Precision-control-systems 930 Manual do Utilizador descarregar pdf (Página 18)

Model 930 ControlIR

Instruction Manual Operating Instructions

Research, Inc. Page 14 of 25

90° PHASE ANGLE

360° 270° 180° 90° 360° 270° 180° 90° 0°

MEDIUM POWER

OUTPUT

135° PHASE ANGLE

360° 270° 180° 90° 360° 270° 180° 90° 0°

LOW POWER

OUTPUT

45° PHASE ANGLE

360° 270° 180° 90° 360° 270° 180° 90° 0°

HIGH POWER

OUTPUT

AC PHASE ANGLE

AC LINE VOLTAGE

OUTPUT VOLTAGE TO LOAD

Figure 4-5 Phase angle power

control

The average power a phase angle controller delivers to its load is determined by the

number of electrical degrees by which the gating signal that turns on the SCRs is

delayed past the beginnings of the half-cycles. The later in each half-cycle the SCRs

fire, the less the time the SCRs conduct during each half-cycle and, therefore, the less

power is delivered to the load (see figure 4-5). The 0–5 VDC control signal received

by the phase angle firing-circuit determines the amount by which the gating signal is

delayed.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 28 29

Sem comentários

Precision-control-systems 930 Manual do Utilizador Página 18