YSI 5500D-1 - Manual (Page 74)

YSI 5X00
147
YSI 5X00
146
PID/PWM Alarm System
Alarm values set the acceptable control range. Enable and configure system(s) alarm
to activate alarm output devices(s), view alarm icons, hear audible alarm and/or
receive alarm notifications sent via email or cell phone (SMS) - page 91. Config-
ure high and low alarm values to set alarm thresholds. Alarm system(s) becomes
active when value is ≤ low alarm value or ≥ high alarm value. Enabled alarm relays
energize if alarm condition exists for the general alarm hold off time. Alarm relays
are energized until one of the four softkeys
is pressed
regardless of sensor value. Pressing one of four softkeys resets the alarm system.
Alarm systems become active again if, after the alarm hold off period, the alarm
condition still exists. Alarm hold off is configured in the General Alarm menu.
When the General Alarm is enabled, (with or without enabled relay), the general
alarm system becomes active when any system alarm is active. See General Alarm
- page 124.
Notes:
- It is important to keep the 5X00 at the Run Screen during normal opera-
tion. Alarm functionality (email alarms, activation of enabled alarm relays,
alarm icons, and buzzer) is suspended when 5X00 is not at Run Screen.
- Alarm icon(s) display at the Run Screen when alarm condition(s) exists for
longer than the general alarm hold off time. See Icons - page 78.
- Press at Run Screen to display active sensor and aux system relays.
- to display events created by control and alarm relays - see Event Log
- page 112.
- Alarm relays are not energized if the 5X00 DO sensor value reads “Over” or
“Under.”
- “Over” and “Under” are not displayed for aux temperature systems when
temperature values are outside the temperature range specification - see tem-
perature range specification - page 15. Temperature system alarms will not
operate correctly when values are outside the temperature range specification.
- See Wire Relays - page 56 for information on wiring alarm output devices.
30 Second Aux and Sensor System Hold Off
Exiting aux and sensor menus after making certain configuration changes places the
system in a 30 second hold. During the 30 second sensor hold, control and alarm
systems are not active. System(s) becomes active, if, after 30 seconds, the values
are reported in control or alarm range. This 30 second hold off allows sensors and
aux devices time to stabilize before control and/or alarm systems become active.
Example - DO sensor menu is entered and the control high set point value is changed
while a control relay is energized. When
is pressed to return to the Run
Screen, the DO control relay de-energizes regardless of sensor value. The control
relay re-energizes if, after the 30 second hold, the value is still in control range.
Reconfiguration of the following does not place the system in 30 second hold off:
- DO systems - display format, probe type, membrane type, ppt, elevation, temp
source, and temp display format;
- Temperature system - display format, chiller on time, chiller on time units,
chiller hold off time, chiller hold off time units , set points, enable/disable
control relays.
Notes:
- Configuration changes place only the system that has been reconfigured on
30 second hold.
- No “off” event log is created when energized system relays de-energize due
to 30 second sensor hold off.
- Control icons and control messages continue to display during the 30 second
sensor system hold at the Run Screen regardless if relays are energized.
Aux Hold Off (non temperature aux systems)
Aux Hold Off (user configured) is the length of time the control or alarm condition
must exist before the Aux relay energizes.
Notes:
- To avoid control or alarm for spurious events , configure the Alarm Hold Off
> than 0.
- If General Alarm is enabled, it is triggered after the Aux hold off time and not
the general alarm hold off time.
Aux Digital
Configure digital control/alarm (open/closed), relay, alarms, and hold off in the Aux
1 - Aux 6 Sensor Setup Menu. Use digital input type for control, or alarm, based on
either a switch open or switch closed condition. Only one relay can be configured in
an aux digital system. Enabled relay will energize based on the condition configured
in the control/alarm on menu.
Configuring the 5X00 Configuring the 5X00