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Service Menu Parameters
67
Figure 51 Setpoints screen, page 5 of 6
VSD Fanspeed—Sets the control type for a Variable Fanspeed device, which includes Variable
Frequency Drives and EC fans. Selection options are Auto, Manual, Economy, Delta, Return and
Supply control. See 3.1.1 - Unit/Fan Control for details of each control.
Airflow Calibration—Allows the front display to be scaled to show the actual percentage of airflow
independent of the voltage operating the fan speed. This value cannot be set above the Analog Output
High Limit or below the Analog Low Limit for the fan set in the Advanced Menu.
VSD Setpoint MIN/STD—Sets the fanspeed for the VSD. “MIN” sets the minimum speed that the
fan will operate at. Fan speed is modulated between the “VSD Setpoint MIN” and “VSD Setpoint
STD” based on either the call for cooling (Auto Control) or other fanspeed control settings determined
by the VSD Fanspeed. When VSD Fanspeed is set to Auto, Economy or Delta control, the “STD”
setting on this parameter is the high limit for the fan speed output. If VSD Fanspeed is set to Manual,
this parameter is the actual running speed of the fan. The VSD Setpoint MIN and STD settings are
expressed as a percentage of the Airflow Calibration setting.
VSD Setpoint Dehum/No Power—Sets the fixed fan speed the fan will operate at when there is a
call for dehumidification. The factory default setting for chilled water units is 60% which helps to
keep the coil in a latent or dehumidification mode. When set to “No Power,” this parameter sets the
fan speed applied when a Customer Input set to “No Power” is activated. These settings are expressed
as a percentage of the Airflow Calibration setting.
Fanspeed Change at 0% / 100%—Controls the rate of change during a fan speed adjustment 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.
Fanspeed Reposition Delay—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—Sets the temperature delta between the two cold aisle containment sensors. This
delta is maintained to ensure that there is sufficient airflow inside the containment area.
Fanspeed P-Band—Sets the proportional band when fanspeed is in Delta control mode.
Fanspeed Integration—Sets the integration time when fanspeed is in Delta control mode.
NOTE
Fixed fan speeds are also set during Heating and Humidification modes. These settings are
determined by the manufacturer to prevent excessive heater temperatures and condensation
and are typically set at 100% fanspeed.