AutomationDirect SureServo2 Manual - Page 12

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Chapter 2: Installation

Servo Drive

(W)

400W

750W

1500W

2000W

3000W

5500W**

7500W**

15000W**

* Using a resistance value lower than the minimum specified can cause too high of a current

draw for the drive to handle. Note that there is no maximum resistance limit.

** 5.5 kW, 7.5 kW, and 15kW drives do not have an internal resistor. Enter your external

resistance and wattage values here.

When the regenerative energy exceeds the capacity of built-in regenerative resistor, you should

use an external regenerative resistor. Please pay special attention to the following when using

an external regenerative resistor.

• Please choose the correct resistance (P1�052) and wattage (P1�053) for the regenerative

resistor; otherwise it might influence the performance� For drives up to and including 3kW,

the drives include a built-in resistor� For heat dissipation reasons the Wattage of the actual

resistor is decreased in P1�053 vs� what is actually printed on the resistor� If the resistor was

externally mounted with good airflow then the full Watt value of the resistor can be entered

in P1�053� For further drive and resistor protection the drive's firmware uses half that value

(P1�053/2) for energy regeneration calculations�

• When using an external regenerative resistor, please note that its resistance must be greater

than the resistance of the built-in regenerative resistor� For general application, you can

connect more than one resistor in series� If the value (from resistors connected in series)

exceeds the rated range, you can reduce the value by connecting the resistor in parallel� If you

want to connect the resistors in parallel to increase the power of the regenerative resistor,

please make sure the wattage and resistance capacity meet the requirements�

See the following diagram and settings for connecting the regenerative resistors in serial and

parallel�

This simplified diagram of the braking resistor circuitry shows the connections and usage

of the internal regen resistor and factory-installed P3-D jumper (pre-installed on ≤ 3kW

drives), and how the optional external resistor is used� External resistors are recommended

(disconnect the P3-D jumper) in regen applications to remove heat from the drive that would

be generated by using the internal regen resistor�

Note: If the internal AND an external resistor are both used (the P3-D jumper is NOT

removed), make sure that the parallel resistance is still within the specified range for the

drive in the table above).

Page 2–12

Built-in Regenerative Resistor

Specifications

Resistance

Watts

(P1.052) (Ohm)

(P1.053)

100

Regenerative

Resistor Wattage for

Resistance* (Connected to

Internal Calculations

external resistor) (Ohm)

(P1.053/2)(Watt)

See calculations below

for recommended value

SureServo2 User Manual – 1st Edition – 05/20/2021

Minimum Allowable