Gf-signet 8900 Multi-Parameter Controller Bedienungsanleitung Seite 31

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31 Signet 8900 Multi-Parameter
11. Relay Mode Descriptions
The 8900 offers a wide selection of relay operating modes that enable the user to create complex control scenarios.
Internal relays (those installed on the two Relay modules) can be con gured for all of the available modes.
External relays that are located in the 8059 External Relay module are limited to the basic relay modes as shown in the chart.
Maximum Proportional Pulse rate: 400 pulses per minute
Internal Relays
External Relays
Mode:
Off Low High Window USP Advanced Prop. Pulse PWM Vol. Pulse
Source:
Measurements
Flow
XXX X X X X
pH
XXX X X X
ORP (Redox)
XXX X X X
Conductivity
XXX X X X X
Pressure
XXX X
Temperature
XXX X X X
Level
XXX X X X
Derived Functions
Sum
XXX X X X
Difference
XXX X X X
Ratio
XXX X X X
% Reject
XXX X X X
% Passage
XXX X X X
% Recovery A
XXX X X X
% Recovery B
XXX X
% Recovery C
XXX X
Power 2
XXX X
Power 4
XXX X
Multiple
XXX X X
Hysteresis
ime
Low Setpoint
Process
Hysteresis
ime
High Setpoint
Process
High Limit
Hysteresis
Hysteresis
Window
ime
Low Limit
Process
Low
Relay is activated when the process variable is less than the setpoint.
The relay is deactivated when the process variable becomes greater than the sum of
the setpoint and the hysteresis.
High
Relay is activated when process variable is greater than the setpoint.
The relay is deactivated when the process variable becomes less than the sum of
the setpoint and the hysteresis.
Window
In Window mode, a single relay is activated when the process variable moves above
or below a xed window of values.
The relay is deactivated when the process variable moves inside the window by
more than the hysteresis value.
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