1
R820 SERIES
SCR POWER CONTROLS
•
240 Vac up to 600 Vac models
•
10 Amps up to 75 Amps models
•
1 phase or 3 phase models
DESCRIPTION
The Viconics R820 series SCR power controls are designed
for cost effective, precise modulation of electric loads for
most electric heating applications.
(
Applicable on resistive loads only
)
The R820
series consists of SCR’s power controls, c/w
factory assembled heatsink for surface or in-panel mounting.
FEATURES
•
Microcomputer
based.
•
Dip
switch
configurable
•
Integrated over temperature thermostatic protection (self
resetting) Auto shut off when SCR ambient temperature
is above 82°C ( 180°F )
•
Complete with factory installed heatsink
•
For surface or in-panel mounting
•
CSA
approved for Canada and USA
•
UL
recognized
•
Pulse status led for servicing & trouble shooting
•
2 years warranty
They are compatible with many industry standard signals. A
typical application would be to control a modulating electric
duct heater with a 0 to 10 Vdc control signal from an analog
room thermostat. The R820 power controller also contain
four dip switch to adjust to the following control signals:
•
0 to 10 Vdc control signal ( 2 to 10 Vdc control range )
•
4 to 20 mA control signal
•
0 to 135
Ω
control signal
SCR INSTALLATION
Important.
All external safety devices like: contactors, relays, flow
switch & thermal protections are to be supplied and
installed by other.
When the SCR is installed inside a panel, the enclosure
needs to be adequately louvered for proper ventilation
and heat dissipation. Call the factory for the derating
amperage curves for these specific applications.
Electronic controls require special care for wiring and
startup. To avoid problems, carefully follow the
procedures below.
Look at the wiring diagrams, and study them carefully. Be
sure that you understand how the system is supposed to
work.
A)
Location:
1- Can be installed inside a louvered approved cabinet
or with the heatsink mounted externally.
2- Must be installed away from excessive heat source.
3- Nothing must restrain air circulation to the heatsink.
B)
Installation:
1- If installed completely inside a cabinet, use the
mounting tabs on the heatsink to secure the SCR to
the back plate of the panel.
2- If installed with heatsink outside the cabinet, use the
proper model mounting template for the cut out
dimensions and to check for mounting obstructions.
3- Respect mounting orientation
( this side up ).
4- Mount the heatsink vertically on the side of the
cabinet for proper heat dissipation.
5- Do not relocate the power switching modules on the
heatsink.
HOW TO ORDER
Models Available
Maximum Voltage
Maximum Amperage
Phase
R820-211
Up to 240 V.
10 A.
1 Phase
R820-213
Up to 240 V.
10 A.
3 Phase
R820-321
Up to 347 V.
25 A.
1 Phase
R820-323
Up to 347 V.
25 A.
3 Phase
R820-341
Up to 347 V.
45 A.
1 Phase
R820-343
Up to 347 V.
45 A.
3 Phase
R820-421
Up to 480 V.
25 A.
1 Phase
R820-423
Up to 480 V.
25 A.
3 Phase
R820-441
Up to 480 V.
45 A.
1 Phase
R820-443
Up to 480 V.
45 A.
3 Phase
R820-471
Up to 480 V.
75 A.
1 Phase
R820-621
Up to 600 V.
25 A.
1 Phase
R820-623
Up to 600 V.
25 A.
3 Phase
R820-641
Up to 600 V.
45 A.
1 Phase
R820-643
Up to 600 V.
45 A.
3 Phase
R820-671
Up to 600 V.
75 A.
1 Phase
**
Only 2 legs of the circuit are controlled on 3 phase systems
.
