Siemens SAMMS-MV user manual Error Condition

Page 43

4 Troubleshooting

Error Condition

Incomplete

Sequence

External Trip

Troubleshooting

Guide

 

 

 

 

Main Cause

 

Remedy

Indicates the SAMMS-MV unit does not

1 .

If the unit trips one second after start, verify that

detect current one second after a start

 

current transformer secondary input is present in the

command, or it detects current one

 

range of 100 mVAC to 3.54 VAC at terminals 1, 2,

second after a stop command.

 

and 3 with reference to 4. Verify that the coil voltage

 

 

is 115 VAC at terminals 14, 15, or 16 with reference

 

 

to 13

when the motor is started. Verify 115 VAC at

 

 

terminal 7 with reference to 13. Correct conditions if

 

 

necessary. Call Siemens if unit continues to trip.

 

2 . If the unit trips one second after a stop command,

 

 

verify the contactor is open. Repair or replace the

 

 

contactor if it is not functioning properly.

 

3 . Verify

operation of mechanical interlock, and replace

 

 

or adjust.

 

4 . Verify absence of voltage at terminals 1, 2, and 3 with

 

 

reference to 4, and at terminals 14, 15, or 16 with

 

 

reference to 13. If voltage is present, define the

 

 

source and reconnect so that the motor current only

 

 

passes through the current transformer.

 

5 . To disable incomplete sequence, select F1 on the

 

 

HHC, press the ENTER key for one or more seconds

 

 

and start the motor. The incomplete sequence will

 

 

remain disabled until the above procedure is

 

 

repeated.

If the external trip LED is solidly

1 .

Jam conditions such as a blocked conveyor belt or

illuminated and the motor is stopped, it

 

gear train cause a sudden increase in motor current,

indicates a jam or loss of load

 

which can damage the motor’s insulation in a short

condition, or a trip caused by an

 

period of time.

overtemperature indication from an

 

 

 

RTD.

2 .

Loss of load conditions, such as a broken blade of an

 

 

impeller or loss of back pressure of a pump, result in

 

 

a sudden decrease in motor current.

 

3 . RTD

trip indicates that the stator temperature or the

 

 

temperature of one of the bearings has exceeded its

 

 

threshold.

 

 

RTD stator trip indicates either that the motor cooling

 

 

system is blocked, or that the fan is broken.

 

 

RTD bearing trip indicates overheating of the motor or

 

 

load

bearings.

In any case, the motor should not be restarted until the cause of the overheating has been corrected.

4 . F16 on the HHC displays the external trip current at the time of the trip, or the RTD number which caused the trip.

In any case, determine the reason for the external trip and correct the problem before restarting the motor. If the external trip LED flashes and the motor continues to run, it indicates loss of load warning or process current warning.

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Contents SAMMS-MV Qualified Person Contents Field Service Operation Signal WordsQualified Person About this Manual Advanced Protection for Medium-Voltage Motors SAMMS-MV Device ModelsOverload Protection Using the Standardized Control PanelProgramming Control Circuits Light bars Change settings requires password Yes Remote inputs OneSAMMS-MV Model Outputs OneInstalling the SAMMS-MV Device Full voltage non-reversing connection diagram Grounding the Device SAMMS-MV device communications connections Performing an Overload Relay Test Password ProtectionUsing the Reset/Test Push Button Performing a Lamp TestInput Devices Output DevicesCustom Ladder Diagrams Ladder Diagrams Library of Standard Ladder DiagramsSAMMS-MVX Standard control circuits PB1 PB2 PB3 PB4 PB5 PB6 Intelligent Reduced-Voltage Starting SAMMS-MVX Only Ridethrough Upon Loss of Power SAMMS-MVX OnlyMotor Ambient Temperature Incomplete SequenceODP motor thermal signature Protection Curves and Overload Classes Seconds Operating the SAMMS-MV 11 Motor protection graph Jam Protection SAMMS-MVX Only Ultimate Trip Level and Service FactorPhase Unbalance Dual Overload Protection SAMMS-MVX OnlyCooling Time Constants Ground Fault DetectionRepetitive Starts Start Inhibit12 Multi-start scenario for an ODP motor Function Key Autoreset After a Trip SAMMS-MVX OnlyUsing the Hand Held Communicator HHC Emergency RestartingMotor type Overload trip class class 2 through 5A CT primary current low speed if used Service factorFunction Number 5A CT primary current if used Full load current for OLR NoUsing the SAMMS-MV Device Func- tions Using the Enter KeyUP and Down Keys ON/OFF Select jam pickup current 120-400% Iflc F24 Loss of Load Select ground fault pick-up currentDefault Value Means warning13 Entering and changing passwords F1 Control Circuit Number and Incomplete Se- quence Status Program Mode/PasswordsF0 Ambient Temperature SAMMS-MV Functions18 to 72A Overload Setting Step Default Relay Size RangeF3 Size for Overload Relay #2 SAMMS-MVX Only F4 Full-Load Current for Overload Relay #1F7A Cold Stall Time F6 Service FactorF6A Motor Type F7 Overload Trip ClassF11 Emergency Restarting F8 Autoreset SAMMS-MVX OnlyF9 Phase Unbalance Protection F10 Display Time to RestartF13 Set Programmable Timer #1 F12 Ground Fault Protection or WarningF12A Ground Fault Pickup Current Size Pickup Current Default H3A-H3C 7A-I FLC 10A 20AF18 Display Total Elapsed Run Time of the Motor F21 Reset Motor DataF16 Trip Current F17 Current UnbalanceF23A Jam Pickup Current SAMMS-MVX Only F25 Percentage of Motor Winding TemperatureF22 Process Current Warning Level SAMMS-MVX Only F23 Jam Protection SAMMS-MVX OnlyF27 Address F26 Baud RateTroubleshooting 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
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