Nortek Vector Comprehensive Manual

Also see for Vector: Quick start guide

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Nortek Vector Comprehensive Manual Manual pdf 91 page image

Integrators Guide - Light 91© 2018 Nortek AS4.1 Analog Inputs (Vector)There is an option to connect external sensors to the two analog inputs. The external sensors maybe powered by the Vector (enable this in the Deployment Planning dialog), and their data output maybe stored in the instrument during a deployment or downloaded in real time. With two externalsensors connected, the Vector is able to read both analog inputs at the same time.The reported analog value from the Nortek instrument is counts. The scaling is V = (Counts/65536)*5due to 16 bit AD converter. The input range is 0-5 Volt, where 0 Volt equals 0 counts, 5 Volts equals65535 counts and 2.5 Volts equals 32768 counts.The analog input can be scaled and re-labeled in the instrument specific software; Click View >Analog Inputs.To configure the Vector for use with external sensor:In the instrument software click Deployment > Planning > Use existing or use Load fromInstrument.Check the “Use Advanced Settings” box and go to the Advanced tab.Define which analog input (1, 2 or both) to use.There is a choice between fast and slow sampling. When choosing slow, the sampling is doneonce a second together with the other non-velocity sensors. If fast is chosen, the analog sensor issampled together with the velocities at for instance 8 Hz. Only one Slow input is permitted.If you want to power the external sensor from the instrument you must check the Output powerbox.The output power is configured in hardware by Nortek and can be raw (i.e. battery power), +5 V,or +12 V (see table below). The raw setting is the default setting and all instruments come with thissetting unless otherwise was specified upon ordering.Power out can be software selected by sending a HEX command in a terminal emulator.Voltage Level Command Maximum CurrentRAW OPWRBA 500 mA+12 V OPWR12 100 mA+5 V OPWR5V 250 mABe aware that the power out is turned off when the instrument is in sleep mode, as this contributesto reducing the system’s power consumption significantly. Consequently, the external sensor usedmust be capable of automatically resuming its duties once the power comes back and it must dothis within 1 sec after power up in order to provide correct data for the first sample. Also note that:Power at 5 and 12 VDC comes through switching regulators. This means that power drawn fromthe battery pack is 15-18% greater than the power consumed by the external device. See examplebelow when considering energy consumption.The output voltage is protected against short-circuit with a 1-amp fuse. To protect the Vectorcircuitry against external sensors providing an output voltage in excess of +5.0V, there is aclamping diode on the input with a current limiting resistor in series. The diode will conduct atvoltages above approximately 5.3V. To achieve stable conditions during testing, the +5V_SEN netcan be powered up from command mode by sending the hex command 435001C4.The output voltage turns on at least 0.8 s before the beginning of a measurement interval, and itturns off again at the end. The first measurement of the analog inputs occurs roughly 0.9 s afterpower is applied.The planning software does not consider power consumption of your external devices when it plans