Hurco VMX64 - Service Fusing Calculation Guide

1 - 6 Site Preparation Pre-Installation Manual for i-Series Machines v387
Calculating Service Fusing
 Ensure adequate service fusing is available.
First, determine your incoming AC Voltage, 3 Phase service. Use the Service KVA
Requirements to calculate the service fusing for your machine.
For 3-phase power, the equation is .
For example, to calculate the fuse current where incoming service KVA ( ) is 50 KVA
and Input Voltage (
Ε) is 400 VAC:
See the Model-specific Specifications document for Incoming Voltage
and Full Load KVA.
P
3Φ
I
3xE
--------------
=
Ρ Φ3
I
P
3Φ
E 3×
-----------------
50 000VA,
400Vx1.732
-----------------------------
==
I
50 000VA,
693V
------------------------- -
73A==