Viconics R850 Installation Guide Bedienungsanleitung PDF herunterladen (Seite 2)

2 To 10 Vdc Or 0 To 10 Vdc Stand Alone Thermostat

( Power To The Thermostat Is Supplied By The R850V )

0 To 135Ω Stand Alone Thermostat

2 To 10 Vdc Or 0 To 10 Vdc From D.D.C.

Building Automation System

4 To 20 mA From D.D.C.

Building Automation System

24 VAC POWER & RELAY OUTPUT WIRING

The wiring diagrams are for the R850V-8 models with 8 outputs. The wiring for the R850V-4 is the same except that the unit only

has 4 outputs.

Terminals

Screw terminal & connector #1 Common

Screw terminal & connector #2 24 Vac

Screw terminal & connector #3 Control Signal input

• It is not necessary to ground any leg of the transformer to earth with the controller card.

• The controller uses internally a half wave rectifier bridge. On 0 to 10 Vdc control signal, the reference of the control signal is the

Common of the power supply of the SCR controller card.

• Use a Class 1 ( properly fused ) or Class 2, CSA or UL recognized transformer.

•

4 STAGE APPLICATION R850V-4

R850V-4 Control SwitchNumber

of stage

Switch #3 Switch #4

1 Off Off

2 On Off

3 Off On

4 On On

Common

24 Vac

0 to 10 Vdc

output

2 Vdc = 0% capacity

10 Vdc = 100% capacit

123

0 Ohms = 0% capacity

135 Ohms = 100% capacit

123

2 Vdc = 0% capacity

10 Vdc = 100% capacit

123

4 mA = 0% capacity

0 mA = 100% capacit

123

JUNE 99

REV.1

TEST

RATIO(%)

100

200

150

VR2

001-0102

DELAY(s)

120

12 3

COM

POWER

123

24 Vac contactor coils

C2 C3 C4

R850V-4

1 2 3 4 5 6

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