121-236 Pacific Scientific
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The Pacific Scientific 121-236 is part of the SC750 Servo Drives series and has a continuous current of 3.8 Amps with a peak current of 7.5 Amps. This servo drive features natural convection cooling and can reach a peak power output of 2200 Watts. It has a recommended transformer rating of 3 KVA and weighs 5.9 kilograms.
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Product Description:
The 121-236 is a digital servo drive produced by Pacific Scientific for the SC750 Servo Drives series. Designed for mid-range motion axes, the unit interfaces with a machine controller to modulate three-phase motor windings according to torque or velocity commands. By integrating current sensing, pulse-width modulation switching, and fault monitoring in one package, it provides the regulated power needed to position rotary or linear servomotors in automated assembly lines, packaging cells, and material-handling equipment.
The current loop supports a continuous output of 3.8 A, which is the maximum steady-state phase current the internal power stage can carry without thermal derating. For dynamic moves such as indexing or rapid deceleration, the electronics allow a momentary surge of up to 7.5 A. This peak current increases the available torque range while keeping the power electronics within safe operating limits. During these transients, the drive can deliver up to 2200 W to the motor terminals, converting DC-bus energy into mechanical power across the pulse-width modulation frequency range. Internally, the switching and control circuits dissipate no more than 45 W, and the aluminum chassis removes this heat through natural convection without forced-air accessories.
Incoming power should be supplied by a transformer with a recommended rating of 3 kVA. This capacity provides sufficient headroom for charging the DC bus and supporting changing motor loads without excessive supply-voltage sag. When mounted inside a control cabinet, the unit’s weight of 5.9 kg must be considered, especially when multiple axes share the same back panel. The mounting surface must provide adequate structural support for the combined load of the installed drives. Proper spacing around the heat sink maintains vertical airflow and allows heat to rise away from the chassis during continuous cycling. Unobstructed airflow also helps the drive maintain its stated thermal performance when installed in industrial enclosures with elevated ambient temperatures.
