Spirit II User’s Manual
Section 3: Installation
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3-9
Power Supply Primary Power Connections
** Before connecting primary power, check the data plate
on the power supply to verify the voltage required **
A primary disconnect switch, switching all ungrounded supply conductors, should be
provided for each Spirit system. The disconnect switch should be located as close as
possible to the power supply so it can be turned off quickly in case of an emergency.
The disconnect switch must be equipped with time delay fuses only.
The magnetic
inrush current of the power supply can be up to 30 times the steady state load current
for 0.01 seconds and up to 12 times for 0.1 sec. With non-delay fuses, the fuse will
clear due to the inrush current. The same applies for circuit breakers which have an
instantaneous magnetic trip. Use of a motor-start circuit breaker or equivalent is
recommended if time delay fuses are not used or allowed by local or national codes.
The main feed device (breaker or fuse) and any branch protection (breaker or
fuse) upstream of the power supply must be sized to handle all branch loads for
both steady state and inrush current.
The disconnect switch should be sized according to local and national codes. The
rating must meet or exceed the continuous rating of the fuses used. See the following
chart for recommended fuse sizes:
3 Phase
Input Voltage (VAC)
Input Current
at Maximum
Output (amps)
Recommended
Time-Delay Fuse
Size (amps)
380 VAC, 50/60Hz
152
200
400 VAC, 50/60Hz
144
175
415 VAC, 50/60Hz
140
175
440 VAC, 50/60Hz
131
175
480 VAC, 60Hz
120
150
600 VAC, 60Hz
96
125
Connection to the supply circuit can be by means of flexible supply cables or supply
cables through conduit to a permanent installation. The supply cables should have a
600 volt minimum rating and should be sized according to local and national codes.
Route flexible supply cables through the strain relief on the back of the power supply
and connect to the input terminal block TB5 as shown. For supply cables through
conduit, install the conduit in place of the strain relief and connect the associated supply
cables to the input terminal block TB5. See Figure 3 on the next page.
