2-2 Installation
P/N 0013-1027-005 Rev A
Fusing Requirements
Fusing for the IQ-5000 differs from the IQ-2000 in that the IQ-5000 utilizes a separate power
supply. Since the power supply can provide power to up to six drives, the “4 times motor FLA”
rule does not apply.
IQ-2000 Short Circuit Protection
In the United States, the National Electrical Code (NEC) specifies that fuse selection must be
based on the motor full load amperage (FLA), which is not to be confused with the drive input
current. The largest fuse allowed under any circumstances is four times the motor FLA. There-
fore the largest fuses permissible for use are four times the motor FLA (marked on the motor)
converted to an RMS value. The IQ-2000 has been evaluated and listed by Underwriter Labo-
ratories
®
Inc. according to UL 508C, with fuses sized as four times the continuous output current
(FLA) of the drive.
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 fuses should be
used to avoid nuisance trips during power initialization due to inrush current.
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).
Motor Overload Protection
This drive utilizes solid state motor overload protection which operates:
◆ within 8 minutes at 200% overload
◆ within 20 seconds at 600% overload
IQ-5000 Short Circuit Protection
In the United States, the National Electrical Code (NEC) specifies that fuse selection must be
based on the motor full load amperage (FLA), which is not to be confused with the drive input
current. The largest fuse allowed under any circumstances is four times the motor FLA. There-
fore the largest fuses permissible for use are four times the motor FLA (marked on the motor)
converted to an RMS value. The IQ-2000 has been evaluated and listed by Underwriter Labo-
ratories
®
Inc. according to UL508.
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 fuses should be
used to avoid nuisance trips during power initialization due to inrush current.
Short Circuit Current Ratings and Fuse Requirements
Suitable for use on a circuit capable of delivering not more than 5,000 RMS symmetrical
Amperes, 240 Volts maximum, when protected by
◆ PSM 50: class R fuses rated 40A
◆ PSM 125: class R fuses rated 90A
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