Instruction Manual
ITEM TE700
TECNA
S.p.A.
116/128
11.2
- INTERFACE FOR PROPORTIONAL VALVE
This interface board, code 50220, permits the control unit to control a proportional valve and
set the welding pressure in bars as one of the program's parameters. This interface requires
external power supply. The 12-pole terminal board permits the connection of the proportional
valve, the control unit and the interface power supply.
TERMINAL BOARD CONNECTIONS
64
EV+ from the control unit (PIN 46)
65
EV- from the control unit (PIN 45)
66 24Vac
67 24Vac
68 Ground
69 OUT-I
70
0-10Vdc to the proportional EV
71
+24Vdc to the proportional EV
72
Ground to the proportional EV
73 ALARM-IN
74
ALARM1 (PIN 33- AUX3)
75
ALARM2 (PIN 34- COM1)
Program the voltage control range of the proportional valve directly via the weld control unit.
The
FEATURES
TE700
menu contains the PRESSURE RATIO parameter with which to
select the most suitable
bar/Volt
ratio for the type of solenoid valve that is to be used.
Example:
Pressure Parameter bar
PRESSURE RATIO
Parameter (bar/Volt)
Output Volt
5.0 1.0
5
5.0 2.0
10
5.0 0.5
2.5
CONNECTIONS DIAGRAM:
N.B.
_ The board is fitted with a red LED, indicated by acronym D10 (adjacent to the relay), which
indicates when +24VDC is present (Pin 71) and leads to the proportional valve. If the LED is
off when power is ON, the operator must check for the correct 24VAC (Pin 66 and Pin 67) and
ground (Pin 68) connections.
_ The board is also fitted with a small trimmer, for adjusting the full scale of the output in
voltage (Pin 70). This adjustment is carried out when tested and therefore MUST NEVER be
moved away from its natural position so as not to alter the signal in the output.