Viconics R851V Series User manual

028-5009-04_LIT-R851V-E06-EN Sep-19 1
Innovative Control Solutions For Your Needs
R851V STEP CONTROLLER
WITH INTEGRATED VERNIER STAGE
•Pulsed or analog 0 to 10 Vdc vernier stage
•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 R851V is available in 1 model
•
R851V-8 8 stage unit
If more than 8 stages are required, the R851B
-8 can be used as a
master unit with another R851
V as a slave unit. Adding another unit
can bring the total step number up to 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 KΩminimum
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 stage at one time. This simplifies the verification of configured
maximum number of stage. 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
If a slave unit is used, wire the control signal input to the master unit only

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24 VAC POWER & RELAY OUTPUT WIRING
The wiring diagrams are for the R851V-8 models with 8 outputs. The wiring for the R851V-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.
20 mA = 100% capacity
ON
1 2 3
10 Vdc = 100% capacity
ON
1 2 3 4
4
1
1 2 3
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Number of
stage
1
2
3
4
5
6
7
8
R851V-8 Control Switch
Switch #3
Switch #4
Switch #5
Switch #6
Off
Off
Off
Off
On
Off
Off
Off
Off
On
Off
Off
On
On
Off
Off
Off
Off
On
Off
On
Off
On
Off
Off
On
On
Off
On
On
On
Off
8 STAGE APPLICATION
R851V-8
ON ON
2 3 4 1 2 3 4 5 6
16 STAGE APPLICATION R851V-8 MASTER UNIT, R851V-8 SLAVE UNIT ( See also slave application section at the end )
ON ON ON ON
1 2 3 4 1 2 3 4 5 6 1 2 3 4 1 2 3 4 5 6
R851V-8 Master Unit Control Switch
Switch #3 Switch #4 Switch #5 Switch #6
Off Off Off On
On Off Off On
Off On Off On
On On Off On
Off Off On On
On Off On On
Off On On On
On On On On
The intensity of the yellow status LED on the master unit is proportional to the slave
output.
Note: Set all control signal INPUT dip switch to OFF
on slave unit.
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Number
of stage
9
10
11
12
13
14
15
16
R851V-8 Slave Unit Control Switch
Switch #3
Switch #4
Switch #5
Switch #6
Off
Off
Off
Off
On
Off
Off
Off
Off
On
Off
Off
On
On
Off
Off
Off
Off
On
Off
On
Off
On
Off
Off
On
On
Off
On
On
On
Off

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R851V DIMENSIONS & INSTALLATION
ON ON
1 2 3 4 1 2 3 4 5 6
Install on the mounting plate on the electrical cabinet using five #6 pan head metal screw. Do not over torque the screws
to prevent damage to the board. Specifications and equipment are subject to change without prior notice.
LIFO / FIFO ADJUSTMENT
The R851V series features 2 different staging sequences:
•LIFO LAST IN FIRST OUT ( CONTROL SWITCH #1 OFF, FACTORY DEFAULT )
This is the regular mode. Stage #1 will always be the first to energize and the last stage to de-energize
•FIFO FIRST IN FIRST OUT ( CONTROL SWITCH #1 ON )
In this mode, the stages are rotated to ensure a more uniform wear of the contactors and elements. For example, on an
increase in demand, stage 1 will be energized following by stage 2, etc. On a decrease in demand, stage 1 will de-energized
first followed by stage 2, etc.
Please verify that if this mode is enabled, the manufactured product still complies with active codes and regulations.
VERNIER STAGE SELECTION AND WIRING
The Viconics R851V series step controller has an integrated vernier control output. This output will give a precise and full
modulation of the load from 0 to 100% of the total capacity of the unit. If a master slave application is used, always connect
the vernier output of the master unit.
ADJUSTMENTS
Functions of the units can be configured with six dip switch and 2 potentiometers.
0 to 9 min.
5 to 60 sec.
Interstage delay potentiometer setting
Two potentiometers are used to adjust the interstage delay from 5 seconds up to10 minutes.
This delay is active in 3 ways.
• Minimum time delay between each step activation when the control signal rises
• Minimum ON time when the step is activated
• Minimum time delay between each step de-activation when the control signal drops
150
125 175
100 200
Vernier stage ratio
A potentiometer is used to adjust the vernier stage ratio from 100% to 200% capacity of the other on/off
stage capacity.
All R851V series controls are for use only as operating controls. Whenever a control failure could lead to personal
injury and/or loss of property, it becomes the responsibility of the user to add safety devices and/or alarm system
to protect against such catastrophic failures.
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RATIO SETTING ( See also slave application section at the end )
First adjust the vernier stage ratio potentiometer. This will insure a smooth capacity rise of the total load.
Example 1:
The total unit has 100 kW divided in 10 equal stage of 10 kW.
If only 10 kW is used as the modulating stage, then the heater would have 9 on/off mechanical stage plus
one modulating stage. This modulating stage has the same value as all the other stage. Adjust the vernier stage ratio
potentiometer to 100%.
Example 2:
The total unit still has 100 kW divided in 10 equal stage of 10 kW.
If 20 kW are used as the modulating stage, then the heater would have 8 on/off mechanical stage plus one
modulating stage. The modulating stage has twice the value as all the other stage. Adjust the vernier stage ratio
potentiometer to 200%.
•TYPE OF VERNIER STAGE SETTING
The vernier stage output can be configured to operate either as a:
• Vdc pulsed output to activate an R810 power module
• 0 to 10 Vdc analog output to activate an R820 SCR power controller.
•VERNIER STAGE WIRING
Do not wire more than six R810 power module on the
vernier stage output
Respect the polarity between the R851 step controller
board an the R810 power modules
Connect
V to +
Connect COM to -
R810
Vdc pulsed to activate R810 power modules
-
+
The green status LED on the master unit will cycle at
the same rate as the time proportioning vernier output
For more information, please refer to the R810 service
manual
Set the R820 SCR power controller to accept a 0 to 10 Vdc control signal input
Switch
#1, #2 & #3 Off Switch #4 On
The intensity of the green status LED on the master unit is proportional to vernier output
For more information, please refer to the R820 service manual
R820
SCR Power Controller
ON ON
1 2 3
I NPUT CONT ROL
1 2 3 4 1 2 3 4 5 6
1 2 3
150
VR2
100 200
RATIO(%)
Control Switch #2 Off
Control Switch #2 On
S
V
COM
0 to 10 Vdc analog output to activate R820 SCR power controller

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SLAVE APPLICATION SECTION
When using a unit for slave applications, it is important that the proper adjustments & setting be made to the unit for proper
operation of the system.
The yellow LED near the vernier output connector is proportional to the vernier output of the master unit ( 0 to 5 Vdc ).
On the slave unit:
•Set vernier ratio potentiometer to 100%
•Set interstage delay potentiometer to the same value as the master unit
ON
•Set all control signal INPUT dip switch to OFF
TEST MODE BUTTON
The test mode button can be used to verify if the number of stage have been configured properly.
1. Press and hold the button for 3 to 4 seconds.
2. If a slave unit is used, press & hold the 2 units button simultaneously
3. All the selected stage will come on, one after the other until all selected number of stages are all on.
4. There is a delay of approximately 5 second between each step activation.
5. When all selected stage are on, they will stay on for approximately 30 seconds before shutting down.
Powering up the R851V controller while holding down the test button will by-pass the interstage delay for 10 minutes. During
that period, the unit will respond to a changing signal input very rapidly. Also hold down slave test button on start-up if a
slave unit is used. After that 10 minute period, the unit will function normally with the interstage delays active
CALIFORNIA PROPOSITION 65
WARNING
CALIFORNIA PROPOSITION 65
This product can expose you to chemicals including Lead, which are known to the State of California to cause cancer and birth
defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Failure to follow these instructions can result in birth defects or other reproductive harm.
Viconics Technologies Inc.
7262 Marconi | Montreal | Quebec | Canada | H2R 2Z5
Tel.: [phone] | Toll free: 1 800.563.5660
[e-mail] | www.viconics.com
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