User manual

Operation

3.8.2 Software Setup

To prepare the Liebert iCOM for Liebert Smart Aisle Control:

1. Set Service Menu parameter S146 (VSD fan speed) to Auto. This sets the cold aisle sensor to

control the fan speed.

The cold aisle temperature setpoint can be set on parameter S102 (Temperature Setpoint).

2. Set Service Menu parameter S124 (supply sensor) to Cooling Only. This sets the supply sensor to

control the chilled water valve.

The discharge temperature setpoint can be set on parameter Service Menu S125 (Supply

Setpoint).

3.9 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

general alarm relay will be activated only if parameter Warning Activates Alarm Relay located in

the Service menu under Alarm Setup is set to Yes (Yes is the default setting from the factory)

• Alarm: 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 ask the standby unit to start. Standby

activation is achieved on alarms ONLY; messages or warnings will not start the 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 *.