12-6 Certification for the Converter
590 Series DC Digital Converter
Requirements for UL Compliance
Motor Overload Protection
Note: An external motor overload protective device must be provided by the installer.
Motor overload protection is provided in the controller by means of the thermal device in the
motor winding. This protection cannot be evaluated by UL, hence it is the responsibility of the
installer and/or the local inspector to determine whether the overload protection is in compliance
with the National Electrical Code or Local Code requirements.
Branch Circuit/Short Circuit Protection Requirements
UL Recognized Component (JFHR2) semiconductor fuses with current ratings and maximum
I
2
t ratings as specified below must be installed upstream of the controller. Refer to the table
below for the recommended fuse manufacturer and part number.
Controller Rating Semiconductor Fuses
Ratings Part No. Littelfuse
(HP) (A) (V) (A) I
2
t (A
2
s) (or equivalent*)
20 35 500Vac 40 1,000 L50S 40
40 70 500Vac 80 5,000 L50S 80
60 110 500Vac 125 10,000 L50S 125
80 150 500Vac 175 20,000 L50S 175
100 180 500Vac 175 20,000 L50S 175
150 270 500Vac 300 60,000 L50S 300
200 360 500Vac 400 110,000 L50S 400
250 450 500Vac 500 175,000 L50S 500
400 720 500Vac 800 450,000 L50S 800
* Other UL Recognized Component (JFHR2) semiconductor fuses may be installed
upstream of the controller provided that the voltage, ampere and I
2
t ratings shown
above are not exceeded.
Note: Semiconductor fuses are acceptable as branch circuit short-circuit protection for
the solid-state motor controllers only.
Table 0-1 Branch Circuit/Short Circuit Protection Requirements
Short Circuit Ratings
These products are suitable for use on a circuit capable of delivering not more than (the value
shown in Table 0-2) RMS Symmetrical Amperes, 500V maximum.
Output Ratings Short Circuit Rating
A kW Hp RMS Symmetrical Amperes
35 15 20 5,000
70 30 40 5,000
110 45 60 10,000
150 60 80 10,000
180 75 100 10,000
270 110 150 10,000
360 150 200 18,000
450 190 250 18,000
720 300 400 30,000
Table 0-2 Short Circuit Ratings
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