028-5009-04_LIT-R851V-E06-EN
Sep-19
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R851V DIMENSIONS & INSTALLATION
ON
ON
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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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