YSI 5500D-1 - Manual (Page 70)

YSI 5X00
139
YSI 5X00
138
- One relay can be assigned to multiple systems. It is essential that the relay
configuration be verified in order to avoid conflict of operation of wired relay
devices. Assigning one relay to multiple systems can result in invalid operation.
Control Mode and Alarms
Menus → Sensor Setup → Aux 1-6 →Control Mode
→ DO 1-4 →Control Mode
Configure DO, Aux analog and Aux temperature systems to control and alarm at
user configured values to best manage your aquatic system. Sensors and aux analog
devices report values to the 5X00. Wire and configure peripheral devices (outputs) to
turn on and off in order to maintain certain water conditions as close to the setpoint
as possible. 5X00 instruments have two control modes. They are Set Point control
and PID/PWM control. In both control modes a set point is configured. Configure
the set point to the ideal system value.
When a system is operating in Set point control mode control relays energize when
a user configured control value is reported to the 5X00 from the input sensor or
device. The control relay remains energized until the the system set point value
is processed by the 5X00.* In contrast, when a system is operating in PID/PWM
control mode there are no user configured control values. Control relays energize
anytime a value is reported that is away from the set point. (See PID/PWM up/down
control configuration -page 144). The control output relay on time is proportional
to certain conditions and values being reported to the 5X00.
Set point and PID/PWM control are discussed in more detail in following sections.
See Setpoint control beginning on page 139 and PID/PWM control beginning on
page 143.
*exception - high temperature may also be configured for a timed set point mode
- see page 151.
Notes:
- Aux digital systems do not have set point or PID/PWM control modes. See
page page 147 for complete aux digital configuration information.
- Sensor Setup menu selections change based on the configured control mode.
- Changing control method between PID/PWM and Set Point may result in
invalid set point, control and alarm value configurations. Always reconfirm
control menus configuration when control mode is changed.
Set Point Control
Set point control menu options are shown below for an aux analog system.
Control relays configured in the Set Point control mode energize when a user
configured control value is received from the input device and is processed by the
5X00. Control relays can be configured to raise and/or lower DO, temperature, and
analog aux device systems. High temperature control may also be configured for
a timed set point mode - see page 151. Configure high and/or low alarm systems
to activate peripheral devices and/or to provide alarm notification messages when
alarm condition(s) exist. Configure values outside of acceptable operating control
range as high and low alarm values.
Set Point Control Values
Range low and Range high values set the acceptable operating range for the water
system. Control system(s) do not become active when value(s) are within accept-
able control range. See figure 4.8 - page 140. Enabled control relays energize when
the sensor reports a value ≤ the range low control value or ≥ range high control
value. Control relays are typically wired to devices used to raise or lower certain
water parameters in order to maintain the system as close to set point as possible.
Control relays remain energized until the sensor reports a value ≤ set point (when
dosing down to lower specific water parameter) and/or ≥ set point (when dosing
up to raise specific water parameter). Exception - temperature high timed set point
control - page 151. Sensor low control range starts at -1 significant digit below set
point value. High control range starts at +1 significant digit above set point value.
Figure 4.8 shows how the 5X00 operates based on a set point control sensor setup
configuration. In the example provided DO range low and range low 2 devices will
energize at ≤ 5.0 and ≤4.0 respectively. The alarm low system becomes active at ≤3.5.
Configuring the 5X00 Configuring the 5X00