Emerson Liebert iCOM, Manual

Page: 70 / 172

Operation
Liebert
®
iCOM
®
for Liebert DSE
™
62
3.9.1 High- and Low-Temperature and Humidity Events
High- and low-temperature and humidity alarms can be set for both the internal and optional
external sensors. If a sensor reading exceeds a preset threshold, a warning will appear. These
warnings are ignored after unit startup for a minimum of 1 minute. To increase the delay to warn, see
3.9 - Event Types and Properties . The threshold settings are located in both the User and Service
menus under Set Alarms.
To apply threshold limits on the internal cooling unit sensors, the Return Sensor Alarms must be
enabled. The high and low temperature and humidity internal sensor thresholds can then be set. To
apply threshold limits on the optional external sensors, the Sensor A alarms must be enabled. The
high and low temperature and humidity external sensor thresholds can then be set. If no external
sensors are connected to the unit, it is recommended that the Sensor A Alarms be disabled.
3.9.2 User Inputs
The user can connect and specify up to four custom alarm inputs, also known as remote alarm devices
(RAD), depending on unit configuration. Each input can be programmed to provide information about
an event associated with the unit or space.
Each input is wired to terminal 24 through a dry contact to locations 50, 51, 55 and 56, respectively,
for alarms 1 through 4. See unit electric schematic and installation manual terminal location.
The customer input configuration settings are in the Service menu under Set Alarms > Screen 2 of 7.
The choices for the customer inputs are shown in Table 10 along with their associated reaction. The
customer inputs can be programmed as normally open or normally closed to alarm.
Table 15 Alarms specific to the EEV
Event Description
EEV 1 or 2 Communication Error
This event is triggered if the iCOM control looses communication with the EEV
board. The compressor(s) will shut off and the unit will exit EconoPhase while
the error is active.
EEV 1 or 2 Sensor Error
This event is triggered if the iCOM control looses communication with one of
the connected EEV sensors. A sensor failure may be indicated by a loss of
sensor input reading for more than 10 seconds or 4 losses within a 30 minute
window. EEV sensor input readings are located in the advanced menu setting.
The compressor(s) will shut off and the unit will exit EconoPhase while the error
is active.
EEV 1 or 2 Motor Error
The iCOM control has indicated a problem with the stepper motor. The
corresponding compressor(s) are disabled until power is cycled.
EEV 1 or 2 Low Superheat
The superheat dropped below 1°F (-17°C) for one minute. The corresponding
compressor(s) are disabled until power is cycled.
EEV 1 or 2 High discharge temp
The discharge temperature has reached 266 °F
(130 °C). The corresponding compressor(s) are disabled until power is cycled.
EEV 1 or 2 Feedback Failure
The iCOM control monitors the stepper motor feedback to ensure accurate
superheat and efficient EconoPhase operation is achieve. If three or more
feedback errors are detected in a rolling 1 hour period, the event will become
active. The corresponding compressor(s) are disabled until power is cycled.
EEV 1 or 2 Driver Failure
The event is triggered by iCOM if three or more driver events are detected
within a rolling 1 hour period. A driver event occurs when the EEV
unexpectedly closes with the compressor(s) ON, without a reason being
reported. The compressor is stopped each time a driver failure occurs.
NOTE
The event messages will automatically reset if the temperature/humidity stays 1.8°F
(1°C)/ 2% RH below or above the threshold for one minute.
NOTE
To enabled/disabled, delay activation and set event type (alarm, warn, message) see Event
Types on page 57 .