Viconics R820 Series User manual

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 Ωcontrol 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.

2
SPECIFICATIONS HIGH VOLTAGE WIRING
Operating
Conditions:
0°C to 80°C ( 32°F to 176°F )
0 % to 95 % R.H. non-condensing
See power derating curves document
Thermostatic
protection:
Self resetting. Auto shut off when SCR
ambient temp. is above 82°C ( 180°F )
Power supply: 24 Vac -15%, +10% 50/60 Hz; 2 VA
Use a Class 1 ( properly fused ) or
Class 2, CSA or UL recognized
transformer.
General cautions:
•High voltages are present on the terminals of these
devices. Please read all the instruction in this manual carefully.
•The 45 & 75 Amps models need to be wired with the supplied
high voltage lugs. Attach the wire to the lug first, then screw
the lug to the power module.
•Have the wiring done by a qualified a skilled professional.
•High voltage and amperage can be fatal.
•All wiring must conform with national electrical code
regulations.
•The instrument must be wired before applying power.
•Protect circuits with semi conductor fuses.
•For in panel installation, derating amperage curves are
available from the factory.
Note:
These instruments have undergone rigorous tests and verifications prior to shipment to ensure proper and reliable operation in the
field. However, like other such products, they are subject to failure. It is therefore the responsibility of the installer / user / electrical
panel designer to incorporate safety features and devices ( such as relays, flow switch, thermal protections, etc….. ) to protect the
entire system from catastrophic failure.
R820 DIMENSIONS & INSTALLATION
•Mounting instructions & templates are available from the factory.
•The cutout templates include holes position for heatsink attachment to the electrical cabinet
R810 & single phase R820 will have 2 mounting screw, 1 on each side.
Three phase R820 will have 4 mounting screw, 2 on each side.
•Respect mounting orientation ( this side up ).
•Mount the heatsink vertically on the side of the cabinet for proper heat dissipation.
•If mounted on top or bottom of the cabinet, derate maximum usable amperage by 25%.
•Do not relocate the power switching modules on the heatsink.
Typical template: Typical installation:
5.25"
Cutout hole
Heatsink contour
Dia=0.19"
A
B
B
C
C
3.00"
D
1.125"
1.125"
"A" Template

3
R820 single phase ABCDWeight (LBS)
R820-211 4.5 " 2.25” 0.375” 3.75” 1.80
R820-321 4.5 " 2.25” 0.375” 3.75” 1.80
R820-341 6.5 " 3.25” 1.375” 3.75” 2.40
R820-421 4.5 " 2.25” 0.375” 3.75” 1.80
R820-441 6.5 " 3.25” 1.375” 3.75” 2.40
R820-471 10.0 " 5.00” 3.125” 3.75” 3.50
R820-621 4.5 " 2.25” 0.375” 3.75” 1.80
R820-641 6.5 " 3.25” 1.375” 3.75” 2.40
R820-671 10.0 " 5.00” 3.125” 3.75” 3.50
R820 three phase ABCDWeight (LBS)
R820-213 6.5 " 3.25” 0.375” 5.75” 2.60
R820-323 10.0 " 5.00” 2.125” 5.75” 3.70
R820-343 10.0 " 5.00” 2.125” 5.75” 3.70
R820-423 6.5 " 3.25” 0.375” 5.75” 2.65
R820-443 10.0 " 5.00” 2.125” 5.75” 3.70
R820-623 6.5 " 3.25” 0.375” 5.75” 2.65
R820-643 10.0 " 5.00” 2.125” 5.75” 3.70
2.00"
5.25"
A
3.00"
5.75"
Cutout
template
5.25"
A
2.00"
3.00"
3.75"
Cutout
template

4
DIP SWITCH ADJUSTMENTS PER APPLICATIONS
INPUT SIGNAL 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 Ωcontrol signal On On Off Off
TYPICAL APPLICATIONS
0 To 10 Vdc Room Or Duct Thermostat Control
Dip switch position S1 S2 S3 S4
0 to 10 Vdc control signal Off Off Off On
0 To 10 Vdc From a Building Automation System
Dip switch position S1 S2 S3 S4
0 to 10 Vdc control signal Off Off Off On
Modulating Room Thermostat
0 to 10 Vdc
Modulating Supply Air Control Thermostat
0 to 10 Vdc
0 to 10 Vdc
Modulating Signal From BAS System
2 Vdc = 0% capacity
10 Vdc = 100% capacity
24 Vac
Common
Input
2nd SSR on 3 phase
models only
1
2
3
L1
L2
L3
To load
( controlled leg )
To load
( controlled leg )
To load
( uncontrolled leg )
Common
24 Vac
0 to 10 Vdc
output
-
+
2 Vdc = 0% capacity
10 Vdc = 100% capacity
24 Vac
Common
Input
2nd SSR on 3 phase
models only
1
2
3
L1
L2
L3
To load
( controlled leg )
To load
( controlled leg )
To load
( uncontrolled leg )

LIT-R820X-E02 5
0 To 135 ΩRoom Or Duct Thermostat Control
Dip switch position S1 S2 S3 S4
0 to 135 Ωcontrol signal On On Off Off
4 To 20 mA From a Building Automation System
Dip switch position S1 S2 S3 S4
4 to 20 mA control signal Off Off On Off
24 VAC POWER & WIRING
•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.
Viconics Electronics Inc. 9245, Langelier Blvd, St-Leonard, Quebec, Canada H1P 3K9 www.viconics.com
[e-mail]
Modulating Room Thermostat
0 to 135 Ohms
50
60
70
80
90
Modulating Supply Air Control Thermostat
0 to 135 Ohms
50
60
70
80
90
4 to 20 mA
Modulating Signal From BAS System
24 Vac
Common
Input
2nd SSR on 3 phase
models only
1
2
3
R
W
0 Ohms = 0% capacity
135 Ohms = 100% capacity
L1
L2
B
L3
To load
( controlled leg )
To load
( controlled leg )
To load
( uncontrolled leg )
4 mA = 0% capacity
20 mA = 100% capacity
-
+
24 Vac
Common
Input
2nd SSR on 3 phase
models only
1
2
3
L1
L2
L3
To load
( controlled leg )
To load
( controlled leg )
To load
( uncontrolled leg )