Service Menu Parameters
65
Figure 47 Setpoints parameters screen - Page 5
VSD Fanspeed
—This parameter sets the control type for a variable fanspeed device which includes
Variable Frequency Drives and EC Fans. Selection options are Auto, Manual, Economy and Delta
control. See section 3.1.1 for details of each control.
VSD Setpoint STD
—When VSD Fanspeed parameter is set to Auto, Economy or Delta control then
this parameter is the high limit for the fan speed output. If VSD Fanspeed is set to Manual then this
parameter is the actual running speed of the fan.
VSD Setpoint MIN
—This parameter is the minimum speed that the fan will operate. Fan speed is
modulated between the “VSD Setpoint MIN” and “VSD Setpoint STD”.
VSD
Setpoint Dehum
—This parameter sets the fixed fan speed the fan will operate at when there is
a call for dehumidification. The factory default setting is 60% which helps to keep the coil in a latent
or dehumidification mode.
VSD Setpoint No Power
—This parameter sets the fan speed when a Customer Input set to “No
Power” is activated.
Fanspeed Change at 0% / 100%
—This parameter filters the control’s reaction in order to avoid
overshoots. The filter value depends on the current control deviation. On setpoint (at 0%), it’s typi-
cally 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.
Fanspeed Reposition Delay
—This parameter sets the reposition delay that is applied only for
changes to decrease fanspeed; increases in fanspeed are controlled only by the fanspeed change speed
filter. After fanspeed is increased, the timer will prevent the speed from being reduced for the delay
duration.
Fanspeed Delta
—This parameter sets the temperature delta between the two Cold Aisle Contain-
ment sensors. This delta is maintained to ensure that there is sufficient airflow inside of the contain-
ment area.
Fanspeed P-Band
—This parameter adjusts the fans rate of change based on the actual sensor val-
ues deviation from setpoint or the delta. The smaller this number the faster the fan will increase its
speed. Too small of a number may cause the fans to excessively reposition.
Fanspeed Integration
—This parameter adjusts the fanspeed of the unit based on time away from
setpoint. This parameter is only active when Control Type is set to “PI.”
SETPOINTS (pg 5 of 6)
to change parameter
to confirm
to select parameter
for next/previous unit
then
UNIT 01
PASSWORD (Actual Level 0)
????
VSD Fanspeed
Delta
VSD Setpoint STD
100%
VSD Setpoint MIN
60%
VSD Setpoint Dehum
60%
VSD Setpoint No Power
100%
Fanspeed Change
0.20 / 1.00%/s
Fanspeed Reposition Delay
0sec
Fanspeed Delta
34°F
Fanspeed P -Band
36°F
Fanspeed Integration
5min
S145
S146
S147
S148
S149
S150
S151
S152
S153
S154
S155
Summary of Contents for Liebert Challenger 3000
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