Product Description:

The VT-SSPA1-5-1X/V0/0-24 is a plug-in proportional amplifier card produced by Bosch Rexroth Indramat for the VT-SSPA Plugin Proportional Amplifiers series. Installed in control cabinets, it drives proportional solenoid valves by converting a voltage command into regulated coil current for hydraulic control tasks. The module supports closed-loop hydraulic motion but has no internal position feedback, so external sensors must handle any positional supervision required by the axis. This arrangement suits valve-control applications in which the amplifier regulates current while a separate control layer monitors actual movement.

The amplifier operates from a supply of 24 VDC and can deliver up to 1.2 A of controlled current to a connected solenoid. A high input impedance of 20 kΩ minimizes loading on the command source, while the internal pulse-width-modulation clock of 200 Hz helps shape current resolution and valve acoustics. Field wiring enters through a PG11 cable gland, and the four screw terminals accept the control signal, supply, and reference lines. The bias current is 0 mA, so the card starts at zero output, and its design tolerates cable inductance up to 100 µH without control instability. Electrical mounting inside the rack uses M3 × 40 mm screws, and the valve connection uses a solenoid plug with 2 + PE pins.

The enclosure has an IP65 rating when the housing and gland are properly sealed, which helps keep dust and water jets away from the electronics. The valve side mates with the industry interface EN 175301-803, and the coil resistance of 4.77 Ω suits the card’s current range for linear control. Reliable dither requires a minimum coil inductance of 15 mH, because lower values can overheat the driver stage. No position feedback path is present on the board, and best results depend on terminating the cable shield and protective earth at the same ground point.