Power requirements

Protection: Power inputs are protected against surge, over-voltage, over-current, and reverse power. IEC 61000-4 Class 4 level.

CHG Terminals :

  • Input Voltage: 16 to 32 VDC
  • Input Current Limit at 12 VDC:
    • 1.2 A @ 20 °C maximum
  • Input voltage must be at least 0.3 V higher than the voltage required to charge the battery; 40 VDC sustained voltage limit without damage. Transient voltage suppressor (TVS) diodes at the BAT and CHG terminals clamp transients to 19 to 21 V and 19 to 40 V respectively. Sustained input voltages in excess of 19 V or 40 V respectively can damage the TVS diodes.

BAT Terminals:

  • 10 to 16 VDC
  • 19 VDC sustained voltage limit without damage; transient voltage protected
  • 2.5 A max current at 12 VDC at 20° C; trickle charges the battery

External Batteries:

  • Float charge on BAT terminal
  • 12 VDC
  • Valve-regulated, lead-acid (VRLA)
  • 2 to 24 Ah battery typical

Vehicle Power Connection: When primary power is pulled from the vehicle power system, a second power supply OR charge regulator may be required to overcome the voltage drop at vehicle start-up.

USB Power: Functions that will be active with USB 5 VDC include sending programs, adjusting data logger settings, and making some measurements. If USB is the only power source, then the CS I/O port and the 12V and SW12 terminals will not be operational. When powered by USB (no other power supplies connected) Status table field Battery = 0.

Internal Lithium Battery: AA, 2.4 Ah, 3.6 VDC (Tadiran TL 5903/S) for battery-backed SRAM and clock. 3-year life with no external power source. See also Internal battery.

Average Current Drain:

Assumes 12 VDC on BAT terminals — add 2 mA if using CHG terminals.

  • Idle: <1 mA
  • Active 1 Hz Scan: 3 mA
  • Active 20 Hz Scan: 67 mA
  • Serial (RS-232/RS-485): Active + 25 mA
  • Ethernet Power Requirements:
    • Ethernet 1 Minute: Active + 1 mA
    • Ethernet Idle: Active + 4 mA
    • Ethernet Link: Active + 47 mA

Wi-Fi Additional Current Contribution at 12 VDC:

Mode

Wi-Fi Option
Client Mode 7 mA idle, 70 mA communicating
Access Point Mode 62 mA idle, 70 mA communicating
Sleep (use IPNetPower() or DevConfig setting to disable) <1 mA

RF Average Additional Current Contribution at 12 VDC:

  ‑RF407, ‑RF412, ‑RF427 ‑RF422 ‑RF451/RF452
Transmit < 80 mA 20 mA 650 mA, maximum
Idle On 12 mA 9.5 mA 15 mA, maximum
Idle 0.5 s Power Mode 4 mA 3.5 mA NA
Idle 1 s Power Mode 3 mA 2 mA NA
Idle 4 s Power Mode 1.5 mA 1.5 mA NA