Motor protection graph | Siemens SAMMS-MV guide

3 Operating the SAMMS-MV Device

100000

10000

1000

Seconds

100

10

1

.1

.1

Motor running current at full load current


Loss of load
Loss of load
adjustable from
		Jam protection

20 to 90% of
		adjustable from

rated FLC
rated FLC		120 to 400% of FLC
		120 to 400% of FLC


						Cold stall time
	Class 5 curve					Cold stall time
	Class 5 curve					adjustable from
						5 to 100 seconds

Jam and loss of load protection persistence delay (5 times overload class)

Motor starting current

600% rated full load current

1

6

10

Iratio

IFLC

Figure 3.11 Motor protection graph

22

Image 24

Siemens SAMMS-MV user manual Motor protection graph

Contents

SAMMS-MV Qualified Person Contents Signal Words Field Service OperationQualified Person About this Manual SAMMS-MV Device Models Advanced Protection for Medium-Voltage Motors Using the Standardized Control Panel Overload ProtectionProgramming Control Circuits Change settings requires password Yes Remote inputs One SAMMS-MV ModelOutputs One Light bars Installing the SAMMS-MV Device Full voltage non-reversing connection diagram Grounding the Device SAMMS-MV device communications connections Password Protection Using the Reset/Test Push ButtonPerforming a Lamp Test Performing an Overload Relay Test Output Devices Input Devices Ladder Diagrams Library of Standard Ladder Diagrams Custom Ladder Diagrams SAMMS-MVX Standard control circuits PB1 PB2 PB3 PB4 PB5 PB6 Ridethrough Upon Loss of Power SAMMS-MVX Only Motor Ambient TemperatureIncomplete Sequence Intelligent Reduced-Voltage Starting SAMMS-MVX Only ODP motor thermal signature Protection Curves and Overload Classes Seconds Operating the SAMMS-MV 11 Motor protection graph Ultimate Trip Level and Service Factor Phase UnbalanceDual Overload Protection SAMMS-MVX Only Jam Protection SAMMS-MVX Only Ground Fault Detection Repetitive StartsStart Inhibit Cooling Time Constants 12 Multi-start scenario for an ODP motor Autoreset After a Trip SAMMS-MVX Only Using the Hand Held Communicator HHCEmergency Restarting Function Key 5A CT primary current low speed if used Service factor Function Number5A CT primary current if used Full load current for OLR No Motor type Overload trip class class 2 through Using the Enter Key Using the SAMMS-MV Device Func- tionsUP and Down Keys ON/OFF Select ground fault pick-up current Default ValueMeans warning Select jam pickup current 120-400% Iflc F24 Loss of Load 13 Entering and changing passwords Program Mode/Passwords F0 Ambient TemperatureSAMMS-MV Functions F1 Control Circuit Number and Incomplete Se- quence Status Overload Setting Step Default Relay Size Range F3 Size for Overload Relay #2 SAMMS-MVX OnlyF4 Full-Load Current for Overload Relay #1 18 to 72A F6 Service Factor F6A Motor TypeF7 Overload Trip Class F7A Cold Stall Time F8 Autoreset SAMMS-MVX Only F9 Phase Unbalance ProtectionF10 Display Time to Restart F11 Emergency Restarting F12 Ground Fault Protection or Warning F12A Ground Fault Pickup CurrentSize Pickup Current Default H3A-H3C 7A-I FLC 10A 20A F13 Set Programmable Timer #1 F21 Reset Motor Data F16 Trip CurrentF17 Current Unbalance F18 Display Total Elapsed Run Time of the Motor F25 Percentage of Motor Winding Temperature F22 Process Current Warning Level SAMMS-MVX OnlyF23 Jam Protection SAMMS-MVX Only F23A Jam Pickup Current SAMMS-MVX Only F26 Baud Rate F27 Address Troubleshooting Error Condition Troubleshooting Guide Error Condition Appendix a Technical Specifications Over load Spec ificat ions Stat ist ica l Data Dimensions Catalog Number SAM6 Switch # Function Position 375 Siemens Energy Automation, Inc