digifas 7112 Kollmorgen
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The Kollmorgen digifas 7112 is part of the DIGIFAS 7000 Servo Amplifiers series. It features a rated connected load of 7 kVA and a DC bus voltage of 560 VDC. This amplifier has a peak output current of 24 Arms and weighs 7.9 kilograms, with an IP20 protection class.
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Product Description:
The digifas 7112 servo amplifier is manufactured by Kollmorgen within the DIGIFAS 7000 Servo Amplifiers series. The unit interfaces between an industrial controller and a brushless motor, converting a fixed DC bus into a regulated three-phase output that follows velocity or torque commands. By modulating current precisely, it allows automated machines such as packaging stations, pick-and-place axes, and material-handling gantries to achieve repeatable motion profiles under dynamic load conditions.
The amplifier draws energy from a DC link of 560 VDC and delivers a continuous phase current of 12 Arms, while short bursts reach 24 Arms for rapid acceleration. Current regulation is executed by a loop with a 1 kHz bandwidth, so commanded torque settles within one millisecond. An internal monitor trips the drive if the link rises to 750 VDC, protecting downstream components. The current form factor is 1.01, keeping RMS and average values nearly identical. Thermal energy produced during operation is 140 W at rated current. A built-in 200 W ballast and support for up to 2 kW of external braking resistors dissipate regenerative peaks, provided system resistance remains above 50 Ω. Motors with inductance no lower than 3.5 mH are supported, and the residual voltage drop across the inverter is limited to 5 V.
An output stage clock of 8.33 kHz minimizes ripple torque and acoustic noise while staying within typical switching-loss limits for insulated-gate devices. The supply section is rated for 7 kVA, matching medium-inertia servo axes found in multi-axis gantries or web-handling lines. Installation inside a control cabinet is expected because the housing carries an IP20 protection class, requiring a controlled environment but simplifying heat removal through forced convection. With a mass of 7.9 kg, the module can be mounted on standard DIN rail or panel brackets. During rapid deceleration cycles, the internal and external ballast paths absorb regenerative energy so the DC bus stays below the trip level.
