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Epsilon Eb Digital Servo Drive Installation Manual
Encoder Specifications
Power Dissipation
In general, the drive power stages are 90 to 95 percent efficient depending on the actual point
of the torque speed curve the drive is operating. Logic power losses on the Epsilon drive are
11 W with normal loads to 15 W with additional loads such as external encoder and low input
voltage (<22 VDC on A.P.S. or 120 VAC on AC input).
The values shown in the table below represent the typical dissipation that could occur with
the drive/motor combination specified at maximum output power.
Power Dissipation Calculation
Calculating actual dissipation requirements in an application can help minimize enclosure
cooling requirements, especially in multi-axis systems. To calculate dissipation in a specific
application, use the following formula for each axis and then total them up. This formula is a
generalization and will result in a conservative estimate for power losses.
Where:
Motor Density Output Type
Output
Frequency
Output Signals Power Supply
MG
and NT
2048
lines/rev
RS422
differential
driver
250 kHz
per channel
A, B, Z, Comm U,
Comm W, Comm V
and all complements
5V, 200 mA
±10%
Drive Model
Logic Power Losses (typ)
Drive (Pld) (Watts)
Maximum Power Stage
Losses (Pp) (Watts)
Total Power Losses (Watts)
Eb-202 / MG-205
11
25 36
Eb-202 / NT-207 25 36
Eb-202 / NT-212 30 41
Eb-203 / NT-207 30 41
Eb-203 / MG-208 55 66
Eb-203 / NT-212 55 66
Eb-203 / MG-316 60 71
Eb-205 / NT-212 55 66
Eb-205 / MG-316 72 83
Eb-205 / MG-340 88 99
Psr Pld
1500
Vmax * TRMS
TPL ++=