Omega Engineering CN3271 Series User Manual page 8

B) Logic Input (for models with RS-485 only) B) Logic Input (for models with RS-485 only) B) Logic Input (for models with RS-485 only) B) Logic Input (for models with RS-485 only) B) Logic Input (for models with RS-485 only)
This input is used for remote acknowledgement
(reset).
Safety note:
- Do not run logic input wiring with AC power
cables.
- Use an external dry contact capable of
switching 0.5 mA, 5 Vdc.
- The instrument needs 100 ms to recognize a
contact status variation.
- The logic inputs are NOT NOT isolated from the NOT NOT
NOT
measuring input.
Logic input
14
15
Fig.7
LHL-1-NEUTRO.pmd 5
C.1) Relay Outputs C.1) Relay Outputs C.1) Relay Outputs C.1) Relay Outputs C.1) Relay Outputs
NO - OUT 1
OUT 1
1
C - OUT 1
2
Class 1
NC - OUT 1
3
C
OUT 2
6
Class 1
(Alarm)
NO
7
Fig. 8
The OUT 1 contact rating is 3A/250V AC on
resistive load.
The OUT 2 contact rating is 2A/250V AC on
resistive load.
The number of operations is 1 x 10 5 at specified
rating.
NOTES 1) To avoid electric shock, connect power NOTES NOTES NOTES NOTES
line at the end of the wiring procedure.
2) For power connections use No 16 AWG
or larger wires rated for at last 75 °C.
3) Use cupper conductors only.
4) Don't run input wires with power cables.
All relay contacts are protected by varistor against
inductive load with inductive component up to 0.5 A.
The following recommendations avoid serious
problems which may occur, when relay outputs
are used with inductive loads.
5
19/04/2004, 15.07