Troubleshooting of Siemens MASTER DRIVES VC

6.2 Analog Output (AA)

P655: Select the output parameter number (such as r004 output current, r218 frequency actual value)

P656: Gain (voltage value at 100% corresponding to 10V)

P657: Offset

Calculation example: 0-10V corresponds to 32-160A (rated current 40A).

Reference quantity 4 × P102=160A. According to the formula P656.2=12.5V, P657.2=-2.5V.

Interpretation of Control Words and Status Words

7.1 Control Word 1 (r550)

Key position:

Bit 0: ON/OFF 1 (rising edge start)

Position 1: OFF2 (pulse lock, free parking)

Position 2: OFF3 (Quick Stop)

Position 3: Inverter Enable

Bit 7: Fault reset (edge triggered)

Position 11/12: Forward and Reverse

Position 13/14: Electric potentiometer up/down

All command sources can be freely connected through parameters (such as P554 selecting ON/OFF 1 source, default PMU button).

7.2 Status Word 1 (r552)

Important information:

Position 0: Ready to power on

Position 1: Ready

Position 2: Running

Bit 3: Fault (Low level output indicates' faulty ')

Position 12: The main contactor has been engaged

Position 13: Slope generator activation

The status bit can be assigned to digital output (such as P603.1=1002 outputting "fault" to BA2).

Common alarm codes and their handling

Alarm meaning countermeasures

A020 overcurrent check load, reduce ramp time

A022 Inverter Overheating Inspection: Fan, Environmental Temperature, and Heat Dissipation

A025 I ² t frequency converter reduces load or increases pulse frequency

A029 I ² t motor inspection motor cooling, increase P363

A033 overspeed increases P452/P453 or reduces regeneration load

A034 set/actual deviation too large check torque limit, increase P517

A041 Vdmax controller prohibits checking input voltage and P071

A078 Static measurement to be executed with ON command given within 20 seconds

Maintenance and fault records

The frequency converter has built-in fault records (r947, r949), which can store up to 8 trip times (r748) and fault values. It is recommended that engineering personnel regularly export and fill in the logbook provided with the equipment. When replacing the CU board, it is necessary to initialize with P052=2 and input the correct MLFB (P070), otherwise the power unit cannot be matched.