Emerson Liebert iCOM User Manual download pdf (Page 71)

Service Menu Parameters

Figure 49 Setpoints screen, page 3 of 6

Supply Sensor—Selects how the supply sensor will be used by the control. The choices are Disabled,

Cooling Only, Control and Limit. See 3.7 - Supply Control for a detailed description. The supply

sensor can only be set to Cooling Only and Control on chilled water units. The chilled water unit must

have the valve feedback if the valve type is a 3P valve (actuator). Proportional control actuators used

on motorized ball valves do not require the feedback feature.

Supply Setpoint—Sets the temperature setpoint for the supply sensor when it is set to Cooling

Only, Control or Limit.

Supply Control Type—Selects the type of control the system will use to activate cooling. A detailed

description of each control type can be found in 3.6 - Control Types.

Supply Proportional Band—Adjusts the valve’s rate of change based on the actual sensor values

deviation from setpoint when the supply sensor is set to Cooling Only or Control. The smaller this

number, the faster the valve(s) will increase cooling capacity. Too small of a number may cause the

unit to excessively reposition the valve.

Supply Integration—Adjusts the capacity of the unit based on time away from setpoint so that

accurate temperature control can be maintained. This parameter is active only when Control Type is

set to “PI.”

Supply Deadband—Prevents overshooting of the setpoint and cycling between the reheats and

cooling. The value entered into this field will be split in half by the temperature setpoint. Example: If

the temperature setpoint is 60°F (15.5°C) and a 4°F (2.2°C) deadband is set then no cooling will be

activated until 62°F (16.6°C) and no heating will be activated until 58°F (14.4°C) is reached.

Valve Pulse—Defines the minimum change in the cooling requirement before the valve will

reposition. A greater number decreases the amount of repositions and a smaller number will increase

the response of the valve.

Cooling Filter at 0% / 100%—Controls the rate of change during a valve position 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.

Return Compensation—For supply control only. Defines the maximum increase allowed to the

supply temperature setting to maintain a minimum return temperature setpoint. When the return

air temperature is above its setpoint, the supply air setpoint remains unchanged. As the return air

temperature drops below the setpoint, the supply air setpoint will be proportionally increased to

maintain the return temperature setpoint. The maximum increase is defined with the return

compensation parameter.

SETPOINTS (pg 3 of 6)

to change parameter

to confirm

to select parameter

for next/previous unit

then

UNIT 01

PASSWORD (Actual Level 0) ????

Supply Sensor Control

Supply Setpoint 50°F

Supply Control Type Proportional

Supply Proportional Band 12°F

Supply Integration min

Supply DeadBand 0°F

Valve Pulse 3%

Cooling Filter at 0% / 100% / 100.00 / 100%/s

Return Compensation 5°F

S123

S124

S125

S126

S127

S128

S129

S130

S131

S132

S133

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Emerson Liebert iCOM User Manual Page 71

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