-48VDC Voltage Monitor
- Input voltage range: -15 to -60 VDC
- Get graphs, see trends of the batteries
- Receive e-mail, pages on alarms
About the size of two dominos, this sensor converts a -48 DC voltage into +5 Vdc signal suitable for the "C123C" I/O ports on a variety of ITW products. Up to three can be attached. If the CCAT interface is used, up to 16 can be attached.
Designed for telephony battery voltage monitoring and other applications requiring monitoring a negative DC voltage, this sensor monitors voltage via the I/O inputs (3) on a WeatherGoose or SuperGoose.
The output is proportional to the input voltage across its normal operating range of -15 to -60Vdc (see graph); by setting appropriate trip points on the Goose’s alarm page, the user can receive an automatic alert to a potentially dead, discharged, or overcharged battery bank based on the battery voltage.
The unit has built-in protection against accidental short circuits and reversed input voltage via internal shunt diodes and a self-resetting polyfuse.
Specifications
Input Range: -15 to -60 Vdc
Output: 0 to 5 Vdc, linear
Accuracy: +/- 5%
Current draw: <20 mA
Cable to battery: 36", 22 AWG solid
Cable to monitor: 36", 22 AWG solid
Attachment: I/O port (C123C)
Enclosure: black plastic box
Dimensions: 3" L x 1.25" H x 0.5" W
Mounting: tie-wrap or Velcro&trade
Connections
WHITE: ground or 0V (positive battery)
YELLOW: -Vin (negative voltage rail, battery)
GREEN: WeatherGoose analog I/O terminal block,"C" terminal (ground)
RED: WeatherGoose analog I/O terminal block, analog input "1", "2", or "3"
Conversion Formula
(-0.72 x Scale Value) = Battery Voltage. Use this formula to convert the sensor output (0 to 100) to actual voltage. For example, a reading of 60 would correspond to approximately a negative 43.2 VDC.
Use this table to translate the output. For example, a -48 volt input to the sensor would be displayed as 66 on the graph. The output is almost linear between 40 and 50 VDC.
Wiring is simple: ring terminals can be used to attach to the battery. Wiring lengths over 100' can be used.