ABB ACS320 User Manual

198 Actual signals and parameters
 Group 25: Critical speeds
This group defines up to three critical speeds or ranges of speeds that are to be
avoided due, for example, to mechanical resonance problems at certain speeds.
Group 25: Critical speeds
Code Description Range Resolution Default S
2501
CRIT SPEED SEL
0, 1 1 0
Sets the critical speeds function on or
off. The critical speed function avoids
specific speed ranges.
0 = OFF – Disables the critical speeds
function.
1 = ON – Enables the critical speeds
function.
Example: To avoid speeds at which a
fan system vibrates badly:
• Determine problem speed ranges.
Assume they are found to be:
18…23 Hz and 46…52 Hz.
• Set 2501 CRIT SPEED SEL = 1.
•Set 2502 CRIT SPEED 1 LO = 18
Hz.
•Set 2503 CRIT SPEED 1 HI = 23 Hz.
•Set 2504 CRIT SPEED 2 LO = 46 Hz.
•Set 2505 CRIT SPEED 2 HI = 52 Hz.
2502
CRIT SPEED 1 LO
0.0 … 500.0 Hz 0.1 Hz 0.0 Hz
Sets the minimum limit for critical speed range 1.
• Value must be less than or equal to 2503 CRIT SPEED 1 HI.
• Units are rpm.
2503
CRIT SPEED 1 HI
0.0 … 500.0 Hz 0.1 Hz 0.0 Hz
Sets the maximum limit for critical speed range 1.
• Value must be greater than or equal to 2502 CRIT SPEED 1 LO.
• Units are rpm.
2504
CRIT SPEED 2 LO
0.0 … 500.0 Hz 0.1 Hz 0.0 Hz
Sets the minimum limit for critical speed range 2.
• See parameter 2502 CRIT SPEED 1 LO.
2505
CRIT SPEED 2 HI
0.0 … 500.0 Hz 0.1 Hz 0.0 Hz
Sets the maximum limit for critical speed range 2.
• See parameter 2503 CRIT SPEED 1 HI.
2506
CRIT SPEED 3 LO
0.0 … 500.0 Hz 0.1 Hz 0.0 Hz
Sets the minimum limit for critical speed range 3.
• See parameter 2502 CRIT SPEED 1 LO.
f
output
52
46
23
18
f
REF
(Hz)
f1L
18
f2L
46
f1H
23
f2H
52

ABB ACS320 Specifications

General

Overload Capacity	150% for 60 seconds
IP Rating	IP20
Frame Size	R1 to R3
Enclosure Rating	IP20
Frequency Range	0 to 500 Hz
Protection Features	Overvoltage, Undervoltage, Overcurrent, Overload, Short circuit, Ground fault, Overtemperature
Fieldbus Communication	Modbus RTU, PROFIBUS DP, CANopen
Communication Interfaces	RS485
Operating Temperature	-10 to +50 °C (14 to 122 °F)
Storage Temperature	-40°C to +70°C
Humidity	Less than 95% (non-condensing)
Supply Voltage	200 V to 240 V (±10%), 380 V to 480 V (±10%)
Input Voltage	200 V to 240 V (±10%), 380 V to 480 V (±10%)

Summary

Safety

Safety in installation and maintenance

General safety rules for drive, motor cable, and motor installation and maintenance.

Electrical safety

Critical electrical safety instructions for qualified electricians, including precautions against electric shock.

General safety

General safety guidelines for installation, start-up, and operation, including warnings about ignoring instructions.

Planning the electrical installation

Implementing the AC power line connection

Specifies requirements for connecting the drive to the AC power line, including leakage current considerations.

Selecting the supply disconnecting device (disconnecting means)

Details the types of disconnecting devices required for different regions and safety standards.

Selecting the power cables

Electrical installation

Checking the insulation of the assembly

Instructions for checking the insulation of the drive, input power cable, and motor/motor cable to ensure safety.

Connecting the power cables

Provides connection diagrams and procedures for safely connecting input power and motor cables, including grounding.

Connecting the control cables

Start-up

Start-up by using the Start-up assistant

Guides users through the step-by-step process of using the Start-up assistant for initial drive configuration.

Start-up by changing the parameters individually

Application macros

Selecting an application macro

HVAC default

Program features

Start-up assistant

Explains the function of the Start-up assistant in guiding users through initial drive configuration and data entry.

Actual signals and parameters

Group 99: Start-up data

Fieldbus control

System overview

Mechanical and electrical installation – EFB

Serial communication selection

Fault tracing

Alarm and fault indications

Explains how alarms and faults are indicated via LEDs and panel messages, and how to identify causes.

How to reset

Details the methods for resetting faults, including keypad, digital input, fieldbus, or power cycling.

Alarm messages generated by the drive

Lists common alarm messages, their causes, and recommended troubleshooting steps for quick resolution.

Fault messages generated by the drive

Provides a comprehensive list of drive faults, their potential causes, and corrective actions for effective troubleshooting.

Maintenance and hardware diagnostics

Maintenance intervals

Cooling fan

Technical data

Ratings

Provides detailed electrical and mechanical ratings for various ACS320 drive types, including input/output currents and frame sizes.

Sizing

Guides users on how to size the drive based on motor current and power, considering ambient temperature and altitude derating.

Fuses and alternate short-circuit protection

Specifies fuse requirements and alternative manual motor protectors for branch circuit protection, ensuring safe operation.