Rockwell Automation 839E Solid-State Flow Sensors - Manual (Page 26)

839E Solid-State Flow Sensors User Manual
24 Pub #10000004735 Ver 03, May 2012
Technical data
Power supply
Supply voltage
• DC voltage version
18...30 V DC
Current consumption
• < 100 mA (open-circuit operation) at 24 V DC, max. 150 mA (open-circuit operation); with
reverse polarity protection
Power supply failure
• Behavior in case of overvoltage (> 30V)
The device works continuously up to 34V DC without any damage. No damage is caused to
the device in case of a short-term overvoltage up to 1 kV (as per EN 61000-4-5). If the supply
voltage is exceeded, the properties specified are no longer guaranteed.
• Behavior in case of undervoltage
If the supply voltage drops below the minimum value, the device switches off (status as if
not supplied with power = switch open).
Output
Switching capacity
• Switch status ON: Ia ≤ 250 mA
• Switch status OFF: Ia ≤ 1 mA
• Switching cycles: ≤ 10,000,000
• Voltage drop PNP: ≤ 2 V
• Overload protection
Automatic load testing of switching current; output is switched off in case of overcurrent,
the switching current is tested again every 0.5 sec.; max. capacitance load: 14 mF for max.
supply voltage (without resistive load); periodical protective disconnection in event of
overcurrent (f = 2 Hz) and ‘Warning’ display.
Signal on alarm
• Switch outputs: in safe state (switch normally open)