Functions; Switching The 3Rm1 Motor Starter Under Normal Operating Conditions; Direct-On-Line Starter - Siemens 340 Manual

3.5

Functions

3.5.1

Switching the 3RM1 motor starter under normal operating conditions

A typical application area of the 3RM1 motor starter is the switching and protection of
motors. You can also operate the 3RM1 motor starter on resistive loads such as heaters.
Note
Minimum loads must be observed for the 3RM1 motor starters.
You will find additional information in the chapter "Minimum load current (Page 57)".
NOTICE
Damage from operating capacitive loads
When using capacitive loads, the switching components in the 3RM1 motor starter can be
damaged by excessively high making currents.
Do not operate capacitive loads such as frequency converters on the 3RM1 motor starter.
Operation of single-phase capacitor motors is admissible.
NOTICE
Damage during operation on non-sinusoidal voltages
When operating frequency converters, the switching components in the 3RM1 motor starter
can be damaged by non-sinusoidal voltages.
Do not operate the 3RM1 motor starter on outputs of frequency converters.
3.5.1.1

Direct-on-line starter

Using the 3RM1 motor starter as a direct-on-line starter
All 3RM1 motor starters can be used as direct-on-line starters.
To switch the 3RM1 motor starter on, apply the control voltage at input IN1.
After the motor is switched off, the motor starter accepts a new start after 500 ms.
You can also use the versions of the 3RM1 motor starter with a rated operational current up
to 7 A for switching resistive loads up to I
SIRIUS 3RM1 motor starter
Manual, 11/2013, A5E0345285095020A/RS-AB/002
= 10 A under normal operating conditions.
AC51
Description
3.5 Functions
27