Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual - Manual (Page 112)

Publication 1398-5.2 – PDF 1997
7-8 Power Connections
Table 7.4: AC Input Power Sizing Requirements
Drive Model Input Current Inrush
Current
Fuse
Size 1
Wire Size
mm (AWG)
Transformer Size a
1398-DDM-005 or
1398-DDM-005X
5 A AC
rms
75 A peak 5 A 1.5 (16) 1 kVA min 100 kVA
max
1398-DDM-009 or
1398-DDM-009X
9 A AC
rms
100 A peak 10 A 2.5 (14) 2 kVA min 100 kVA
max
1398-DDM-019 or
1398-DDM-019X
18 A AC
rms
100 A peak 20 A 4.0 (12) 4 kVA min 100 kVA
max
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 cur-
rent. The largest fuse allowed under any circumstances is four times the motor FLA. Therefore the
largest fuse permissible for use with the ULTRA 100 Series is four times the motor rated continu-
ous current (converted to an RMS value). The Digital Servo Drive 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
requirements 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 100 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).
a. Technical Note Number 1 details Transformer Sizing requirements for a variety of applications.