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Motor Overload Protection
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
Model 620 Type 4 Series
UL Listed (JDDZ) non-renewable cartridge fuses or UL Listed (JDRX) renewable cartridge fuses, rated 300Vac
or 600Vac as appropriate (depending on the rated input voltage of the drive), must be installed upstream of the
drive. For fuse current ratings, see Chapter 1 “Electrical Ratings - Power Circuit”.
Model 620 Type 5 and 6 Series
UL Recognized Component (JFHR2) semiconductor fuses must be installed upstream of the drive. For fuse
current ratings, see Chapter 1 “Electrical Ratings - Power Circuit”. Refer to Table 1-16 below for recommended
semiconductor fuse manufacturer and model numbers.
Fuse Current Rating
Bussmann Model No.
40A
50A
63A
100A
125A
170M3808
170M3809
170M3810
170M3812
170M3813
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Model 620 Type 7 Series
These devices are provided with solid state short circuit (output) protection. Branch circuit protection should be
provided as specified in the National Electrical Code, NEC/NFPA-70.
Short Circuit Ratings
Model 620 Type 4, 5, 6 Series.
Suitable for use on a circuit capable of delivering not more than 5000 RMS Symmetrical Amperes, 240/460V
maximum.
Model 620 Type 7 Series.
Suitable for use on a circuit capable of delivering not more than (the value shown in Table 1- 17) RMS
Symmetrical Amperes, (the value of rated voltage shown in Table 1- 17)V maximum.
Output Rating - kW
Rated Voltage - V
Short Circuit Rating RMS Symmetrical Amperes
22 - 37
45 - 75
208 - 240
380 - 460
5,000
10,000
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Field Wiring Temperature Rating
Model 620 Type 4, 5, 6 Series - Use 60
o
C copper conductors only.
Model 620 Type 7 Series - Use 75
o
C copper conductors only.
Motor Base Frequency
The motor base frequency rating is 240Hz maximum.
Operating Ambient Temperature
For operating ambient temperature range, see “Electrical Ratings - Power Circuit” on page 1-4
Environmental Rating
Model 620 Type 4, 5, 6, 7 Series with a Product Code Block IV designation xx2x are suitable for direct wall-
mounting as they have a “Type 1 Enclosure” rating.
This manual was downloaded on www.sdsdrives.com
+44 (0)117 938 1800 - [email protected]