Product Description:

The VT-SSPA1-525-2X/V0/0 is a plug-in proportional amplifier produced by Bosch Rexroth Indramat for the VT-SSPA Plug-in Proportional Amplifiers series. The card is installed on standard sub-modules to drive one proportional solenoid in hydraulic motion or pressure control loops. Within an automation cabinet, it scales a low-level reference into the regulated current required by associated proportional valves, enabling stable hydraulic control without separate position feedback sensors.

The amplifier operates from a supply of 24 VDC, so it can be powered directly from common industrial control buses. It accepts a command signal across the 0 to 10 V range, and this voltage span is interpreted linearly so PLC analog outputs can modulate valve position with predictable resolution. Because the input channel is analog, no internal digitization delay is introduced between reference changes and coil current. To energize the connected solenoid, the card can deliver up to 2.5 A, which is suitable for Rexroth proportional cartridges of size 25. A molded cable gland provides the electrical entry, giving strain relief and helping protect the terminals against accidental tugging.

Only one coil can be driven at a time because the hardware supports 1 solenoid output, matching the single-actuated design of the listed DBETX, DBE6X, and 3(2)FREX valve families. The amplifier is tuned for proportional valves, so the current loop maintains stable hydraulic metering rather than two-state switching. The electronics include no position feedback, so spool displacement is inferred solely from the commanded current, which simplifies wiring but requires calibrated mechanical overlap in the valve. The board weighs 0.23 kg, allowing direct insertion into Euro-card racks without adding notable mass to the control enclosure.