Description
Key Technical Specifications
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Model Number: SNAT 0713 BDB
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Manufacturer: ABB
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Order Code: 3BFE58421618
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Function: Gate-driver & status feedback for 6-pack IGBT or SCR bridges
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Logic Supply: 24 VDC (18-30 V), 150 mA
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Output Channels: 6 × 15 V gate pulses, 3 A peak, 1 µs rise-time
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Isolation: 2 kV primary-to-power, 500 V channel-to-channel
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Protection: Under-voltage lock-out, desaturation detection, fiber-fail
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Status LEDs: Green “Ready”, Red “Fault”, Yellow “Fire”
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Temperature Range: –40 °C…+70 °C
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Dimensions: 160 × 100 × 25 mm, 0.64 kg
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Mounting: Plug-in, 96-pin DIN 41612, retained by two screws
Field Application & Problem Solved
Medium-voltage drives (380-690 V) need a translator that turns 24 V TTL from the CPU into 15 V / 3 A gate pulses that can charge 600 A IGBT modules in < 1 µs. Drop the SNAT 0713 BDB into the TyRak-S rack and you get six isolated firing channels plus desat feedback—no external gate resistors, no fiber bundles. I’ve used these on a 2.5 MW chipper in Georgia: one board drives the whole 6-pack, reports “DESAT” if a module shorts, and shuts down the DC link before the fuse blows. Value: it collapses six individual gate drivers, a monitoring opto, and a fiber interface into one plug-in card you can swap in five minutes without pulling the cell.
Medium-voltage drives (380-690 V) need a translator that turns 24 V TTL from the CPU into 15 V / 3 A gate pulses that can charge 600 A IGBT modules in < 1 µs. Drop the SNAT 0713 BDB into the TyRak-S rack and you get six isolated firing channels plus desat feedback—no external gate resistors, no fiber bundles. I’ve used these on a 2.5 MW chipper in Georgia: one board drives the whole 6-pack, reports “DESAT” if a module shorts, and shuts down the DC link before the fuse blows. Value: it collapses six individual gate drivers, a monitoring opto, and a fiber interface into one plug-in card you can swap in five minutes without pulling the cell.
ABB SNAT-0713BDB
Installation & Maintenance Pitfalls (Expert Tips)
Fiber not clicked = no pulses – The board sends “Fire OK” only when the Tx/Rx fibers are latched. Techs leave the latch half-open; the drive faults on “Missing Ack” and you chase ghosts in the software. Push until you hear the click.
Gate resistor legend tiny – Factory default is 2.2 Ω. If you retrofit 1.7 kV modules you need 3.3 Ω or the turn-on dv/dt punches through. Swap the SMD resistor or the module dies in a week.
24 V ripple > 2 V shuts it down – Old battery chargers float at 29 V with 3 Vpp ripple. The UVLO trips at 16 V and you get random “Under-V” faults. Add a 470 µF / 50 V cap across the supply pins and be done.
Forget the screws and it walks out – Vibration from the cooling fan lifts the board until pins 1-6 lose contact; the drive faults on “Phase-Loss”. Snug both retaining screws or the next trip will be at 2 a.m.
Fiber not clicked = no pulses – The board sends “Fire OK” only when the Tx/Rx fibers are latched. Techs leave the latch half-open; the drive faults on “Missing Ack” and you chase ghosts in the software. Push until you hear the click.
Gate resistor legend tiny – Factory default is 2.2 Ω. If you retrofit 1.7 kV modules you need 3.3 Ω or the turn-on dv/dt punches through. Swap the SMD resistor or the module dies in a week.
24 V ripple > 2 V shuts it down – Old battery chargers float at 29 V with 3 Vpp ripple. The UVLO trips at 16 V and you get random “Under-V” faults. Add a 470 µF / 50 V cap across the supply pins and be done.
Forget the screws and it walks out – Vibration from the cooling fan lifts the board until pins 1-6 lose contact; the drive faults on “Phase-Loss”. Snug both retaining screws or the next trip will be at 2 a.m.
Technical Deep Dive & Overview
Internally the SNAT 0713 BDB is a six-channel gate-driver built around a custom HVIC. Each channel has a 2 W push-pull stage, a desat comparator, and a fiber-optic transceiver. When the CPU issues a 3.3 V CMOS pulse the local DSP stretches it to the required width, adds dead-time, and fires the gate through a 1:1 gate-drive transformer. Desat detection kicks in at 7 V; if Vce climbs while the gate is high the channel shuts down in < 5 µs and sends “Fault” over the fiber. All six channels share one 24 V input and one fault line—pull it low and every channel shuts off simultaneously. No cooling fan required; the board dissipates about 2 W average and is rated for convection up to 70 °C.
Internally the SNAT 0713 BDB is a six-channel gate-driver built around a custom HVIC. Each channel has a 2 W push-pull stage, a desat comparator, and a fiber-optic transceiver. When the CPU issues a 3.3 V CMOS pulse the local DSP stretches it to the required width, adds dead-time, and fires the gate through a 1:1 gate-drive transformer. Desat detection kicks in at 7 V; if Vce climbs while the gate is high the channel shuts down in < 5 µs and sends “Fault” over the fiber. All six channels share one 24 V input and one fault line—pull it low and every channel shuts off simultaneously. No cooling fan required; the board dissipates about 2 W average and is rated for convection up to 70 °C.
