PST6250.114-L Bosch Rexroth Indramat
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MPN: R911170775
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The Bosch Rexroth Indramat PST6250.114-L is part of the PST Thyristor Power Units series and features a 2-phase thyristor power stage with a mains nominal current of 200 Amps. This air-cooled unit has an IP20 ingress protection rating and supports a 24 V DC logic supply. The power unit allows a maximum operating altitude of 2000 meters and offers transformer power ratings of 224 kVA at 20 percent duty and 141 kVA at 50 percent duty.
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Product Description:
The PST6250.114-L is a thyristor power unit produced by Bosch Rexroth Indramat within the PST Thyristor Power Units series. It serves as the controlled power stage in resistance welding equipment and other automation tasks that require short, high-current pulses. By switching two anti-parallel thyristors per phase, the unit regulates the primary side of a welding transformer so that secondary current follows the profile commanded by a supervisory controller.
The power section is built around a two-phase thyristor bridge that carries a continuous mains current of 200 A; this figure represents the maximum RMS current the silicon devices can withstand without thermal overload. Control electronics are supplied from a separate 24 V DC rail, and all command signals use a 24 V discrete I/O interface for direct connection to standard PLC hardware. When operated at a 20% duty cycle, the unit can deliver 224 kVA to the welding transformer, while a 50% duty cycle reduces permissible power to 141 kVA to keep junction temperatures within safe limits. The enclosure carries an IP20 rating, which provides finger-safe protection when the device is mounted inside a panel. Auxiliary circuitry is supported by a 2 A low-current output, and large 95 mm² terminals limit conductor heating. An integrated MOV network provides overvoltage suppression on the mains bus.
Cooling relies on forced air, and total thyristor plus inductor losses may reach 360 W; an additional cabinet base loss of 69 W must be removed by the panel ventilation system. Ambient air at the intake must not exceed 45 °C, and at least 100 mm of free space around the vents is required to maintain airflow. The assembly is approved for operation up to 2000 m above sea level under Climate Class 3K3, allowing full output in most plant environments without derating.
Frequently Asked Questions about PST6250.114-L:
Q: What is the mains nominal current rating for the PST6250.114-L thyristor power unit?
A: The mains nominal current rating for the PST6250.114-L is 200 A, making it suitable for high-power applications.
Q: How is the PST6250.114-L power unit cooled and what is the installation clearance requirement?
A: This unit is air cooled and requires a minimum installation clearance of 100 mm to allow proper airflow.
Q: What type of I/O interface and logic supply voltage are used with the PST6250.114-L?
A: The PST6250.114-L supports a 24 V discrete I/O interface and operates on a 24 V DC logic supply for control connections.
Q: What is the ingress protection (IP) rating of the PST6250.114-L thyristor power unit?
A: The ingress protection rating for this power unit is IP20, offering basic protection against solid objects but no moisture protection.
Q: What is the transformer power capacity of the PST6250.114-L at 20% duty cycle?
A: For operation at 20% duty cycle, the PST6250.114-L handles transformer power up to 224 kVA, enabling substantial intermittent loads.
