Control Concepts Single Phase Zero Cross SCR Power Control
SINGLE PHASE, ZERO CROSS
The term Zero-Cross (synchronous operation of SCR's) is derived
from the fact that the SCR's are turned on only when the instantaneous
value of the sinusoidal wave is zero. In Zero-Cross operation, power is
applied for a number of continuous half-cycles and then removed for a number
of half-cycles to achieve the desired load power in the same manner as
power would be controlled with a mechanical switching device. The frequency
of the on-off cycles can be extremely fast because there is no limit to
the number of switching operations the SCR can perform.
The following models are suited for applications with
Single Phase, Zero-Cross requirements.
|
MODEL
|
FEATURES
|
COMMAND
|
VOLTAGE
|
CURRENT
|
APPROVAL
|
1020
Specs
|
4/20 mA Loop Powered
|
4/20mA Only
|
120 to 575Vac
|
10 to 40 & 70 Amps
|
UL Listed
|
1021A
Specs
|
Compact |
Most Commands |
120 to 575Vac |
10 to 40 & 70 Amps |
UL Listed |
1021B
Specs
|
Sync-Guard |
Most Commands |
120 to 575Vac |
10 to 40 & 70 Amps |
UL Listed |
1023
Specs |
Time proportional & 4/20
mA Loop Powered |
4/20mA Only |
120 to 575Vac |
10 to 40 & 70 Amps |
UL Listed |
1024
Specs |
On-off control |
3 to 32 Vdc
90 to 280V ac |
120 to 575Vac |
10 to 40 & 70 Amps |
UL Listed |
1026
Specs
|
On-off control
|
120Vac or 240Vac
|
120 to 575Vac
|
10 to 40 & 70 Amps
|
|
1024A
Specs |
On-off control |
90 to 280 Vac |
120 to 575Vac |
10 to 40 & 70 Amps |
UL Listed |
1027A
Specs |
Sync-Guard, Trans-Guard &
Line Voltage Compensation |
Most Commands |
120 to 575Vac |
50 to 750 Amps |
UL Listed |
1031
Specs |
Adaptable to 'Run/Idle' Configuration |
1 to 5 Vdc & Pot. |
120 to 575Vac |
10 to 40 & 70 Amps
|
UL Listed |
| 1037A |
Shorted SCR Detection |
Most Commands |
120 to 575Vac |
50 to 750 Amps
|
UL Listed |
Single Phase, Phase Angle
Three Phase, Phase Angle
Three Phase, Zero Cross
Special Controllers & Accessories
DIN-Pak Solid State Relay
McGoff-Bethune, Inc.
5970 Unity Drive Suite A
Norcross, GA 30071
770-840-9811 800-303-4705
Fax: 770-840-7514
sales@mcgoff-bethune.com
www.mcgoff-bethune.com
McGoff-Bethune, Inc.
101 Meadow Dr. STE 2R
Cumming GA 30040
770-840-9811 800-303-4705
Fax: 770-840-7514
sales@mcgoff-bethune.com
www.mcgoff-bethune.com
|