6SE7021-3TP50-Z SIMOVERT MASTERDRIVES

SKU: 6SE7021-3TP50-Z Category: Drive

Description
Additional information

The Siemens SIMOVERT MASTERDRIVES 6SE7021-3TP50-Z is a vector control AC drive belonging to Siemens' SIMOVERT MASTERDRIVES MC (Motion Control) and VC (Vector Control) series. This unit is designed for variable-speed control of three-phase asynchronous and synchronous motors, offering precise speed and torque regulation in demanding industrial environments. The 6SE7021-3TP50-Z variant is a compact chassis-mounted inverter unit rated for a power output in the 7.5 kW range at 400 V AC supply.

The SIMOVERT MASTERDRIVES series features a modular hardware architecture allowing integration of optional communication boards, technology boards, and encoder evaluation modules. The drive supports multiple control modes including V/f control, sensorless vector control, and closed-loop field-oriented vector control. It includes a built-in DC bus interface enabling multi-axis configurations with shared DC link, integrated brake chopper capability, and comprehensive protection functions such as overcurrent, overvoltage, undervoltage, and overtemperature monitoring. Parameterization is performed via the PMU operator panel or through SIMATIC STEP 7 / DriveMonitor software using the USS or PROFIBUS-DP interface.

The 6SE7021-3TP50-Z is widely deployed in machine tool spindle drives, conveyor systems, hoisting equipment, pumps, fans, and compressors across the automotive, steel, paper, and general manufacturing industries. Its closed-loop vector control capability makes it suitable for applications requiring high dynamic response and precise torque control at low speeds. The shared DC bus architecture is particularly advantageous in multi-axis machinery where regenerative energy from braking axes can be reused by motoring axes.

Technical Specifications

Series	SIMOVERT MASTERDRIVES VC
Input Voltage	380 – 480 V AC, 3-phase
Output Power	7.5 kW
Output Current (Continuous)	13 A
Input Frequency	47 – 63 Hz
Control Type	V/f, sensorless vector control, closed-loop field-oriented vector control
Communication Interface	USS (RS-485); optional PROFIBUS-DP via CB board
Switching Frequency	2.5 – 16 kHz (adjustable)
Operating Temperature	0 °C to +40 °C (derating above 40 °C)
Storage Temperature	-25 °C to +70 °C
Relative Humidity	≤ 95 % (non-condensing)
Protection Rating	IP20
Mounting	Chassis (panel mounting)
Braking Resistor Support	Yes, integrated brake chopper
Certifications	CE, UL, cUL

Common Fault Codes

F001: Overcurrent: Output current has exceeded the permissible limit, typically caused by a short circuit, motor fault, or excessively fast acceleration ramp.
Check motor wiring for short circuits, verify motor data parameters, and extend the acceleration ramp time (P462/P464).
F002: Overvoltage: DC link voltage has exceeded the maximum permissible level, often caused by regenerative energy during deceleration.
Extend the deceleration ramp time (P464), verify the braking resistor connection, or enable the Vdc-max controller.
F003: Undervoltage: DC link voltage has dropped below the minimum threshold, indicating a supply voltage interruption or dip.
Check the input supply voltage and connections. Verify that the supply is within the rated range of 380–480 V AC.
F004: Drive Overtemperature: The heatsink or internal temperature has exceeded the permissible limit.
Check that cooling fans are operational, ensure adequate ventilation clearances, and verify that the ambient temperature does not exceed 40 °C.
F005: Motor Overtemperature: The motor thermal model or PTC/KTY sensor has detected excessive motor temperature.
Check motor load conditions, verify motor cooling, and check PTC/KTY sensor wiring and parameter settings (P561).
F011: Ground Fault: An earth fault has been detected on the output phases.
Disconnect the motor and check motor winding insulation resistance to earth. Inspect output cabling for insulation damage.
F023: Output Phase Failure: One or more output phases are missing or have an open circuit.
Check motor cable connections at the drive output terminals and at the motor terminal box. Verify cable continuity.
F025: PROFIBUS / Communication Fault: Loss of communication on the fieldbus interface board.
Check PROFIBUS cable connections and termination resistors. Verify master controller is active and check CB board seating in the option slot.

Frequently Asked Questions

What is the power rating and output current of the 6SE7021-3TP50-Z?

The 6SE7021-3TP50-Z is rated for 7.5 kW output power with a continuous output current of approximately 13 A at a 400 V AC supply voltage.

Does this drive support PROFIBUS-DP communication?

PROFIBUS-DP is not built in as standard but can be added by installing an optional Communication Board (CB) in the drive's option slot, such as the CBP2 PROFIBUS board.

Can the 6SE7021-3TP50-Z be connected to a shared DC bus?

Yes, the SIMOVERT MASTERDRIVES series supports a common DC bus configuration, allowing multiple inverter units to share a DC link so that regenerative energy from braking drives can be utilized by motoring drives.

What software is used to parameterize this drive?

The drive can be parameterized using the PMU operator panel directly on the unit, or via a PC using Siemens DriveMonitor or STARTER software connected through the USS/RS-485 serial interface.

What encoder types are supported for closed-loop vector control?

Encoder evaluation requires an optional Sensor Module or technology board. The drive supports incremental TTL encoders and, with appropriate option boards, resolver and SSI absolute encoders.

Troubleshooting

Drive displays F001 overcurrent fault immediately upon start

Check output terminals for phase-to-phase or phase-to-earth short circuit. Verify motor insulation resistance with a megohmmeter. Confirm motor nameplate data matches parameters P101–P109.

Repair any wiring faults or motor insulation failures. Re-enter correct motor data and perform a motor identification run (P115). Extend acceleration ramp time in P462.

Drive powers up but display shows no output and motor does not run

Check that the enable signal (terminal 63 or PROFIBUS control word) is active. Verify that the ON/OFF command is being sent correctly. Check for any active fault or alarm codes on the PMU display.

Ensure all enable and run permissive signals are correctly wired and active. Acknowledge any latched faults using the PMU or via the control word. Check parameter P554 (source of ON command) is set correctly.

Heatsink overtemperature fault (F004) occurring during normal operation

Inspect the cooling fan at the base of the drive for rotation and airflow. Check that ventilation clearances above and below the unit are maintained (minimum 100 mm). Measure ambient temperature inside the control cabinet.

Clean or replace the cooling fan if faulty. Ensure cabinet ventilation is adequate and ambient temperature is within specification. Reduce the switching frequency (P761) to lower heat dissipation if operating near thermal limits.

Erratic speed or poor torque performance in vector control mode

Check encoder wiring and shield connections if operating in closed-loop mode. Verify that motor data parameters (P101–P109) are correctly entered. Check if motor identification (P115) has been performed.

Re-enter accurate motor nameplate data and repeat the motor identification routine. Inspect encoder cable for noise interference and ensure the shield is grounded at one end only. Adjust speed controller gain parameters P235 and P240 if oscillation persists.

PROFIBUS communication fault (F025) causing drive to trip

Check the CB board is firmly seated in the option slot. Verify PROFIBUS cable termination at both ends of the network segment. Confirm the drive's PROFIBUS address (P918) matches the master configuration.

Reseat the CB board and secure the option slot cover. Replace or re-terminate PROFIBUS connectors as needed. Correct the node address in P918 and update the master PLC hardware configuration to match.

Condition	Repair, Used, Refurbished, New in box (sealed)