BTA20.3-NB-PN-VB-BN Bosch Rexroth Indramat
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MPN: R911285858
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The Bosch Rexroth Indramat BTA20.3-NB-PN-VB-BN belongs to the BTA20 Machine Control Boards series and features four digital inputs, eight digital outputs, and three enabling circuits. The board supports two E-stop circuits rated at up to 2 Amps DC and 3 Amps AC, with switching voltages of 24 V DC or 42 V AC. Its front panel carries an IP65 protection rating, and overall dimensions are 169 mm in height, 407 mm in width, and 148 mm in depth.
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Product Description:
The BTA20.3-NB-PN-VB-BN is a modular machine control board produced by Bosch Rexroth Indramat as part of the BTA20 Machine Control Boards series. Its width of 407 mm, height of 169 mm, and depth of 148 mm allow it to mount behind an operator console on milling, turning, or transfer equipment. The board forms the local interface between the master CNC and field devices, handling motion overrides, emergency shutdown logic, and serial communication so that axis drives and auxiliary equipment remain synchronized with the main program sequence.
Control inputs and outputs are sized for standard peripheral loads. The board provides 4 digital inputs for direct monitoring of limit sensors and 8 digital outputs that can drive solenoids or indicator lamps through the internal 24 V supply. It includes 2 emergency stop circuits, and each path can interrupt power with a switching capacity of 2 A DC / 3 A AC. The associated contacts are rated for 24 V DC or 42 V AC. Feed motion can be increased to 120% of the programmed speed by turning the front-panel potentiometer fully clockwise. A regulated 200 mA 24 V auxiliary output powers feedback encoders, and two override knobs allow coarse adjustment without using the CNC software.
Signal routing and environmental protection are addressed on the control board itself. The board uses 3 enabling circuits, and all of them must be closed before drive power is released, adding an interlock layer beyond the emergency stop function. The aluminum bezel has an IP65 front panel rating, so dust and coolant spray cannot reach the electronics from the front. For program uploads or remote diagnostics, the unit provides 2 RS422 ports on a 15-pin connector, allowing noise-immune differential links over long cable runs. Spindle velocity never falls below 45% of the programmed value when the override dial is at its lowest detent, which helps prevent stall conditions on high-inertia tooling.
Frequently Asked Questions about BTA20.3-NB-PN-VB-BN:
Q: How many digital inputs are available on the BTA20.3-NB-PN-VB-BN control board?
A: The BTA20.3-NB-PN-VB-BN provides 4 digital input channels for signal processing.
Q: What is the protection rating for the front panel of the BTA20.3-NB-PN-VB-BN?
A: This model has a protection rating of IP65 at the front panel, ensuring resistance to dust and low-pressure water jets.
Q: What is the E-stop switching current specification for the BTA20.3-NB-PN-VB-BN?
A: The E-stop switching current is rated at 2 A DC or 3 A AC for safety circuit operation.
Q: How many RS422 ports does the BTA20.3-NB-PN-VB-BN provide and what connector do they use?
A: There are 2 RS422 ports, each using a 15-pin connector for communication on this board.
Q: What are the spindle override minimum and feed override maximum values for this control board?
A: The spindle override minimum is set at 45% while the feed override maximum reaches 120%.
