Product Overview

The ABB OVP-1X is a specialized overvoltage protection board (often referred to as a snubber or clamp board) designed to safeguard the inverter section of ABB industrial drives. Serving as a critical shield for the power electronics, the ABB OVP-1X is specifically installed in the DC link of compatible ACS350, ACS550, and ACS800 series drives to protect IGBT modules from damaging voltage spikes generated during rapid switching transients . This board performs a highly targeted function: when an IGBT in the inverter stage switches off rapidly, the energy stored in parasitic inductances can produce a voltage spike, or “dv/dt overshoot,” on the DC bus. The ABB OVP-1X mitigates this by absorbing and clamping these potentially destructive overvoltages, thereby protecting the IGBT from exceeding its maximum rated voltage and ensuring the long-term integrity of the entire drive .

It is crucial to understand that the ABB OVP-1X is not a standalone inverter or a replacement for a dynamic braking chopper (like the NBRA series); rather, it is an integral, low-power accessory that focuses on transient protection . The board typically employs a passive RC snubber network, often supplemented by Transient Voltage Suppressor (TVS) or clamping diode circuits to provide a hard clamp on the voltage . Positioned within the power unit control compartment or mounted directly adjacent to the DC busbars, the ABB OVP-1X is a modular plug-in component, making it a field-replaceable spare part that is critical for maintaining system availability . When a malfunctioning ABB OVP-1X fails to clamp these short-duration, high-frequency spikes, the drive’s main control board may interpret the resulting DC bus overvoltage as a fault, leading to an unexpected “DC Overvoltage” or “OVP Trip” alarm and a system shutdown .

 

Technical Specifications

Parameter Name	Parameter Value
Product Model	OVP-1X
Manufacturer	ABB
Product Type	Inverter Overvoltage Protection / Snubber Board
Applicable Drives	ACS350, ACS550, ACS800 (select power segments), early SAMI Mini/Micro
Protection Form	RC Snubber (R+C Film/Ceramic) + Optional TVS/Clamping Diode Network
Installation Location	Inverter Power Unit Control Box; DC Busbar Side
DC Bus Compatibility	Typically ≤ 820 VDC (for 400V AC models); 690V models may not be compatible
Signal Interface	Ribbon cable / Pin header to RMIO/RAIO board; passive RC-only on some variants
Fault Feedback	Select variants via optocoupler send Fault signal to control board
Typical Power Loss	< 5 W (Negligible RC loss)
Mounting	PCB Socket or M3/M4 studs on insulating bracket
Operating Temperature	-10°C to +55°C (Cabinet)
Storage Temperature	-40°C to +85°C
Dimensions (approx.)	90 x 60 mm (Variant-dependent)
Weight (approx.)	0.08 kg

 

 

Main Features and Advantages

Nanosecond-Speed Voltage Spike Suppression: The ABB OVP-1X is engineered to act as the first line of defense against voltage surges that occur on the DC bus during the IGBT switching process. By employing a high-speed RC snubber circuit and, on some variants, a TVS diode network, the ABB OVP-1X reacts instantaneously to clamp transient overvoltages at the IGBT’s switching node. This fast response prevents the voltage from exceeding the critical VCESVCES​ rating of the power semiconductor, thereby preventing catastrophic short-circuit failures and ensuring the drive continues to run reliably even in heavy-duty, dynamic-load applications .

Cost-Effective Reliability for Legacy Drives: For facilities operating ABB ACS350, ACS550, and ACS800 drives, the ABB OVP-1X is an essential and cost-effective spare part. As a modular plug-in card, replacing a faulty ABB OVP-1X is a simple, field-executable task that can be performed in minutes . The board is regarded as a “Critical Spare” (A-spare) for drive availability, as the cost of a replacement board is negligible compared to the financial impact of an unplanned drive or system shutdown . Maintaining a spare ABB OVP-1X on-site ensures that a drive can be restored to full health quickly without the need for expensive, time-consuming power module replacement.

Comprehensive Diagnostic and Failure Prevention: While the ABB OVP-1X is a passive protection device, it plays an active role in the drive’s diagnostic ecosystem. A failure of the RC components (capacitance attenuation or resistor burnout) can result in a loss of protection and trigger a “DC Overvoltage” fault on the drive control panel . This behavior makes the ABB OVP-1X a critical indicator of system health, allowing maintenance personnel to identify and replace aging or damaged boards before the drive experiences an electrical failure. The board’s compact design and standard mounting allow for easy visual inspection to identify signs of thermal stress or component aging .