Matters Needing Attention In Electrical System; Fuse; Leakage Current; Mechanical Installation - Servotronix CDHD2S User Manual

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4.7 Matters Needing Attention in Electrical System

4.7.1 Fuse

Circuit protection shall comply with the National Electrical Code and/or regulations set forth
by national, state, provincial and/or local authorities.
US fuse: RK5, CC, J or class T, AC 600V200kA, time delay. It must be UL and CSA certified;
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UR recognition alone is not enough.
EU fuse: type gRL or gL, 400V/500V, time delay.
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Fuse holder: Standard fuse holder, or finger-safe fuse holder that meets IEC60529. For
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example:
Bussmann: CH series modular fuse holders, fuse size less than 30A, class J, 3-pole:
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CH30J3.
Ferraz: Ultrasonic fuse, fuse size less than 30A, class J, 3-pole: US3J3I.
◼

4.7.2 Leakage current

PE conductor leakage current comes from a combination of equipment and cable leakage
current. The leakage current frequency pattern includes multiple frequencies from which the
residual current circuit breaker is estimated as 50Hz. Therefore, leakage current cannot be measured
with a traditional multimeter.
According to experience, based on the PWM frequency of the output stage, the following
assumptions can be made about the leakage current on the cable:
Ileak=nx20mA+Lx1mA/m, output stage 8kHzPWM frequency
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Ileak=nx20mA+Lx2mA/m, output stage 16kHzPWM frequency
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(where Ileak=leakage current, n=number of drives, L=motor cable length)
Since the leakage current of PE is greater than 3.5mA, it meets the requirements of doubling
PE connection or using connecting cables with cross-sectional area greater than 10mm² as
stipulated in IEC61800-5-1 standard. This requirement is met using PE terminals and PE connecting
screws.

4.8 Mechanical Installation

4.8.1 Installation of CDHD2S

Mount the CDHD2S on a grounded conductive metal panel using the bracket on the back of
the CDHD2S. The metal panel must be strong enough. For installation dimensions, please refer to
the Dimensions.
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