Installation Instructions

Document No. DPD01375

August 24, 2018

Page 4 of 36

Siemens Industry, Inc.

NOTE:

The overloads are dialed in by the factory, based

on the NEC FLA rating tables, and assume a trip

(activation) level at 125%. If the 125% is

acceptable for your installation, dial in the overload

to match the connected motor's FLA rating. If a

different percentage is desired, a multiplier must be

used to determine the proper setting. This is a two-

step process:

First, determine the multiplier. This can be

calculated by dividing 125% by the desired

percentage.

Formula: Desired % ÷ 125% = Multiplier

Example: 115% ÷ 125% = 0.92

Second, the new multiplier is used with the motor's

FLA to determine the dial setting of the overload.

This can be calculated by multiplying the Motor

FLA by the multiplier to provide the desired setting.

Formula: Motor FLA × multiplier = Dial Setting

Example: 24 × 0.92 = 22.08

Therefore, a motor with an FLA of 24 Amps, and a

desired overload setting of 115% would require the

overload dial to be set to a value of 22.08 to have

the desired effect.

With some high-efficiency motors, the overload

supplied with the bypass option may not be able to

be dialed down low enough for the installation.

When this occurs, an alternate overload relay must

be installed into the bypass option.

When an overload is exchanged in the installation

to a smaller size, the UL certification will remain on

the unit. However, the installation will be subject to

approval by the customer and/or the local electrical

authority.