PST6250.627-L Bosch Rexroth Indramat
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MPN: R911309354
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The Bosch Rexroth Indramat PST6250.627-L is a thyristor power unit from the PST Thyristor Power Units series with a nominal system current of 200 Amps. It features air cooling, a DeviceNet fieldbus interface, and supports up to 8 discrete inputs and outputs each. This unit has a cabinet power loss of 70 Watts and operates at a maximum ambient temperature of 55°C with an IP20 protection rating.
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Product Description:
The PST6250.627-L belongs to the PST Thyristor Power Units series manufactured by Bosch Rexroth Indramat. This three-phase cabinet module is a thyristor pack that modulates line voltage to supply welding transformers or other high-current loads used in automated production cells. By gating its SCR pairs in precise phase angles, the unit converts mains power into a controlled secondary current profile so that resistance welding, heat staking, or similar processes can be synchronized with robot or PLC motion sequences.
The unit releases only 70 W of cabinet power loss, and the specified air-cooled heat sink keeps internal silicon junctions within their thermal limits without external liquid loops. Control wiring is simplified by 8 discrete inputs for trigger or mode commands and eight discrete outputs for status feedback. Logic electronics are powered from an isolated 24 V DC supply, while the thyristor stack carries a nominal system current of 200 A at the plant’s utility frequency of 50/60 Hz. DeviceNet connectivity handles parameter download, real-time current setpoints, and built-in timer functions for DeviceNet operation. Operation is allowed up to a 50% duty cycle so that silicon temperature rise stays within design margins, and reliable firing is maintained at installation altitudes as high as 2000 m above sea level.
The power unit runs in ambient temperatures up to 55 °C and is matched to transformers rated as high as 250 kVA. Line conductors up to 95 mm² can be landed on its terminals, accommodating copper cabling sized for the rated current. A metal-oxide varistor array clamps overvoltage transients generated by inductive loads, while the overall assembly carries an IP20 protection rating that prevents accidental finger contact with live parts inside standard control enclosures.
Frequently Asked Questions about PST6250.627-L:
Q: What is the maximum transformer rating compatible with the PST6250.627-L?
A: The PST6250.627-L supports a maximum transformer rating of 250 kVA, allowing for high-power industrial applications.
Q: How many discrete inputs and outputs are available on the PST6250.627-L?
A: This unit features both 8 discrete inputs and 8 discrete outputs for flexible system integration.
Q: What cooling method is utilized by the PST6250.627-L power unit?
A: Air cooling is used to maintain the temperature of the PST6250.627-L during operation.
Q: Which fieldbus interface is included with the PST6250.627-L?
A: The PST6250.627-L is equipped with a DeviceNet fieldbus interface.
Q: What is the nominal system current for the PST6250.627-L model?
A: This model is rated for a nominal system current of 200 A, suitable for demanding electrical loads.
