172-65169MA-08 (MC-COS Multi-control Valve) 28 May 2010
31
6. Check to see whether the proper line voltage and control signals are being input to
the terminals in the drive section terminal box. With the proper wiring, the values
should be within the following ranges:
• Line voltage (between terminals 1 and
2): If the value is outside the range of
90 - 264 V AC, enter the proper line
voltage.
• Control signal (between terminals 4
and 5): 0.8 – 5.2 V DC.
Note: When the control signal from the
controller is:
0% – the value should be
50% – the value should be
100% – the value should be
Points in between those above will vary proportionally.
If the value is outside this range, check for disconnected wiring or controller
malfunction. If the voltage is correct but the drive section does still not rotate, there
may be a malfunction in the drive unit. Refer to “Drive Section Troubleshooting”
and take appropriate measures.
7. Turn OFF the power to the drive section.
8. Using a wrench, turn the adjustment
screw slowly. Be careful not to apply
excessive force.
9. If the adjustment screw cannot be turned
by hand or if it requires more than 10
N
w
m (7 lbf
w
ft) torque to do so, contact a
TLV serviceperson.
10. Check to make sure that the secondary
steam pressure increases when, as seen
from above, the adjustment screw has
been turned clockwise.
11. Check to make sure that the secondary
steam pressure decreases when, as
seen from above, the adjustment screw
has been turned counterclockwise.
12. If the secondary steam pressure does not change in steps 10. and 11. above, see
the
Pressure Reducing Valve Troubleshooting
section.
MC-COS
Terminal
Box
Drive Section
Terminal Block
SC-F70/SP-F70
Power Supply
100 - 240 V
Shielded Cable
Clockwise
–
Pressure
Increases
Counterclockwise
–
Pressure
Decreases
approx. 1 V DC
approx. 3 V DC
approx. 5 V DC
