Rockwell Automation 1391 USER MNL/DIGITAL AC SERVO DR - Manual (Page 68)

Chapter 7
Installation
7-7
Table 7.B
Minimum Transformer Wire Sizes – AWG (mm
2 )
Input Voltage
208V AC
240V AC
380V AC
415V AC
480V AC
575V AC
1.5
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
3.5
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
5.0
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
#12 (2.5)
10.0
#8 (6)
#8 (6)
#10 (4)
#12 (2.5)
#12 (2.5)
#12 (2.5)
12.5
#8 (6)
#8 (6)
#10 (4)
#10 (4)
#10 (4)
#12 (2.5)
15.0
#6 (10)
#8 (6)
#8 (6)
#10 (4)
#10 (4)
#10 (4)
kVA
Important: The transformer primary requires protection by means of a
customer supplied branch circuit disconnect device. Refer to Appendix B.
Fusing (Transformer Primary)
Time delay fusing similar to Bussman Fusetron FRS Series or equivalent
must be used if the primary circuit is fused. Circuit breakers must provide
protection equivalent to fuses.
Fuse ratings shown in Table 7.C are the highest ratings allowed in a 25
°
C
(77
°
F) ambient temperature. Higher electrical enclosure ambient
temperatures will require fuses with higher current ratings. Consult fuse
manufacturer’s derating data. Fuses larger than those listed below may
result in transformer damage.
Table 7.C
Fuse Current Rating – Amperes
Primary Voltage
208V AC
240V AC
380V AC
415V AC
480V AC
575V AC
1.5
8
7
4.5
4
3.5
3
3.5
17.5
15
9
8
7
6
5.0
20
20
12
12
10
8
10.0
40
35
25
20
17.5
15
12.5
50
45
30
25
25
20
15.0
60
50
35
30
30
25
kVA
External Shunt Regulator Resistor
The external Shunt Regulator Resistor and fuse for the 45A 1391-DES
must be connected to TB5-8 and TB5-9 as described in Chapter 10.
22.5A drives must be converted for use with an external shunt resistor and
fuse. Refer to Chapter 10 and Appendix B for detailed instructions.
Interface Connections
Refer to Chapter 5 and Appendix B for connection information.