Overload; Additional Information For Ul Compliance; Derating Information - ABB ACS255 User Manual

12.3. Overload

The ACS255 can deliver 150% of the drive nominal output current for 60 seconds and 175% for 2 seconds.

12.4. Additional Information for UL Compliance

ACS255 is designed to meet the UL requirements. In order to ensure full compliance, the following must be fully observed.

For an up to date list of UL compliant products, please refer to UL listing NMMS.E211945

The drive can be operated within an ambient temperature range as stated in section 12.1

For IP20 units, the drive must be installed in a cabinet to fulfil the requirements for shielding from contact and environment
contamination.

For IP66 units, indoor installation in an environment free from icing and condensation.

UL Listed ring terminals / lugs must be used for all bus bar and grounding connections.
Input Power Supply Requirements
Supply Voltage 110-115 Volts RMS for 110 Volt rated drives, + /- 10% variation allowed.
200 – 240 Volts RMS for 230 Volt rated drives, + /- 10% variation allowed.
380 – 480 Volts RMS for 400 Volt rated drives, + / - 10% variation allowed.
Imbalance Maximum 3% voltage variation between phase – phase voltages allowed
All ACS255 units have phase imbalance monitoring. A phase imbalance of > 3% will result in the drive tripping. For
input supplies which have supply imbalance greater than 3% (typically the Indian sub- continent & parts of Asia Pacific
including China) ABB recommends the installation of input line reactors.
Frequency 50 – 60Hz + / - 5% Variation
Short Circuit Capacity Voltage Rating
115V
230V
400 / 460V
All the drives in the above table are suitable for use on a circuit capable of delivering not more than the above
specified maximum short-circuit Amperes symmetrical with the specified maximum supply voltage.
Incoming power supply connection must be according to section 5.3
All ACS255 units are intended for indoor installation only and within controlled environments which meet the condition limits shown in section
12.1
Branch circuit protection must be installed according to the relevant national codes. Fuse ratings and types are shown in section 12.2
Suitable Power and motor cables should be selected according to the data shown in section 12.2
Power cable connections and tightening torques are shown in section 4.
ACS255 provides motor overload protection in accordance with the National Electrical Code (US).

Where a motor thermistor is not fitted, or not utilized, It is recommended that the Thermal Overload Memory Retention is enabled
by setting 3005 THERMAL OVERLOAD VALUE RETENTION = 1

Where a motor thermistor is fitted and connected to the drive, connection must be carried out according to the information shown
in section 10.6.

12.5. Derating Information

Derating of the drive maximum continuous output current capacity is required when

Operating at ambient temperature in excess of 40°C / 104°F.

Operating at Altitude in excess of 1000m/ 3281 ft.

Operation with Effective Switching Frequency higher than the minimum setting.
The following derating factors should be applied when operating drives outside of these conditions.
12.5.1. Derating for Ambient Temperature
Enclosure Type
IP20
IP66
12.5.2. Derating for Altitude
Enclosure Type
IP20
IP66
12.5.3. Derating for Switching Frequency
Enclosure Type 4kHz
IP20 N/A
IP66 N/A
Min HP
0.5
0.5
0.5
Maximum Temperature
Without Derating.
(UL Approved)
50°C / 122°F
40°C / 104°F
Maximum Altitude
Without Derating
1000m / 3281ft 1% per 100m / 328 ft
1000m / 3281ft 1% per 100m / 328 ft
8kHz
N/A
10%
Max HP
1.5
5
10
Derate by
N/A
2.5% per °C (1.8°F)
Derate by Maximum Permissible
Switching Frequency (Where available)
12kHz 16kHz
20% 30%
25% 35%
Maximum supply short-circuit current
100kA rms (AC)
100kA rms (AC)
100kA rms (AC)
Maximum Permissible Operating
Ambient Temperature with
Derating (Non UL Approved)
Maximum Permissible
(UL Approved) (Non-UL Approved)
2000m / 6562 ft 4000m / 13123 ft
2000m / 6562 ft 4000m / 13123 ft
24kHz
40%
50%
47
50°C
50°C
32kHz
50%
50%