User manual

Operation
67 Liebert
®
iCOM
®
S199 Operation @ Sensor Failure—This parameter determines what action to take if the static
pressure sensor fails (non-teamwork). There are two options to use when handling a static pressure
sensor failure, they are SP OFF = static pressure control Off, where the control will use S146 to
control the fan when the sensor is lost or Freeze Speed = keep the fanspeed unchanged based on the
last reading to iCOM. Things that need to override fanspeed such as freeze protection can still change
the fanspeed.
S19A SP Upper Range—The control calculates the Upper Range by using S191 “SP Setpoint” and
S192 “SP Deadband,” the results on lines show both values, in WC and Pa.
S19B SP Lower Range—The control calculates the Lower Range by using S191 “SP Setpoint” and
S192 “SP Deadband,” the results on lines show both values, in WC and Pa.
3.10 Event Types and Properties
Liebert iCOM events are used to inform the user of cooling unit operational status. All events are
recorded in the Event Log, which is in the User Menu. The user can change the type (alarm, warn,
message) and time delay of some events and can also enable or disable some events. These event
settings are in the Service Menu under Set Alarms, pages 3 to 7. If an event has a safety function
(high pressure, low pressure, main fan overload, etc.), the safety function will be executed in any case,
independent of the selected event type or if enabled or disabled. The timing will function as set.
Event Types
• Message: If this event occurs, it will only be entered into the event log.
• Warning: If this event occurs, a warning will be generated and entered into the event log. The
common alarm relay will be activated only if parameter Warning Activates Alarm Relay located
in the Service menu under Alarm Setup is set to Yes. The factory default setting is Yes.
• Alarm: When an alarm is received, a red light on the Liebert iCOM will blink and an alarm will
sound, unless turned Off in the User Display Setup Menu. Pressing the alarm button will
acknowledge the alarm but not clear the alarm. The alarm will not be cleared until the issue has
been corrected, reset internally by the control or reset manually by the user. For instance, alarms
such as High Pressure can be cleared by changing the alarm counter back to 0. If this event
occurs, an alarm will be generated and entered into the event log. An alarm does not necessarily
switch Off the whole cooling unit; it depends on which alarm occurs. If a standby unit is set, any
alarm will stop the faulty unit and start the standby unit. Standby activation functions only on
alarms; messages or warnings will not start a standby unit. For more on standby units, see 4.0 -
Teamwork.
Time Delay
Delays the event reaction once it is triggered. The time delay applies to safety functions and is
entered in seconds.
Enable or Disable
Disabled events do not show up in the event log, on the display or on monitoring devices. Also, the
common alarm relay will not be activated if a disabled alarm occurs. Safety functions, such as lockout
compressor in case of high pressure are still performed.
NOTE
Not all critical event properties can be adjusted.
NOTE
Once an event, either Warn or Alarm type, has been set to Disable, the associated alarm
condition will not be annunciated. Disabled events may be reset only through the menu item
Reset Disabled Alarms.
NOTE
The value of the external delay includes the internal delay if it is greater than the internal
delay.
The minimum setting of the external delay is the value of the internal delay. This is valid only
for values marked with *.