Warner Electric MCS-208 - Manual (Page 20)

20 Warner Electric • 800-825-9050 P-276 • 819-9045
 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 Pmax. Turn the
span CW to increase pressure and
CCW to decrease pressure.
C. Input Calibration
NoTe: The following calibratin procedures assume that
the minimum input corresponds to zero output pressure
to the brake, and that the maximum input corresponds
to an output pressure of P cal to the brake. See Table 2,
for the values of P cal.
Follow the procedure below (1, 2, 3, 4 or 5) that applies
to the input mode selected: These adjustments should
be made with the Brake-Off and Brake-On switches in
the run mode.
 1. Local torque adjust mode
 a. Insure power is on and torque
adjust/span is set fully CCW.
 b. Set the “zero adjust” potentiometer
through the front panel so the
transducer output pressure is zero.
 c. Now rotate the front panel
torque/span potentiometer toward its
maximum setting. As the pot is
turned CW toward its maximum
position the control ouput will reach
P cal.
The ouput pressure should not
exceed P max. If it does, recheck
Brake-Off/Brake-On calibration,
Step 6.
NoTe: Steps a through c, above, may have to be
repeated to achieve full range adjustment of the
torque/span potentiometer.
 2. Remote torque adjust
 a. Insure that system power is on.
 b. Set the remote torque adjust
potentiometer to maximum.
 c. Set the front panel torque span
adjust for a transducer pressure
output of P cal.
 d. Set the remote torque adjust
potentiometer to minimum.
 e. Set the zero adjust potentiometer
through the front panel to obtain a
transducer pressure output of zero.
 f. Repeat steps b through e above as
these two adjustments will interact
with each other.
 g. After the proper span adjustment is
obtained, remove the torque span
knob and insert the cap plug into the
hole to prevent tampering.
 3. Current source adjust
 a. Insure that system power is on.
 b. Adjust the external current source for
minimum input current, based on the
operating range selected.
 c. Adjust the zero adjust potentiometer
through the front panel to obtain a
transducer output pressure of zero.
Do not turn potentiometer further
CCW than necessary to reach zero
pressure.
 d. Set the external current source to
maximum input based on the
operating range selected.
 e. Adjust the front panel torque span
potentiometer for a transducer
output pressure of P cal. Do not turn
potentiometer further CW than
necessary to reach P cal.
 f. Repeat steps b through e to insure
there is no interaction between
adjustments.
 g. After set-up has been completed, the
torque span knob should be removed
and the hole plugged with the insert
provided.
 4. Voltage source adjust
 a. Insure that the system power is on.