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It’s not often we can brag about a vendor’s website, but Lenze recently released a super handy diagnostics page for their SMV series of drives.

We wanted to give you a quick summary to make things a little easier but we’ll leave a link to Lenze’s Real Time Diagnostics page too! We’ll also leave a link for the SMV Series operating manual.
So let’s get to it! Here’s a quick diagnostics list based on different operating status. 

Drive Output Diagnostics

P510: Drive Output Power (kW)
Parameter P510 gives a real time readout of the drive kW output.
P509: Torque (% of motor rated torque)
Parameter P509 displays the amount of torque applied in terms of % of the total rated torque of the motor. This parameter is only available when the drive is in Vector speed or Vector Torque mode (P300 set to a 4 or 5)
P507: Load (% of drive rated output)
Selecting the drive program parameter P507 will show the drive output load on the drive display. The value displayed is expressed in % of the drive full load output rating.
P506: AC Output Voltage
When the drive program parameter P506 is selected, the drive display will change to show the drive AC output voltage.  The output voltage is the AC voltage between the drive U, V and W terminals.
P508: Motor Current
Parameter P508 displays the current in amps that the drive is outputting (presumably to the motor). This can be useful in determining the cause of a potential overload or average working load of an application.
P527: Drive Output Frequency (Hz)
When the drive program parameter P527 is selected, the drive display will change to show the drive is output frequency. Knowing the drive output frequency will allow calculating the motor RPM by using the following formula: Motor synchronous RPM = (60 x drive output frequency) / Pole Pairs Example: Synchronous speed for a standard, 2 pole pair (4 pole) motor, connected to a drive running at 40 Hz output frequency  (60 X 40) / 2 = 1200 RPM Note: actual motor RPM will depend on the motor slip rating.

Drive Analog Signal Diagnostics

P525: DC Voltage Output Signal (TB-30)
Parameter P525 displays the 0-10 VDC output level on the drive control terminal 30. This DC voltage will depend on program parameters P150 through P155 settings.  For example: A drive operated at 30 Hz with parameter P150 is set to 1 (0-10 VDC Output frequency), P151 (Add Analog Input to TB-30 Output) set to 0 and P152 (TB-30 Frequency Scaling) set to 60, 5 VDC would be expected for Parameter P525.
P528: Network Commanded Speed Reference
Parameter P528 displays the speed (Hz) the drive is commanded run by the network. P528 is only active if a optional network control module is installed and the drive is properly programmed for network control. Compatible Networks:

  • Modbus RTU
  • CANopen
  • DeviceNet
  • Ethernet/IP
  • Profibus
  • Lecom-B
P524: PID Network Feedback Signal Value
Parameter P524 is the PID network feedback signal. While in PID mode the drive requires feedback to compare against the ideal setpoint. This can either be an analog signal or a network signal. The feedback signal gets scaled to match the real world units of the application. For example: A 0-10 VDC feedback signal would get scaled to match a 0-100 PSI system. Then it is compared against the setpoint in terms of PSI and an output is determined to compensate. P524 is the Network feedback signal after it has been scaled to the system.
P520: 0 - 10 VDC Input (TB-5) Voltage Level
Parameter P520 will show the analog DC signal externally applied to the drive control Terminal 5. Depending on the drive programming on parameters P156/P160/P161, the voltage applied on control Terminal 5 will determine the speed or torque being commanded.
P521: 4 - 20 mA Input (TB-25) Current Level
Parameter P521 displays the 4 – 20ma input current level applied to the drive control terminal 25. When selected, parameter P521 will show the analog mA current signal externally applied to the drive control terminal 25.  Depending on the drive programming parameters P156/P160/P161/P164, the current applied on control terminal 25 will determine the speed or torque being commanded.
P523: Scaled 4-20 mA Input (TB-25) for PID
Parameter P523 is the 4-20 mA network feedback signal. While in PID mode the drive requires feedback to compare against the ideal setpoint. This can either be an analog signal or a network signal. The feedback signal gets scaled to match the real world units of the application.  For example: A 4-20 mA feedback signal would get scaled to match a 0-100 PSI system. Then it is compared against the setpoint in terms of PSI and an output is determined to compensate. P523 is the 4-20 mA input feedback signal after it has been scaled.
P522: Scaled 0 - 10 VDC Input (TB-5) for PID
Parameter P522 is the 0-10 VDC network Feedback signal. While in PID mode the drive requires feedback to compare against the ideal setpoint. This can either be an analog signal or a network signal. The feedback signal gets scaled to match the real world units of the application. For example: A 0-10 VDC feedback signal would get scaled to match a 0-100 PSI system. Then it is compared against the setpoint in terms of PSI and an output is determined to compensate. P522 is the 0-10VDC input feedback signal after it has been scaled.

Drive History Diagnostics

P500/P551/P552: Fault History Data
Parameter P500 is the Fault History. By selecting parameter P500, the drive display will indicate the last faults (maximum 8) which caused the drive to trip. The format of the fault display is n.xxx, where n is the fault number (1 being newest fault) and xxx is the fault code.  Using the up drive up and down arrows will scroll through the stored faults. For assistance in identifying and resolving faults, go the the Troubleshooting section of this guide. Parameter P551 is the Fault History Timer. This parameter can be useful in determining the time when a particular fault occurred.  When P551 is selected, the drive display will begin flashing. The first set of characters that flash on the display will start with a number between 1 and 8. This number indicates the number the fault lies in the fault history. This will be followed by a dot (.) and two numbers.  These are the two most significant digits of the total power on hours at the time of the fault. The second set of characters to flash on the display will consist of two or three numbers. These are the two least significant digits of the total power on hours at the time of the fault. These numbers will count up to 999. After 999 the number will increase the most significant digit value and reset back to “000”. The third set of characters to flash on the display will start with two numbers. These reflect the minutes power was applied to the drive at the time of the fault. This will be followed by a dot (.) and two numbers.  These last two numbers indicate the seconds power was applied to the drive at the time of the fault. Pressing the up or down arrow will scroll through the faults in the fault history. The drive will continue cycling through the three displays until the keypad “Mode” button is pressed.  Parameter P552 is the Fault History Counter. This parameter can be useful in determining how many times a particular fault has occurred consecutively on a drive. For example: If a SMV has tripped on a external fault it can determine if this is a reoccurring problem by reading the number in P552. If a “3” is present in  P552 then the user knows this drive has consecutively faulted three times on this same fault without any different fault between each trip. Performing a factory reset will reset the Fault History Data.
P541: Total Power On Time
Parameter P541 is the Total Power On Time. When selected, P541 will displays the total amount of time the drive has been powered since the drive was manufactured. If when parameter P541 is selected, the drive display alternately flashes two times, the first display indicates hours less than 9999 hours and the second display indicates hours greater than 9999 hours. Performing a factory reset will not reset the Total Power On Time.  
P511: Total kW Hours
P511 is the Total Kilowatt Hours of power delivered by the drive.  This is the cumulative amount of output power the drive has supplied to the load. The value displayed is from when the drive was manufactured or from the last time the drive was reset to factory defaults. If when parameter P511 is selected, the drive display alternately flashes two times, the first display indicates kWh’s less than 9999 kWh’s and the second display indicates kWh’s greater than 9999 kWh’s.
P540: Total Run Time
Parameter P540 indicates the drive Total Run Time.  When P540 is selected the drive display will show the total amount of time the drive has been in the run mode since manufactured. If when parameter P540 is selected, the drive display alternately flashes two times, the first display indicates hours less than 9999 hours and the second display indicates hours greater than 9999 hours. Performing a factory reset will not reset the Total Run Time.  

Drive Miscellaneous Diagnostics

P560 to P564: Diagnostic Parameters Relating to Sequencer Status
P560 to P564 program parameters all relate to the status of the sequencer operation. 

  • P560: Currently active sequencer segment.
  • P561: Time since the start of the active sequencer segment.
  • P563: Number of sequencer cycles since sequencer was started.
  • P564: Number of sequencer cycles remaining in sequencer routine.
P560 to P564: Diagnostic Parameters Relating to Sequencer Status
Parameter P530 allows monitoring of the control terminal points and common drive conditions: An illuminated LED segment indicates:

  • the protective circuit is active (LED 1)
  • the Logic Assertion Switch is set to High (+)
  • input terminal is asserted (LED 2)
  • output terminal is energized (LED 4)
  • the Charge Relay is not a terminal, this segment will be illuminated when the Charge Relay is energized (LED 4).

P501: Software Version
Parameter P501 is the software version of the drive. It is displayed in the following format “x.yz” 
P503: Internal Code
Parameter P503 is the Internal code. It is essentially an extension of information regarding the software version of the drive.
P512: Drive Heatsink Temperature (Degrees C)
Parameter P512 displays the measured temperature (degrees celsius) of the drive heat sink.
P531: Keypad Status Readout
Parameter P531 allows monitoring of the keypad pushbuttons: 

  • An illuminated LED segment indicates when the button is depressed
  • LED 1 and LED 2 are used to indicate pushbutton presses on a remote keypad that is attached to the drive. LED 3 and LED 4 indicate button presses on the local drive keypad.

P505: DC Bus Voltage
By selecting parameter P505 the drive display will continuously indicate the drive’s internal DC bus voltage . The formula to calculate the expected value of drive DC bus voltage is:  AC voltage applied to the drive input terminals multiplied by the square root of 2 (1.414). For example: (240 VAC input voltage)x(1.414)  = 339 VDC Bus
P502: Drive ID
Parameter P502 displays the drive ID “N.N.NN” If the display is flashing when P502 is accessed then the Drive ID stored in EPM does not match the model it is plugged into.
P503: Internal Code
Parameter P503 is the Internal code. It is essentially an extension of information regarding the software version of the drive.

Drive Configuration Messages

When the Mode button is pressed and held, the drive’s display will provide a 4-digit code that indicates how the drive is configured. If the drive is in a Stop state when this is done, the display will also indicate which control source commanded the drive to Stop (the two displays will alternate every second).

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