Precision-control-systems 930 Manual do Utilizador Página 17
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Model 930 ControlIR
TM
Instruction Manual Operating Instructions
Research, Inc. Page 13 of 25
INPUT LINE VOLTAGE
FIRING
CIRCUITRY
CONTROL SIGNAL
GATING SIGNAL
OUTPUT LINE VOLTAGE
SCR 1
GATING SIGNAL
SCR 2
SCR 1
SCR 2
Figure 4-3 Conduction of two
SCRs connected in
reverse parallel when
turned on at the
beginning of
half-cycles
Principles of Phase Angle
Control
Figure 4-4 Conduction of two
SCRs connected in
reverse parallel when
turned on after
the
beginning of the
half-cycles
Because an SCR is a type of diode, it can conduct only during every other half-cycle of
the applied voltage. Therefore, SCRs used to control AC power are usually installed in
pairs, connected in reverse-parallel, as shown in figure 4-3. One of the SCRs then can
be fired during the positive half-cycle and the other can be fired during the negative
half-cycle.
In phase angle controllers, the SCRs conduct during all or part of every half-cycle.
When delivering full power, the SCRs start conducting at the beginnings of the AC
half-cycles. When delivering less than maximum power, the gating signal is de-layed
so the SCRs start conducting some time later than the beginnings of the half-cycles.
Operation of a phase angle controller at partial output is depicted in figure 4-4.
INPUT LINE VOLTAGE
FIRING
CIRCUITRY
CONTROL SIGNAL
GATING SIGNAL
OUTPUT LINE VOLTAGE
SCR 1
GATING SIGNAL
SCR 2
SCR 1
SCR 2
- Model 930 1
- Power Control System 1
- Instruction Manual 1
- Terry Nigon 2
- President 2
- Research Inc 2
- Model 930 ControlIR 3
- MAINTENANCE AND 4
- TROUBLE SHOOTING 4
- DIMENSIONS AND 4
- SPECIFICATIONS 4
- Introduction 5
- OPTIONAL 6
- FEATURES 6
- Page 3 of 25 7
- Installation 8
- CONTROL 10
- CONNECTIONS 10
- Page 8 of 25 12
- Remote Setpoint Input 12
- Operating Instructions 14
- 7 8 9 10 15
- TEMPERATURE 16
- CONTROL OPTION 16
- THEORY OF 16
- OPERATION 16
- Page 13 of 25 17
- Principles of Phase Angle 17
- Control 17
- Page 14 of 25 18
- Page 15 of 25 19
- Maintenance and 20
- Trouble Shooting 20
- CALIBRATION 21
- LINE VOLTAGE 23
- Dimensions and 24
- Specifications 24
- Page 21 of 25 25
- Wiring Specifications 25
- Specifications for Options 26
- DIMENSIONS 26
- Page 23 of 25 27
- Page 24 of 25 28
- Ordering Information 28
- Ordering Example 28
- Page 25 of 25 29
- Spare and Replacement Parts 29
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