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Device Functions Proline Promag 55
7 Block OUTPUTS
Hauser
101
7.3.4
Switching response of the relay output
General
If you have configured the relay output signal for "LIMIT VALUE" or "FLOW DIRECTION", you can
define the requisite switch points in the ON-VALUE and OFF-VALUE functions. When the
measured variable in question reaches one of these predefined values, the relay output switches as
shown in the illustrations below.
Relay output configured for "limit value"
The relay output signal switches as soon as the measured variable undershoots or overshoots a
defined switch point.
Application: Monitoring flow or process-related boundary conditions.
Measured variable
A0001235
A = Maximum safety
→
m
SWITCH-OFF POINT >
n
SWITCH-ON POINT
B = Minimum safety
→
m
SWITCH-OFF POINT <
n
SWITCH-ON POINT
C = Minimum safety
→
m
SWITCH-OFF POINT =
n
SWITCH-ON POINT (this configuration is to avoid)
o
= Relay de-energized
Relay output configured for "flow direction"
The value you entered in the ON-VALUE function defines the switch point for the positive and
negative directions of flow.
If, for example, the switch point you define is = 1 m
3
/h, the relay drops out at –1 m
3
/h and pulls
up at +1 m
3
/h. Set the switch point to 0 if your process calls for direct switchover (no switching
hysteresis). If low flow cutoff is used, it is advisable to set hysteresis to a value higher than or equal
to the low flow cutoff rate.
Switch-off point / Switch-on point
A0001236
a = Relay energized
b = Relay de-energized
t
o
o
n
n
m
o
n
m
A
B
C
m
-1
0
+1
a
b
-Q
Q
Содержание Proline Promag 55
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