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12 Rockwell Automation Publication 750-PC108A-EN-P - April 2021

PowerFlex 755T Drives Configured to Order Program Product Information

Leakage Current

PowerFlex 750-Series products produce leakage current in the protective earthing conductor that exceeds 3.5 mA AC and/or 10 mA DC. The minimum size of the protective earthing (grounding) conductor that is used in the

application must comply with local safety regulations for high-protective earthing conductor current equipment.

Duty Rating

Each PowerFlex 755T Drives Configured to Order Program product is designed and sized based on a duty rating that is selected by the customer, based on the application. The duty rating of the drive must be set as

specified on the schematics and data nameplate.

Motor Overload Protection

PowerFlex 755T Drives Configured to Order Program products have the following motor overload protection.

Short-circuit Current Rating

This section covers short-circuit current rating for the PowerFlex 755T Drives Configured to Order Program product, based on input protection devices in a configured input bay. If there is no configured input bay or there

is a control-only configured input bay (has no input protection devices), then the short-circuit current rating information for the product is the same as the short-circuit current rating information for the standard drive.

Short-circuit current rating information for the standard drive is provided in the PowerFlex 750-Series Products with TotalFORCE Control Installation Instructions, publication 750-IN100

Branch Circuit Short-circuit Protection

This section covers branch circuit short-circuit protection that is provided by configured input bays with input protection devices. If there is no configured input bay or there is a control-only configured input bay (has no

input protection devices), then see the fuses and circuit breaker recommendations for the standard drive. Those recommendations are provided in the PowerFlex 750-Series Products with TotalFORCE Control Installation

Instructions, publication 750-IN100

Branch circuit short-circuit protection must meet the following requirements:

• Branch circuit protection must be provided in accordance with the National Electric Code (NEC) and any additional local codes, or the equivalent.

• Branch circuit protection for customer supplied 240/120V AC must have an AIC rating that is equal to or greater than the product short-circuit current rating.

The following methods of input protection are used in the configured input bays:

• Input Power Fuses

on page 13

• Input Power Circuit Breakers on page 15

Fuses

Two categories of fuses are used in the configured input bays:

• Configured input bays with fuse input protection use Input Power Fuses

on page 13.

• All configured input bays use Control Fuses

Control Fuses

ATTENTION: PowerFlex 750-Series drives with TotalFORCE control produce DC current in the protective earthing conductor

which can reduce the ability of residual current-operated protective devices (RCDs) or residual current-operated monitoring

devices (RCMs) of type A or AC to provide protection for other equipment in the installation. Where an RCD or RCM is used for

protection if there is direct or indirect contact, only an RCD or RCM of Type B is allowed on the supply side of this product.

Electronic motor overload protection Class 10 motor overload protection according to NEC article 430 and motor over-temperature protection according to NEC article 430.126 (A)(2). UL61800-5-1 File E59272.

Maximum short-circuit current rating

Suitable for use on a circuit capable of delivering not more than 100 kA rms symmetrical amperes, up to 600V maximum and 65 kA rms symmetrical amperes at 690V

maximum.

Actual short-circuit current rating

May be further limited by AIC rating of customer supplied branch circuit short-circuit protection device (fuse or circuit breaker). The lowest rated device in the circuit

determines the branch short circuit rating. If the protection device providing power to the drive is rated lower than 100 kA rms, the branch short circuit protection is the short

circuit rating of the protection device. If the protection device has a rating higher than 100 kA rms, the branch circuit protection is 100 kA rms. For branch circuit short-circuit

protection fuse and circuit breaker ratings, see Input Power Fuses

on page 13 and Input Power Circuit Breakers on page 15.

Table 1 - Control Fuses Inside the Configured Input Bays

Frame Fuse Input Voltage (V) Specification

Quantity

Included in

Configured

Input Bay

Manufacturer

Part Number

8, 9

Control Transformer