Warner Electric MCS-208 - Manual (Page 14)

14 Warner Electric • 800-825-9050 P-276 • 819-9045
Table 1
Y min (Min. transducer input).
Y max. (Max. transducer input).
P max (max. pressure, brake-on mode
P sup (supply pressure)
* For current transducers this value is given in maDC.
For voltage transducers this value is given in VDC.
** If shop air does not maintain 80 psi minimum, then P
max should be set lower. P max should be at least
5 psi lower than the minimum supply pressure, P sup.
 a. With control power off, set the meter
to measure MCS-207 control output
to the transducer.
 b. Apply power to the system.
 c. Place the Brake-Off switch in the
brake-off mode.
 d. Set the zero potentiometer on the
control output/driver board to Y min.
(Refer to Table 1). Rotate the zero
potentiometer CW to increase and
CCW to decrease the output.
 e. Return the Brake-Off switch to the
normal run mode.
 f. Set the Brake-On switch to the
brake-on mode.
 g. Using the span potentiometer on the
control output/driver board to equal
Y max. Rotate the span pot CW to
increase and CCW to decrease the
output.
 h. Return the Brake-On switch to the
normal run mode.
 i. Repeat steps c-h to make sure the
zero and span potentiometers are
properly set. There is some
interaction between these two
potentiometers.
 7. Transducer Calibration
NoTe: For transducers that are pre-calibrated for
0-75 psi, calibration is not generally required. If the
transducer is labeled as calibrated for 0-75 psi and is
mounted vertically, proceed to Step 8. Otherwise
proceed with the following calibration procedure. The
zero and span potentiometers are identified on the
outside of the transducer. Use care when adjusting
these potentiometers.
 a. Place the Brake-Off switch in the
brake-off mode.
 b. If the pressure reads above 0 psig,
turn the zero pot on the transducer
CCW until the pressure just reaches
zero.
 c. If the pressure reads 0 psig, turn the
zero pot CW until the pressure rises
above zero. Then slowly turn the pot
CCW until the pressure just reaches
zero.
 d. Return the Brake-Off switch to its
normal run mode.
 e. Turn on the Brake-On switch and
adjust the pressure to 75 psi. Turn
the span CW to increase pressure
and CCW to decrease pressure.
 f. Repeat steps a through e to make
sure the span and zero pots are
properly set.
 8. Remove air pressure from the system.
 9. Disconnect the pressure gage.
 10. Connect the brake line to the transducer
output.
NoTe: If it is preferred to leave the pressure gage in the
system, a “T” fitting can be used.
 11. Apply air pressure to the system.
C. Start-Up and Dynamic Adjustments
 1. Verify that power is on.
 2. Start the machine and draw material.
 3. After the Dancer has stabilized, adjust the
front panel “Dancer Position” potentiometer
for the desired dancer running position.
 4. If the system is providing stable dancer
operation, increase the “Gain” until the
dancer hunts or oscillates. Note the gain
position number where this occurs.
 5. Reduce the “gain” setting from Step 4
above one or two digits from where
instability or oscillation occurs.
 6. If dancer instability is apparent from initial
start, reduce the gain until it becomes
stable.
Y min* 1 4 10 1 1
Y max* 5 20 50 5 9
P max**(Psi) 75 75 75 75 75
P sup** (Psi) 80 80 80 80 80
Adjustment Transducer Range
Variable 1-5(ma-DC) 4-20(ma-DC) 10-50(ma DC) 1-5(VDC) 1-9(VDC)