Fairbanks X SERIES PR 5410 Process Indicator - Manual (Page 23)

Section 3: Installing the Instrument and Plug-In Cards
10/08 23 51207 Revision 1
3.3.4 Optocoupler Outputs
The main board has 3 digital outputs for process control, electrically isolated by optocouplers, each
bipolar potential-free.
Number of outputs: 3 ( CH1, CH2, CH3 )
Output: Max. switching voltage: 31 VDC,
Protected against incorrect polarity
Max. switching current: 25 mA
Voltage drop @ 25 mA: 3 V
Passive, external supply required
Electrical isolation: Yes, via optocouplers
Connection:
Plug-in 7-pin terminal block, cable
shield connected to housing
(terminal 7), max 1.5 mm² cable
Cable: Shielded, max. 50 m
Example: connection of relay control
The relay switches, when the
output is active (true). For
protection of the output circuit,
relays with free-wheel diode must
be provided.
Example: connection of voltage output
When the output is active (true),
the output voltage goes from 24 V /
12 V to < 3 V . The load resistance
must be 2.2 kohms / 1 kohm.