Power Controllers
G3PX
87
CT Unit
The CT Unit varies with the G3PX-series model. Use the following
CT Units in combination with the G3PX models.
G3PX-2
@
0EH Series: G32X-CT
@@
G3PX-2
@
0EHN Series: G32X-CT
@@
HN
G3PX-2
@
0EC Series: G32X-CT
@@
C
If any of the following models is used and the actual load current is
50% of the maximum rated load current or lower, increase the
number of turns of the wire around the CT Unit.
G3PX-20EHN Series (multi-heater open circuit detective models)
G3PX-20EC Series (constant current)
For example, make two turns if the actual load current is 50% of the
maximum rated load current and four turns if the actual load current
is 25% of the maximum rated load current.
If the G3PX is a constant current model, do not increase the number
of turns of the wire around the CT Unit excessively, otherwise the
overcurrent detective function may operate by mistake.
External DUTY Adjuster
Use the External DUTY Adjuster with a resistance of 2 k
Ω
or that
with a resistance of 3 k
Ω
according to the G3PX-series model in use.
Refer to the following combinations.
G3PX-2
@
EH Series: G32X-V3K (3 k
Ω
)
G3PX-2
@
0EUN Series
G3PX-2
@
0EC Series
Base-up Function
If the model in use has the model number suffix “EUN,” the base-up
function is available.
The base-up output of the G3PX with a temperature controller output
of 0 mA (i.e., the temperature controller is turned off) and that of the
G3PX with a temperature controller output of 4 mA are different from
each other.
Power Device Cartridge
Do not apply power to the G3PX with the Power Device Cartridge
dismounted.
Heater Open Circuit Detection
EH and EHN Models
The heater open circuit detective function is not available for detect-
ing the phase less than the following.
Power Supply
Single-phase Models Only
Do not apply 200 V to the 100-V terminals, otherwise the thermal
fuse of the built-in transformer will be blown and the G3PX will not
operate.
Others
It is not possible to use three single-phase models for three-phase
load control.
If three-phase power supply is used for single-phase models
operating in parallel, make sure that the two phases supplied to all
the single-phase models are the same.
Troubleshooting
Check the following if the G3PX does not operate or has difficulty in
temperature control.
• The load does not turn on with 100% input.
Check the default internal ramp setting.
Also check the current limit adjuster if the G3PX is a constant DC
model.
• The G3PX does not operate or is in abnormal operation.
Make sure that all input terminals are connected properly with no
mistakes in polarity.
Make sure that the internal DUTY adjuster is not set to the farthest
clockwise position.
Make sure that the frequency used by the G3PX (i.e., 50 or 60 Hz)
is set properly. (This applies to the EC, and EHN models.)
• The G3PX malfunctions if the external adjusters are turned.
Make sure that the numbers on the external adjusters coincide with
the corresponding terminal numbers on the G3PX.
Make sure that the 2-k
Ω
and 3-k
Ω
DUTY adjusters are connected
correctly.
• Temperature control with a Voltage-output Temperature Controller
is not smooth.
Make sure that the controlled soft-start up/down time has been
adjusted properly. If not, turn the TIME adjuster counterclockwise
to the minimum setting to reduce the controlled start-up/down time.
G3PX-20EH Series:
π
/8 or less
G3PX-20EHN Series: Approx.
π
/6 or less
Phase not detectable
DUTY
Make sure that the adjuster
is set to the farthest
clockwise position.
CUR LIM
External main setting
External duty setting
(Positive)
(Positive)
Note: 1, 2, 3, 5, 6, and 7 are terminal numbers
of the G3PX.
TIME
TIME
Input signal
Reduce this period.
Input signal
Controlled
soft-start
up
Controlled
soft-start
up
