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3 Startup
3.1
Powerup
3.1.1 Safety checks before energizing system
Prior to energizing the system, the installing electrical contractor should verify the following:
1. Proper phase rotation and safe grounding practices have been exercised.
2. All conductor sizing meets or exceeds conductor sizes as detailed in the guidelines of the current
National Electric Code.
3. All building interface points are terminated onto the system's interface board (see Section 3.4.6.3).
4. The TruFit™ system's main input circuit breaker and all subsequent circuit breakers are all in the
"OFF" position.
** DOUBLE CHECK ITEMS 1-4 AFTER THE STEPS ABOVE HAVE BEEN PERFORMED **
3.1.2 Energizing the system
1. The installing electrical contractor should now verify that the input voltage to the unit properly
matches the input voltage rating of the unit as reflected on the system's identification label (affixed
to the inside of the front door of the unit) and as indicated on the transformer label located on the
top of the high isolation transformer positioned in the rear of the unit.
2. Turn the building's circuit breaker feeding the TruFit™ product to the "ON" position. The system's
red Emergency Power Off (EPO) pushbutton should now be illuminated as well as display LCD
screen indicating power is present at the line side of the TruFit™ system main circuit breaker.
3. Energize the TruFit™ product by turning the system's main input circuit breaker to the "ON"
position.
4. Next, the output voltages from the system should be verified. Identify the output voltage of the
transformer by using a true RMS digital volt-meter. If the output voltage of the transformer is not
the desired voltage, access the system's 2 1/2% compensation taps. Compensation tap
configurations are clearly marked on the label affixed to the top of the high isolation transformer
itself. The contractor should re-verify the output voltage to determine that the optimum
compensation tap combination is used to achieve an output voltage as close to your output voltage
as possible.
5. The installing contractor should now verify that the Emergency Power Off (EPO) circuit and the
Remote Emergency Power OFF (REPO) circuit (if applicable) are connected and working properly.
6.
Now that the emergency power off circuit has been verified and input/output voltages are adjusted
properly, energize the system's secondary main circuit breakers (if purchased). Next, sequentially
energize the branch circuit breakers to distribute power to your critical load.
Your TruFit™ system is now distributing power to your connected load. The next sections are dedicated to
assisting you in operating your display/monitoring system. Please take a moment to familiarize yourself
with your TruFit™ product.
Per NEC Article 645.10, an Emergency Power Off button (EPO) is
required. If this option is not installed on the PDU, a remote EPO must
be installed. See Section 3.4.6.3 for location of connection.
Power Distribution Unit│94-1100-00002874 A0 EN 13
TruFit™
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