FujiFilm PXG4, Operation Manuals

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10
Chapter
HB Alarm Set Value ,
HB Alarm Hysteresis
This function controls whether the heater break alarm is
active. It is only available during ON/OFF (2 state)
control.
The heater break alarm includes the following settings:
The following connection diagram includes CT connections.
The relationship between the heater disconnect alarm
settings and hysteresis is shown below.
Heater break
Alarm Settings The electric current set value at which the alarm
trips.
• Range: 0.0A to 50.0A
Heater break
alarm
hysteresis The detection and recovery width of the heater
break alarm hysteresis.
• Range: 0.0A to 50.0A
power
control output
+ –
thermocouple
heater
current
sensor
* CT
magnet switch
MG
SW
electrical furnace
power AC100 to 240V 50/60Hz
5
6
11
12
3 4 35 36
PXG
CT1
heater current
ON
OFF
alarm output
t
heater break alarm
set value
set value
hysteresis
Point
• This is not used when the heater is controlled by
thyristor phase angle control.
• When the margin of error is large due to low heater
capacity, the problem is resolved by doubling the
current to increase the sensitivity. (Be sure to double
the setting value in such cases.)
• If there are multiple CTs, make sure to use the same
procedure for each of them.
• The heater break detector CT is connected as shown
below:
• The parameters to be set are "Hb 1" and "Hb 1h" for the
CT1 or CT2 terminal that is used.
• The heater break alarm is effective only for a single-
phase power supply. It cannot be used for a three-
phase power supply.
wrap
once wrap
twice
OK NG
OK
Connection to heater
(through the hole in the CT)
}
Connection to PXG
(no polarity)