Viconics R851 Manual

Analog 0 to 10 Vdc vernier stage
•
• 8 step models
Up to 16 stage total with a slave unit
•
• Test button
DESCRIPTION
The Viconics R851B series step controller is designed for cost-
effective, precise modulation of multi-stage control applications. A
common application is a multi-step electric boiler.
An integrated vernier control output will give a precise and full
modulation of the load from 0 to 100% of the total capacity.
FEATURES AND BENEFITS
Microcomputer-based design
Adjustable step-up and step-
downtime delay
Adjustable Vernier ratio
0-10 Vdc analog Vernier
output
Up to 16 stages
Progressive or linear
sequencing
Test button
MODELS AVAILABLE
The R851B is available in 1 model
R851B-8 8 stage unit
•
If more than 8 stages are required, the R851B-8 can be used as a
master unit with another R851B as a slave unit. Adding another unit
can bring the total step number up to 16.
INPUT SIGNAL
The R851B has four INPUT dip switch (S1 to S4) to select the control signal input: They are compatible with industry-standard signals.
DIP SWITCH ADJUSTMENTS & WIRING CONTROL INPUT
Input Signal Switch
0 to 10 Vdc control signal ( 2 to 10 Vdc control range )
4 to 20 mA control signal
If a slave unit is used, wire the control signal input to the master unit only
028-5008-04 LIT-R851B -E04-EN
R851B STEP CONTROLLER
WITH INTEGRATED VERNIER STAGE
Accuracy and reliability
Tailor to exact application
Simplifies design of
proportional stage
Permits use of SCR power
controller
One product family can handle
all applications
Increased flexibility
Quick troubleshooting
Innovative Control Solutions For Your Needs
SPECIFICATIONS
Operating conditions:
0°C to 80°C ( 32°F to 176°F )
0 % to 95 % R.H. non-condensing
Relay outputs:
Pilot duty:
- 24 - 120 Vac – 720 VA
- 240 Vac – 690 VA
Motor load:
- 120 Vac – 1 HP
- 240 Vac – 2 HP
Vernier stage: 0 to 10 Vdc, 5 mA max.
Input impedance: 0 to 10 Vdc into 10 KΩ minimum
Power supply: 24 Vac -15%, +10% 50/60 Hz; up to18 VA
Use a Class 1 ( properly fused ) or Class 2, CSA or UL recognized
transformer for power supply & relay outputs.
Agency Approval: cULus File # E212649
Specifications and equipment are subject to change without prior notice.
OVERRIDE TEST BUTTON
The override test button can be used to by-pass the interstage delay and
bring on all stages at one time. This simplifies the verification of the
configured maximum number of stages. A status led per step will come on
for each of the configured stages.
Switch #1 Switch #2
Off Off
Off Off
Oct-20
Switch #3 Switch #4
Off On
On Off
1