Emerson Epsilon Eb Digital Servo Drive Transformer Sizing, Single Phase Power Supply Connections

Installation

Figure 10: Single Phase Power Supply Connections

Transformer Sizing

If your application requires a transformer, use the following table for sizing the KVA rating. The values in the table are based on “worst case” power usage and can be considered a conservative recommendation. You can down-size the values only if the maximum power usage is less than the transformer continuous power rating. Other factors that may influence the required KVA rating are high transformer ambient temperatures (>40° C or >104° F) and drive operation near the maximum speeds.

Drive/Motor Combination	Suggested KVA Rating
Eb-202/NT-207	1.0
Eb-203/NT-207	1.0
Eb-202/NT-212	1.2
Eb-203/NT-212	1.7
Eb-203/MG-316	2.3
Eb-205 / MG-340	3.0

Transformer output voltage drop may become a limiting factor at motor speeds and loads near maximum ratings. Typically, higher KVA transformers have lower voltage drop due to lower impedance.

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