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15. Characteristics
15-1. Current capacity and heat value
Voltage drop to thyristor device (0.9
–
1.3 V) is produced by current flowing to the thyristor. Voltage between thyristor device and accumulation of
current (W) turn into Joule heat, resulting in rise in temperature of the thyristor device. Take heat dissipation and ventilation into account.
Internal heat value (Conversion formula for calorific value : 860kcal = 1000W)
Current capacity
20A
30A
45A
60A
80A
100A
Heat value
22W
36W
47W
65W
77W
96W
15-2. Ambient temperature, elevation and load current
15-3. Features and output waveform of control type
The device includes phase control and cycle calculation zero voltage switching control types. You can have the control type changed by specifying
when ordering. You can set it by key sequence
‘
2-5. Control type.
’
Features and output waveform of phase control and cycle calculation zero voltage switching control are as follows:
Phase control
Cycle calculation zero voltage switching control
100%
output
80%
output
50%
output
20%
output
100%
ON
80%
ON
ON
OFF
OFF
50%
OFF
ON
OFF
ON
20%
ON
OFF
OFF
ON
Control type
Output
Phase control
Cycle calculation zero voltage
switching control
Harmonics disturbance
Possibility of occurring
No
Flicker
No
Possibility of occurring
Applicable load
Resistance load
Inductive load (transformer primary control)
Resistance load
Power factor
Poor
Good
Features
Smooth, thorough control
No harmonic noise produced
Rated current of the device assumes an environment where ambient temperature does not rise above 55°C. If ambient temperature
exceeds 50°C, reduce load current as shown in the figure.
Ambient temperature (
䉝
)
Load
current
(%)
Ambient temperature /
load current characteristics
-10
0
50 55
100
90
Elevation (m)
Load
current
(%)
Elevation / load current characteristics
0
2000
100
80
500
