User manual

Service Menu Parameters
129 Liebert
®
iCOM
®
S158 Fanspeed Filter at 0-100%—This parameter should only be adjusted by a factory service
trained technician. Fan Cap Filter at 0% / 100% controls the rate of change during fan speed changes
to avoid overshoots. The filter value depends on the current control deviation from the setpoint. On
the setpoint (at 0%), it’s typically set lower (slow), and at the end of the P-band (at 100%) it’s typically
set higher (faster). The value is given in % control output change per second. This parameter sets the
rate of change based on where actual temp is when compared to setpoint.
S159 Fanspeed Transition Filter—This parameter should only be adjusted by a factory service
trained technician. The transition fan speed filter controls how quickly the fan speed changes
between different modes of operation. For example, if the fans are operating based on a call for reheat
which is normally 100% fan speed and the reheats are turned Off or no longer needed then the fan
speed would instantly change if this filter is not applied, which may cause instability in the fan speed
control. This filter helps with the transition to avoid overshoot.
S160 Fanspeed Reposition Mode/Delay Decel/—This parameter should only be adjusted by a
factory service trained technician. The fan speed reposition mode / delay is a one time delay as the fan
speed is requested to change direction. This delay will be applied only when the fan speed is
commanded from an increasing to decreasing state or a decreasing to increasing state. This allows the
fan to hold its current position while the temperature stabilizes.
S161 Max DecelerationRate—This parameter should only be adjusted by a factory service trained
technician. Only slows the decreasing of the variable fan speed. The control will use the slower of this
parameter and the fan speed filter.
S162 BMS Backup Fan Setpoint—Selects a fan speed setpoint that will be activated in the event of
a BMS Timeout. The BMS timer must be configured for this parameter to activate.
S163 BMS Backup Fan Operation—Sets the default operation for the fan speed control when a
BMS Timeout occurs. Default is disabled which will keep the fan speed at the last value before the
disconnect occurred. STD speed will ramp the fan to the STD speed setting. This will drive the fan
speed to its maximum speed. The control will use the slower of this Coupled will set the fan speed to
follow the cooling capacity. Backup Set will use the BMS Backup setpoint to drive fan speed.
S164 Allow BMS to change Fanspeed—Enables or disables BMS fan speed control. When this
parameter is disabled, the BMW will not have write capability to this point.
S165 High Temp Limit Approach—Sets the sensor to be used to increase the fanspeed value above
the fanspeed setpoint STD to the value set in the Analog Out high limit. This parameter is selectable
from Disabled, Supply and Return. The factory default is Return.
S166 High Temp Limit Approach At—Sets the temperature differential below the high supply and
high return temperature limit where the fan speed would increase from fanspeed setpoint STD to
fanspeed MAX. This parameter is selectable from 0 - 10°F. The factory default is 2°F.
S16A FC / AirEco Ramp Up w/CFC—Sets the selection to decouple the fan output from the call for
cooling. This parameter is selectable from No or Yes. The factory default is No.
S16B EC-Fan Mode—Shows the status of the EC-Fan Mode. When the selection is shown as full, the
normal fanspeed control is being utilized. When the selection is shown as light, the fan control sensor
is forced to manual. This is used for the Liebert HPM
™
only.