Schneider Altivar Machine ATV320 frequency converter

Schneider Electric Altivar Machine ATV320 Inverter Installation Manual (NVE41289.07, June 2023), designed for asynchronous/synchronous motors, covers the power range of 0.18-15kW, and offers four structures: Book/C Compact/IP65/IP66. It specifies safety specifications, mechanical installation, electrical wiring, EMC filtering, control terminals, and maintenance processes, emphasizing 15 minute power outage discharge, STO safe torque shutdown, SCPD short circuit protection, derating curve, cable length limitation, and is compatible with voltage levels of 200-600V. It supports Modbus/CANopen communication and is a compliant operating basis for industrial site installation and commissioning.

Safety regulations (mandatory requirement)

Power outage safety

After power failure, wait for 15 minutes until the DC bus discharges to * *<42Vdc * * before operation.

Grounding requirements

Grounding resistance * * ≤ 1 Ω * *, minimum cross-sectional area of PE wire 10mm ² (copper wire).

safety function

STO (Safe Torque Off): Safe torque off, in compliance with mechanical safety standards.

Leakage current warning

The equipment leakage current * *>3.5mA * * must be reliably grounded.

Personnel Requirements

Only for professional electrical personnel to install, debug, and maintain.

Product Structure and Appearance

ATV320 is divided into four structures:

Structure code, shape type, protection level

B Book Type IP20

C Compact IP20

W waterproof type IP66

WS waterproof with switch type IP65

Installation requirements

environmental conditions

Working temperature: -10 ℃~+60 ℃ (rated below 50 ℃)

Altitude: ≤ 1000m without downgrading, with a 1% downgrading for every 100m increase between 1000-3000m

Pollution level: Level 2 (conventional)/Level 3 (waterproof)

Installation spacing

B/C type: Up, down, left, right * * ≥ 50mm**

W/WS type: Up and down * * ≥ 100mm**

Installation direction

Vertical installation, tilted * * ≤± 10 °**

Electrical wiring (core)

1. Power and motor terminals

Terminal function

L1/L2/L3, N three-phase/single-phase power input

U/V/W motor output

PA/+, PC/- DC bus

PB braking resistor

PE protective grounding

2. Control terminals

Digital input: DI1-DI6 (24Vdc, source/drain switchable)

Analog input: AI1/AI2/AI3 (0-10V/0-20mA)

Relay output: R1/R2 (250Vac/30VDC, 5A)

Communication: RJ45 (Modbus/CANopen)

3. Cable requirements

The maximum length of the motor wire is 50m (shielded), and if it exceeds this, an output filter needs to be added

Separate the wiring of power lines and signal lines, with a spacing of ≥ 20cm

Protection and EMC

Short Circuit Protection (SCPD)

IEC circuit breakers/fuses must be configured, with a maximum SCCR of 100kA

EMC filter

Standard built-in filter, IT system needs to disconnect the filter jumper

EMC measures

Shielded cable double ended grounding

Multiple grounding points for cabinets, door panels, and installation plates

Separate wiring for strong and weak electricity

Debugging and Inspection

Before powering on, 6 checks must be performed:

Mechanical installation is firm and the spacing is compliant

The wiring is correct and the terminal torque meets the standard

PE grounding is reliable

Matching of motor and frequency converter parameters

No debris, complete cover plate

STO wiring is correct

Maintenance and scrapping

Regular maintenance (at least once a year)

Clean dust and check for corrosion

Tighten all terminal screws

Check the operation of the fan

Long term storage

Stored for over 12 months, activated capacitor after 1 hour of power on

scrap disposal

Classify and recycle materials, following RoHS/REACH

Key issues

Question 1: Why do I have to wait for 15 minutes to operate the ATV320 frequency converter after it is powered off? How to verify the absence of electricity?

answer:

The DC bus capacitor inside the frequency converter stores high-voltage electrical energy, which will not disappear immediately after power failure; Waiting for 15 minutes can ensure that the capacitor discharges to a safe voltage of * *<42Vdc * *, avoiding the risk of electric shock/arc.

Non electric verification method: Use a multimeter to measure the voltage between * * PA/+and PC/- * *, and confirm that it is less than 42Vdc.

Question 2: What key operations must be performed when using ATV320 in IT power distribution systems? Why?

answer:

The Y capacitor jumper/screw with built-in EMC filter must be disconnected.

Reason: The IT system is a neutral ungrounded system, and the Y capacitor of the filter can cause abnormal ground leakage current, insulation monitoring false alarms, and equipment overvoltage damage. It can only operate safely after disconnection.

Question 3: What are the risks associated with ATV320 motor cables exceeding 50m? How to solve it?

answer:

Risk: If the motor wire is too long, it can cause reflection overvoltage, with a peak value of up to twice the bus voltage, which can break through the motor insulation.

Solution:

Install output reactor/filter

Enable the frequency converter * * motor surge limit (SUL) * * function

Reduce the switching frequency to below 4kHz

Use frequency conversion dedicated motor (IEC 60034-25)