IMR01M01-E16
17
7. FUNCTIONS
7.1 Selecting Manual Mode Type and Input Signal Monitor 1
Displays one of the following values depending on the Control mode and the setting of Contact input action selection.
• Input signal from controller
• External manual set value (Input signal from external manual setter)
• Internal manual set value
, input signal from controller is always displayed on Input signal monitor 1 when the Contact input function is not used.
(The displayed item on Input signal monitor 1)
Contact input
action selection
State of external contact
Contact closed
(Manual mode)
Contact open
(Auto mode)
0: External manual mode
↔ Auto mode
External manual set value Input signal from controller
1: Internal manual mode
↔ Auto mode
Internal manual set value Input signal from controller
2: Internal manual mode
(fixed)
Internal manual set value
Select Manual mode type
Example: Select Manual mode with Internal manual set value.
1. Go to the parameter “Contact input action” in Parameter group 1.
Set it to “1: Internal manual mode ↔ Auto mode.”
2. The input signal from controller is displayed when the contact is open.
The Internal manual set value is displayed when the contact is closed.
7.2 Control Method
Phase control
Phase control is to continuously control electric power supplied to a load by
changing phase angle
θ
of AC voltage applied to the load. Each half-cycle has
ON and OFF time.
Zero-cross control (Continuous)
Continuous Zero-cross control is to control electric power supplied to a load by
turning the power supply voltage ON and OFF at the point of 0 V AC so that
the high frequency noise can be suppressed compared with Phase control.
This on and off time is typically measured in milliseconds.
50 %
Zero-cross control (Input synchronous type)
Input Synchronous type Zero-cross control is to turn the power supply ON and
OFF synchronously with the pulse signal from a controller.
This on and off time is typically measured in seconds.
Input
signal
OFF OFF ON
7.3 Ramp Function (Soft-Start/Soft-Down Function)
Soft-start/Soft-down function gradually ramps up/down the output voltage to the demand level over the set time to prevent a
sudden change in load or voltage.
The Soft-start/Soft-down time sets a period of time from 0 to 100 % or 100 to 0 %.
100%
Output voltage
Soft-start time
→ Time
→
Time
Input signal
and setting
Soft-down time
100%
Output voltage
→ Time
→
Time
80%
Output limiter (high limit)
0% 0%
Soft-start time Soft-down time
Input signal
and setting
Soft-start/Soft-down action diagram
If a load generating large rush current is used, thyristor break-down may occur when no Soft-start time is
appropriately set.
In Zero-cross control, no rush current can be suppressed even if the Soft-start time is set.
Contact input
closed
(Manual mode)
THV-1
Contact input action
selection
J.8.8.1.
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