onset
®
POWER MONITORING
INSTALLATION GUIDE
14724-D
PAGE 6
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Onset, HOBO, HOBOware, and HOBOlink are trademarks or registered trademarks of Onset Computer Corporation.
CONTROL POWER
Direct Connect Control Power
Line to Line (L-L)
Direct Connect Control Power
Line to Neutral (L-N)
Line to Line from 90VAC to 600VAC (UL) (520VAC for CE). In UL
installations, the lines may be floating (such as a delta). If any lines are
tied to an earth (such as a corner grounded delta), see the Line to Neutral
installation limits. In CE compliant installations, the lines must be neutral
(earth) referenced at less than 300VAC
L-N
Line to Neutral from 90VAC to 347 VAC (UL) or 300VAC (CE)
Direct Connect Control Power DC
Control PowerTransformers (CPT) Connection
DC Control Power from 125VDC to 300VDC (UL and CE max.)
The Control Power Transformer may be wired L-N or L-L. Output to
meet meter input requirements.
Fuse Recommendations:
Keep the fuses close to the power source (obey local and national code requirements).
For selecting fuses and circuit breakers, use the following criteria:
•
Current interrupt capacity should be selected based on the installation category and fault current capability.
•
Over-current protection should be selected with a time delay.
•
The voltage rating should be sufficient for the input voltage applied.
•
Provide overcurrent protection and disconnecting means to protect the wiring. For DC installations, the installer must provide external circuit
protection (suggested: 0.5 A time delay fuses).
The earth connection is required for electromagnetic compatibility (EMC) and is not a protective earth ground.
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