB electrolytic capacitors, motor bearings and motor cooling fans. For example, inverter and converter cooling fans are commonly listed at around 2 to 3 years under typical operating assumptions.

What precautions apply before inspection or component replacement?

Only qualified personnel should inspect or replace components. Main circuit and control power must be turned off, and work should begin only after the CHARGE indicator and display have gone out. Internal capacitors can remain charged for a period after power is removed.

What happens when a fault is detected?

When a fault is detected, the protective function activates, an error is displayed on the 7-segment display or digital operator, and the motor coasts to a stop. The cause should be identified and corrected before a reset is attempted.

How is a fault reset carried out?

After the cause of the fault has been removed, the fault can be reset using the reset input, the RESET key in fault display mode, or by turning off the main circuit power. External run commands such as FWD, REV or ORT should be turned off before resetting.

What may cause the motor to rotate slowly or vibrate without normal rotation?

Possible causes include incorrect inverter-to-motor wiring, disconnected or loose encoder signal wiring, a faulty encoder, torque limiting signals being active or a control PCB fault. The encoder wiring, motor connections and operating status displays should be checked first.

What should be considered when mounting the associated motor?

The motor should be mounted securely on a robust base, with correct alignment to the driven machine. Coupling alignment, belt tension and pulley parallelism should be checked carefully, and excessive shock or axial load on the motor shaft should be avoided.