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Chapter 10
Transformers and Shunt Regulators
10-6
ATTENTION: Proper derating must be applied to the
!
manufacturers nominal resistor power ratings when using these
in external shunt configurations. Consult the resistor
manufacturer for recommended derating. Failure to comply
could result in personal injury and/or equipment damage from
an overheated resistor.
Shunt Fusing
Shunt regulator fusing is provided with all of the 1391-DES drives. The
fuse is in series with the resistor and used to protect the resistor against
short circuits. The shunt fuse is located on top of the drive near the circuit
breaker for 15 and 22.5A drives. External resistors for 22.5A and 45A
drives are supplied with a fuse which must be mounted external to the
drive (see Appendix A for mounting dimensions). Refer to Table 10.C for
further shunt fuse information.
Table 10.C
Shunt Fuse Information
Drive Rating
Fuse Location
15A
Top Panel
22.5A
Top Panel
22.5A
External
45A
External
Important: Repeated overvoltage tripping can be an indication that the
shunt fuse has malfunctioned.
Fuse Type
Bussmann KLM-10 or equivalent
Bussmann FNM-6.25 or equivalent
Bussmann KTK-15 or equivalent
Bussmann KLM-20 or equivalent
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