2198-C2055-ERS — Kinetix 5500 Dual-Axis Converter Module, 55A, 460V, Safe Speed Monitor

The 2198-C2055-ERS is a high-current converter module for the Kinetix 5500 servo drive system. It converts three-phase AC mains to a shared 650V DC bus that feeds a group of Kinetix 5500 axis (inverter) modules, centralizing the AC input for a multi-axis servo installation. The 55A AC input current rating makes this the largest converter in the standard 2198-C series — it's specified for high-power multi-axis systems where four to eight servo axes share a common bus and the total continuous power demand is substantial.

The "-ERS" suffix indicates the module includes integrated Safe Speed Monitor safety functionality, which provides a hardware-level speed monitoring output independent of the controller program. As with the smaller Kinetix 5500 converter modules, the regenerative energy exchange between axes on the shared bus is a key system efficiency advantage — the converter's role in enabling that exchange scales up with the 55A rating to support larger axis groups with higher power motors.

Specifications

Parameter	Value
Part Number	2198-C2055-ERS
Series	Kinetix 5500
Rated AC Input Current	55 A
Input Voltage	400–480V AC, Three-Phase
DC Bus Output Voltage	~650V DC (nominal at 480V AC)
Safety Function	Safe Speed Monitor (ERS — SIL 2 / PLd)
Shared Bus	Yes — feeds multiple 2198-Hxxx axis modules
Integrated Pre-charge	Yes
Regenerative Capability	No (passive diode rectifier; braking via axis modules)
Cooling	Forced air (internal fan)
Enclosure	IP20
Operating Temperature	0°C to 50°C
Standards	UL 508C, CE, IEC 61800-5-1, IEC 62061 (SIL 2)

Shared Bus at 55A — What Changes at This Power Level

The smaller Kinetix 5500 converters (10–20A) suit systems with two to four light-duty servo axes — pick-and-place robots, small assembly cells, label applicators. At 55A, the converter is specified for larger systems: multi-axis gantry systems, large packaging machines with multiple servo-driven stations, forming and stamping lines with high-power servo feeds and clamping axes.

The physical installation demands also scale. A 55A AC input at 480V three-phase requires appropriately rated input conductors, a branch circuit breaker or fuse set rated for the drive system's fault interrupting requirements, and a wiring layout that keeps the input feed and the DC bus connections short and properly rated. At this current level, under-rated connections cause resistive heating that can become a serious reliability issue — torque specifications on all power terminals must be met precisely during installation.

Cooling becomes more critical at 55A than at lower current ratings. The module includes an internal cooling fan; verify the panel has adequate airflow to dissipate the heat the converter and its attached axis modules produce. Recirculating hot air from one module's exhaust into another's intake is a common cause of overtemperature faults in multi-axis panels that were sized for worst-case current but not for worst-case thermal management.

Sizing the Converter for a Multi-Axis Group

The 55A rating represents the maximum continuous AC input current the converter can sustain. The total current drawn by all axis modules on the shared bus must stay within this limit. The sizing process involves three calculations run across all axes simultaneously:

RMS current per axis: the root-mean-square output current of each axis over one complete motion cycle. This is derived from the torque profile — acceleration torque, running torque, deceleration torque — and the duty cycle. RMS current, not peak current, determines thermal loading.
Sum of RMS currents: the RMS currents of all axes are added (or summed in quadrature if the phases are independent). This total must be below the converter's 55A continuous rating.
Peak current demand: even if the average current is within rating, momentary simultaneous peak current from multiple axes accelerating at the same time can exceed the bus voltage headroom. Verify peak current events against the bus capacitance available to absorb them without voltage drooping below the axis modules' undervoltage limits.

Motion Analyzer software automates this calculation from the axis motion profiles and motor selections. Running this analysis before finalizing the hardware configuration avoids discovering a converter undersizing issue during commissioning.

FAQ

Q: How many Kinetix 5500 axis modules can a single 2198-C2055-ERS support?

There's no fixed maximum number — it depends on the RMS current demand of all axes combined. A group of eight small axes with light duty cycles may stay within 55A; three large axes at heavy duty cycles may exceed it. Run the multi-axis sizing calculation in Motion Analyzer with the actual motor and motion profile data to determine the right answer for a specific application.

Q: Can this converter be used with Kinetix 5700 axis modules?

No. The 2198-C series converters are specific to the Kinetix 5500 system and its bus bar connection architecture. Kinetix 5700 uses different bus supply modules from its own product series that are not interchangeable with Kinetix 5500 converters.

Q: Is an external braking resistor always required with this converter?

Not necessarily. If the motion profiles of the axis group are well balanced — regenerative energy from decelerating axes is mostly consumed by simultaneously accelerating axes — the net regenerative energy reaching the bus capacitors may be manageable without a resistor. For systems with unbalanced profiles or emergency stop scenarios where all axes decelerate simultaneously, braking resistors on individual axis modules are needed. Motion Analyzer models this energy balance.

Q: What input fusing is required for the 55A converter?

Semiconductor-rated fuses (Class J or equivalent) sized per the drive system's installation requirements are specified rather than standard thermal-magnetic circuit breakers. Semiconductor fuses respond fast enough to protect the converter's rectifier diodes from fault current pulses that standard breakers respond to too slowly. Follow the 2198-C2055-ERS installation documentation for the specific fuse type and rating required for the input voltage and bus configuration in use.

Q: Does the ERS safety function need to be validated separately from the axis drive commissioning?

Yes. The ERS safety function must be validated as a separate step. Testing involves verifying that the speed limit activates the safety output correctly, that the feedback monitoring detects feedback loss or discrepancy faults, and that the safe state is achieved within the rated response time. This validation must be documented in the machine's safety file as part of the functional safety assessment — it is not automatically covered by standard axis commissioning and motion testing.

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