Rockwell Automation 1398-DDM-xxx USE MNL/ULTRA 200 DIG.SERVO.DR - Manual (Page 119)

Publication 1398-5.0 – October 1998
Power Connections 7-9
The inputs to the main (logic and motor supply) and the auxiliary
(logic supply only) power sources are separated. This permits
independent powering of the control power and the motor power. This
dual power sourcing is useful for troubleshooting and diagnostics.
Table 7.5: AC Input Power Sizing Requirements
Model Current Requirements
Input 1
(rms Amps)
Inrush
(peak Amps)
Fuse
(Amps)
Wire
(AWG)
Transformer 2
(kVA)
1398-DDM-010,
1398-DDM-010X 10 50 10 14 2
1398-DDM-020,
1398-DDM-020X 19 50 20 12 4
1398-DDM-030,
1398-DDM-030X 28 50 30 10 6
1398-DDM-075,
1398-DDM-075X
single phase 28 50 30 10 6
1398-DDM-075 3 ,
1398-DDM-075X
three phase
28 50 30 10 12
1398-DDM-150,
1398-DDM-150X 46 68 60 6 20
1. In the United States, the National Electrical Code (NEC), specifies that fuses must be selected
based on the motor full load amperage (FLA), which is not to be confused with the drive input current.
The largest fuse allowed under any circumstances is four times the motor FLA. Therefore the largest
fuse permissible for use with the ULTRA 200 Series is four times the motor rated continuous current
(converted to an RMS value). The ULTRA 200 Series has been evaluated and listed by Underwriters
Laboratories Inc. with fuses sized as four times the continuous output current of the drives (FLA),
according to UL 508C.
In almost all cases fuses selected to match the drive input current rating will meet the NEC require-
ments and provide the full drive capabilities. Dual element, time delay (slow acting) fuses should be
used to avoid nuisance trips during the inrush current of power initialization. The fuse sizes listed are
recommended values, but local regulations must be determined and adhered to.
The ULTRA 200 Series utilizes solid state motor short circuit protection rated as follows:
Short Circuit Current Rating with No Fuse Restrictions:
Suitable for use on a circuit capable of delivering not more than 5000 RMS symmetrical Amperes, 240
Volts maximum.
Short Circuit Current Rating with Fuse Restrictions:
Suitable for use on a circuit capable of delivering not more than 200,000 RMS symmetrical Amperes,
240 Volts maximum, when protected by high interrupting capacity, current limiting fuses (Class CC, G,
J, L, R, T).
2. The ULTRA 200 Series drives do not require an isolation transformer. The recommended trans-
former sizes are the minimum that is adequate for most servo applications. Larger transformers provide
an additional safety factor. The additional safety factor may occur in applications that require minimum
bus voltage sag when the motor must accelerate to high speed in minimum time or in applications with
high continuous power requirements.
3. The ULTRA 200 Series three phase products require 240 VAC line to line power. This is not available
in Europe, where the three phase power distribution is 400 VAC line to line, 240 VAC line to neutral. In
Europe a transformer is required to supply the correct three phase voltage. In Europe the ULTRA 200
Series single phase units may run directly off the line to neutral voltage.