19
OTHERS
Precautions in use
Use cables with sufficient capacity to the rated current of the unit, for wiring of the main circuit.
For wiring of the main circuit, connect a K terminal to the power supply side, and an L terminal to
the load side.
Securely align the phase of power supply for main circuit with the same for control circuit.
Do not bind cables for control circuit with those for main circuit.
In the case of low capacity load (approx. 10% of rated capacity or lower) , the “LOD” indicator lamp
may light up by self-diagnostic function, but this does not give any problem on operation.
When storing the unit in the cabinet, provide ventilation in consideration of the internal calorific
value by the unit.
(The internal calorific value is specified in the “External Dimensions of Unit” section.)
When the unit is operated in the cycle control, using a fuse-attached model of the unit is preferable.
In the case of low capacity load, a leakage current may be applied onto the load side, causing any
malfunction even if the signal is off.
So connect a bleeder resistor in parallel with the load. (The minimum load current is 1A or more.)
Be sure to attach the unit vertically and perpendicularly with an attachment space secured as
instructed in the “Precautions in Installation” . Attaching the unit in the horizontal direction or reduc-
ing the attachment space will adversely affect a cooling effect and abnormally increase the temper-
ature of the unit.
Attach the unit so that its front door can be opened and closed for maintenance or inspection.
Do not apply 5V or more, or 20mA or more from the temperature control unit.
In the case of inductive load (including transformer load), a voltage exceeding the rating may be
applied onto the load side of the unit caused by abnormal voltage due to oscillation under low load,
or by surge voltage due to gate block (including ON/OFF from the GT terminal) or service interrup-
tion under transformer load, and other reasons. Therefore, install a CR absorber on the load side of
the unit.
Current (A)
200V system unit
400V system unit
Capacitor (µF)
Resistor (
)
Capacitor (µF)
Resistor (
)
25-100
0.5 (AC400V)
50 (120W)
1 (AC800V)
50 (120W)
150-350
1 (AC400V)
20 (120W)
1 (AC800V)
20 (120W)
450
2 (AC400V)
20 (120W)
2 (AC800V)
20 (120W)
C
R
UF1 unit
Load
transformer
(including PT)
meter
Summary of Contents for CALPOTE UF-1 Series
Page 25: ...MEMO...
