CVA‑V●OPERATION MANUAL FOR PISTON TYPE VACUUM SWITCH●Read the instruction manual without fail before using the CVA‑DN and keep the manual with care.

CAUTION
1. This is not of a waterproof/oilproof type. Never use this switch in a place exposed to water and oil.
2. Remarks on electric current and voltagea)Be sure to confirm load current/voltage because there is great difference in opening‑and‑closing cabability of a contact point
between direct current and alternating current.
b)Use this switch permissible inrush current valve due to the reason that there is great difference between reguler current value
and inrush current value.
3. As for technical specifications and external view, please refer to catalog.

Adujsting method for setting Vacuum Degree●Adujsting method for setting Vacuum Degree○Since vacuum degree is already set at ‑46.6kPa, adjust other vacuum degreein accordance with following procedure. (Setting Range:‑33.3 to ‑73.2kPa)
1. Connect Pad B same size as Pad A to vacuum gauge(SG‑4) as shown in thediagram on the right side. Make sure that the gauge indicates zero.
2. Make CONVUM ready to generate vacuum through putting together Pad A and Pad B
connected with the vacuum gauge. Then, adjust air supply pressure for CONVUM
by the filter regulator and make the vacuum degree coincide with theindicator of vacuum gauge.
3. Loosen the fixing hexagonal nut of vacuum switch.
4. Connect the tester(ohm range, etc.) to the lead wires. (Adjust the tester toohm range, etc. for electric conduction check.)
5. Turn the adjusting screw of vacuum switch counterclockwise until the limit.
(When turning the adjusting screw counterclockwise, vacuum degree approaches
to atomospheric pressure and when turning clockwise, it approaches toabsolute pressure.)
6. Turn the adjusting screw of vacuum switch clockwise and slowly until thetester indicates electric conduction on the tester.
7. Tighten the fixing hexagonal nut of vacuum switch.
8. Setting is completed by above 7 procedures. Confirm the operation undervacuum degree newly set. To confirm setting, decrease the pressure of filter
regulator and then gradually increase the pressure little by little and thevacuum degree which the tester indicates electric conduction is set‑degree.
If the vacuum degree exceeds the set‑degree, follow again procedure above 2to 7 since the tightening of the screw adjusting of above 7th procedure iswrongly done.
9. Return the air supply pressure to the suitable usage pressure for CONVUM
after finishing all the setting procedures.

⑤⑥①②③④Adjusting Hexagonal Nut
Knob for Adjustment ofVacuum Degree①CVA CONVUM②Pressure Gauge（SG‑4）③Vacuum Pad A④Vacuum Pad B⑤Filter Regulator⑥Compressor

HOW TO MOUNTHOW TO MOUNT CVA‑V ONTO CVA CONVUM

IN CASE OF USING CVA‑V AS SINGLE UNIT
●Be sure to check whether seal washer is fixed with small
hollow screw not cause air leakage.
●The plug shall be removed for piping.

CVA‑VPlug

Seal washer

CVA CONVUM
Seal Washer
Small Hollow Screw(M3×4)
Standard Bolting Torque
0.59N･mHollow Screw(2‑M3×25)
Standard Bolting Torque
0.59N･m

EXTERNAL VIEW
④⑤③

⑥⑦⑧②

①⑨⑯⑮

●Discription①
CVA‑V Main Body
②Plug
③Trimming Plate④
Hollow Screw（M3×10）⑤Switch Assembly⑥Spring Pin⑦Fixing Hexagonal Nut⑧
Adjusting Screw of Vacuum Switch⑨
Hollow Screw（M3×5）⑩
Spring Ａ⑪Stopper⑫
Piston⑬
Spring Ｂ⑭
Spring Ｃ⑮
Hollow Screw（M3×4）⑯
Seal Washer

CAUTION* Be sure to cut power supply and air supply whendisassembly or replacement of parts is made.
* Disassembly and assembly must be carried out by aperson having professional knowledge/skill.
* On assembly and disassembly, glasses must be wornfor body protection.

⑪
⑭
⑬

⑩⑫

http://www.convum.co.jp
MANUAL NO.CVAVE‑0405‑①