Page 68 - M1-12 Ops Manual McMurdo 2016

B.1) LOGIC INPUT
B.2) CURRENT TRANSFORMER INPUT
This instrument can use the input "IN CT/SP- SP2" (connections 14 and 15) as current transformer input or logic input.
This instrument can use the input "IN CT/SP- SP2" (connections 14 and 15) as current transformer input or logic input.
Safety note:
1) Do not run logic input wiring together with
Safety note:
1) Do not run current transformer input wiring
power cables.
2) Use an external dry contact capable of
together with AC power cables.
2) The minimum active period to perform this
switching 0.5 mA, 5 V DC.
3) The instrument needs 100 ms to recognize a
measurement is equal to 400 ms.
3) This feature excludes the logic input function.
4) The input impedance is equal to 10 W.
contact status variation.
4) The logic inputs are NOT isolated by the
measuring input.
5) This feature excludes the current transformer
14 15
input.
14 15
IN CT/SP-SP2
Current transformer
Fig. 7 - LOGIC INPUT WIRING
Fig. 8 - CURRENT TRANSFORMER INPUT WIRING
When the logic input is selected, it is used to switch, by an external contact, from main set point to second set point and viceversa.
This input allows to measure and display the current running in the load driven by the OUTPUT1 during the ON and OFF period of the OUT 1 cycle time. By this feature it is also available the "OUT 1 failure detection" function (see page 20).
1604-1-BC.p65
5
5/16/00, 10:25 AM
logic input open close
op. set point SP SP2
5
Load