User Manual

Siemens Building Technologies Application :40 RWD62/40 - 02.2001

HVAC Products RWD62 1

RWD62/40

RWD62 Universal Controller

Application 40

Room temperature control

Chilled water control valve

Control (P or PI)

Room temperature control

Proportional control ( 0..10Vdc ) of the chilled water valve.

Optional day / night set point adjustment .

........RWD62.......

RWD62/40

Room temperature sensor

Time clock or switch

Modulating chilled water valve

Personal computer

Universal analogue input - main sensor

Auxiliary analogue input

Digital input

Analogue output

Communication port

• Room temperature sensor can be selected as Ni1000, Pt1000, or active sensor.

• Adjustable proportional band of analogue output Y1.

• Adjustable Integral action function selection and adjustment for Y1

• Day / night set points can be selected via time clock or switch.

Supplemental features

Control

Operating modes

PAGE 1
RWD62/40 RWD62 Universal Controller Application 40 Room temperature control Chilled water control valve Control (P or PI) Room temperature control Proportional control ( 0..10Vdc ) of the chilled water valve. X1 S1 Y1 PC RWD62/40 Optional day / night set point adjustment .
PAGE 2
Description of operation The temperature sensor senses the room conditions and on a rise in temperature the RWD62 via Y1 analogue output modulates the chilled water valve as determined by the cooling set point and proportional band (XP) setting. Cooling sequences Ouptut Voltagee Function diagram Y1 Max V Min V Load XP Cooling Cooling Setpoint RWD62/40 Connection diagram 24 V SP G B M X1 X1 M G GO S1 D1 M X2 M TOOL M Y1 GO Y..
PAGE 3
Main Display The main display shows , a) Y1 output in Volts dc. (0..10V = 0..100% range) b) Whether day or night set point is selected. ( ¤ = day, b = night) d) X1 value ( room temperature) in ° C. . Other displays are available by pressing the + button, and the various displays are listed below in sequence from the main display.