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.
Drive Section Terminal Block
MC-COSR
Terminal Box
Shielded Cable
Power Supply
100 - 240 V AC
approx. 1 V DC
approx. 3 V DC
approx. 5 V DC
Controller Terminal Block
SC-F70/SP-F70
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.
172-65185A-08 (MC-COSR Multi-control Valve) 20 Nov 2014
9. If the adjustment screw cannot be turned
by hand or if it requires more than 10
N
m (7 lbf
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.
Counterclockwise
–
Pressure
Decreases
Clockwise
–
Pressure
Increases
12. If the secondary steam pressure does not change in steps 10. and 11. above, see
the
Pressure Reducing Valve Troubleshooting
section.
