1
R851V STEP CONTROLLER
WITH INTEGRATED VERNIER STAGE
•
Pulsed or analog 0 to 10 Vdc vernier stage
•
4 or 8 step models
•
Up to 16 stage total with a slave unit
•
Test button
DESCRIPTION
The Viconics R851V series step controller is designed for
cost effective, precise modulation of multi-stage control
application. A common application is a multi step electric
duct heater.
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
Accuracy and reliability
Adjustable inter-stage delay
Provides flexibility in
replacement applications
Adjustable Vernier ratio
Simplifies design of
proportional stage
Choice of pulsed or analog
Vernier output
Permits use of SCR or lower
cost SSR
Up to 16 stages
One product family can handle
all applications
Choice of LIFO or FIFO
sequencing
Increased flexibility of FIFO
permits even use of contactors
Test button
Quick troubleshooting
MODELS AVAILABLE
The R851-V is available in 2 models
•
R851V-4
4 stage unit
•
R851V-8
8 stage unit
If more than 8 stages are required, the R851-V8 can be used as
a master unit with another R851V as a slave unit. Adding
another unit ( R851V-4 or R851V-8 ) can bring the total step
number up to 12 or 16.
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.
Vdc pulsed, 6 Vdc, 30 mA max.
Input
impedance:
0 to 10 Vdc into 10 K
Ω
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.
UL recognized:
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 stage at one time. This simplifies the
verification of configured maximum number of stages. A status
led per step will come on for each of the configured stage.
INPUT SIGNAL
The R851V 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
Switch #1
Switch #2
Switch #3
Switch #4
0 to 10 Vdc control signal ( 2 to 10 Vdc control range )
Off
Off
Off
On
4 to 20 mA control signal
Off
Off
On
Off
0 to 135
Ω
control signal
On
On
Off
Off
If a slave unit is used, wire the control signal input to the master unit only
Innovative Control Solutions For Your Needs
(2) Vernier stage selection
OFF = 0 to 10 Vdc (SCR)
ON = Vdc pulsed signal (SSR)
4 to 20 mA
0 to 135
Ω
2
1
3
4
ON
2
1
3
4
(1) Sequence of operation
(LIFO or FIFO)
OFF = LIFO (Last IN, First OUT)
ON = FIFO (First IN, First OUT)
R851V-8
0 to 10 Vdc
signal selection
(1-4) Input
ON
2
1
3
4
ON
I
N
P
U
T
2
1
4
3
S
ON
1
W
(3-6) Number of steps selection
(see next pages for details)
C
O
N
T
R
O
L
4
2
1
3
5 6
S
ON
2
W
4 to 20 mA
(2) Vernier stage selection
OFF = 0 to 10 Vdc (SCR)
ON = Vdc pulsed signal (SSR)
(1) Sequence of operation
(LIFO or FIFO)
OFF = LIFO (Last IN, First OUT)
ON = FIFO (First IN, First OUT)
Ω
0 to 135
1 2 3
4
ON
1
3
2
4
2
W
S
(3-4) Number of steps selection
(see next pages for details)
S
signal selection
(1-4) Input
0 to 10 Vdc
ON
1
3
2
4
ON
I
N
P
U
T
1
3
2
44
C
O
N
T
R
O
L
3
1 22
4
W1
R851V-4
ON
ON
