Qualitrol 509ITM Series, Manual

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Matrix Controlled
This section of the Output Relay Setup window provides a variety of input signal
configurations and logic to control the relay actuation. For example, using the math function
“or”, you can actuate the relay with a maximum of four different input signals. Conversely, by
using the “or” function and setting the Actuation Direction to “down”, you can actuate on the
minimum signal of the four control signals inputs.
The fields in this section of the Output Relay Setup window are described below.
Control
signal
“X”
(4 fields)
Allows you to select up to four input modules, relay states, and/or fiber
optic probes, the measured values of which, when compared to the
setpoints, actuate or de-actuate the relay according to the logic of the
matrix.
Setpoint
(4 fields) Allows you to select a value corresponding to the control signal, which,
when it equals or exceeds the setpoint value, meets the conditions to
actuate the relay in that column.
Hysteresis
(4 fields) Allows you to select a switching differential required to de-actuate the
relay. Without hysteresis, a relay could toggle on and off rapidly when the
control signal reaches the setpoint value, causing stress on relay circuits.
The hysteresis prevents this by providing a
“dead” band between on and
off.
Example: If there is only one signal controlling the relay and the
Actuation direction field (see below) is set to
“up”, when the control
signal reaches the setpoint value, the relay actuates. The relay de-
actuates only when the control signal falls below the setpoint value minus
the hysteresis.
Actuation
direction
(4 fields)
•
Select “up” to actuate the relay when the input signal becomes greater
than the setpoint value.
•
Select “down” to actuate the relay when the input signal becomes less
than the setpoint value.
Example: You could use the
“up” actuation direction for rising temperature
values and the “down” actuation for alarming on low oil level values.