Knowledge Base

Trimble NetR5, NetR8 and NetR9 - Critical Power-On/Off Configuration Details

NetR5, NetR8, and NetR9 hardware requires that Power On and Shutdown Voltages be properly configured to ensure proper functionality when used with DC power systems. 

UNAVCO has determined, and Trimble has confirmed, that a NetR5, NetR8, or NetR9  configured with a Power On Voltage that is not more than 1 Volt greater than the Shutdown Voltage will not power on as programmed under certain circumstances.  UNAVCO suggests that a minimum separation of 1.3 Volts be used.

These settings are found in the "General" submenu of the "Receiver Configuration" menu of the web interface.  UNAVCO recommends the following configurations, depending on the type of Charge Controller being used:

1.  If a Charge Controller without a Low Voltage Disconnect (LVD) is used:
Power On Voltage: 12.50V
Shutdown Voltage: 11.00V

2.  If a Charge Controller WITH an LVD is used:  identify the voltage thresholds of the LVD and set the receivers voltages below each of them.  A commonly used controller - the Flexcharge NC30 - will disconnect the load when battery voltage drops below 10.9V and reconnect at 12.9V.  The NetR9 should then be set to:
Power On Voltage: 12.80V
Shutdown Voltage: 10.80V

Users should consider the effects of these settings on their power systems and may adjust them according to need, but should be careful to adhere to the minimum separations.  Please contact UNAVCO for advice and assistance testing individual configurations, and for further details.

While future versions of firmware may add enhancements to the user interface that will explicitly warn users of the configuration requirements and change the defaults accordingly, this is a hardware-based feature and will always be present in these receivers.

Attached Files
There are no attachments for this article.
There are no comments for this article. Be the first to post a comment.
Security Code Security Code
Related Articles RSS Feed
Trimble Warranty Code Requests
Viewed 13385 times since Tue, Aug 27, 2013
Trimble NetR9 Receiver - GSOF Messages
Viewed 2646 times since Thu, May 15, 2014
Trimble NetR5, NetR8, and NetR9 Receivers: Hint for Using Web Interface With Slow Connection
Viewed 3282 times since Fri, Apr 29, 2011
How to build a NetR8 or NetR9 DC power cable
Viewed 1711 times since Wed, Jan 4, 2012
Trimble NetR9 - How to login when the login prompt missing
Viewed 2970 times since Thu, Mar 13, 2014
Trimble NetR5 Resource Page
Viewed 6763 times since Tue, Jun 1, 2010
HTTPS: Firefox workaround for Trimble receivers
Viewed 2230 times since Wed, Jan 25, 2012
Trimble NetR9 - How to enable an external frequency source
Viewed 6929 times since Thu, Feb 27, 2014
Accessing the NetRS/NetR8/NetR9 programmatic interface with linux curl command
Viewed 19800 times since Thu, Apr 5, 2012
Hardware Limitation of Trimble NetR5 and NetR8 GNSS Receivers
Viewed 18547 times since Fri, Feb 15, 2013

Last modified: Monday, 12-May-2014 00:18:29 UTC