Siemens MICROMASTER 420 - 2 Engineering Information

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MICROMASTER 420 Reference Manual

Issue A1

2 Engineering Information

This chapter contains Information to assist the user in using the

MICROMASTER 420 in the most efficient way.

Topics include connection details, derating factors and methods of protecting the

motor and inverter.

Examples are given to illustrate the use of the parameter list.

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2.1 Current Limit and Overload Operation ......................................................................8

2.1.1 Current Monitoring Accuracy.....................................................................................9

2.2 Fast Current Limit......................................................................................................9

2.3 Positive Temperature Coefficient Resistor Use.......................................................10

2.4 I

t Performance........................................................................................................10

2.5 Internal Overtemperature ........................................................................................10

2.6 Overvoltage and Trip Levels....................................................................................11

2.7 Boost........................................................................................................................11

2.8 Proportional and Integral Control (PI)......................................................................12

2.8.1 What is Closed Loop control?..................................................................................12

2.8.2 Implementation on MICROMASTER 420................................................................12

2.8.3 Setting up the PI controller ......................................................................................12

2.8.4 PI Setpoint ramp times ............................................................................................14

2.8.5 PI Controller Proportional and Integral terms..........................................................14

2.8.6 Ziegler-Nichols method of Optimisation ..................................................................16

2.8.7 PI output limits .........................................................................................................18

2.8.8 Further features .......................................................................................................18

2.9 Braking.....................................................................................................................20

2.9.1 Normal Braking........................................................................................................20

2.9.2 DC Braking ..............................................................................................................20

2.9.3 Vdc Max Controller..................................................................................................21

2.9.4 Compound Braking..................................................................................................21

2.10 Derating Factors......................................................................................................22

2.10.1 Derating with Temperature......................................................................................22

2.10.2 Operation with Long Cables ....................................................................................22

2.10.3 Derating with Altitude...............................................................................................24

2.10.4 Derating with Switching Frequency.........................................................................24

2.10.5 Derating for Sideways Installation...........................................................................25

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