MAGIC II
Training Guide – 11/14
Page 4
OTHER ZERO ADJUSTMENTS
Make a Zero Adjustment when a
series of lab results
shows a consistent error in the
same direction with system in automatic.
•
Consistency error
greater
than 0.5% adjust Thermacoil.
•
Consistency error
less
than 0.5% shift LRV/URV with the Hart.
MAGIC
is reading high, ADD the error to the LRV & URV.
MAGIC
is reading low, SUBTRACT the error from the LRV & URV.
After the First Zero Adjustment, output adjustments should be one half the error
shown between the labs and the meter.
TROUBLE SHOOTING TIPS
Constant error between
MAGIC
and labs
Check coil voltage setting
*
– if okay refer to
Ouput Adjustments to change zero
Varying error with
changes in consistency
Refer to Output Adjustments to change
sensitivity with the Curve Number
MAGIC
output does
not change
*
Voltage can vary
+/- .05 VDC.
Verify that breather plug on damper has
been removed
Verify that shipping brace has been
removed
Examine area around torque arm and
motor for objects obstructing free
movement
Disconnect loop power for a few seconds to
reset micro. Check power supply for a min
of 16VDC @ 20mA output
Verify that the Box and Coil are working by
pushing the torque arm to simulate the full
range of output.
LRV and URV Change EXAMPLE
MAGIC
= 3.5 % Con.; Labs Av. = 3.7 % Con.; Error = -0.2%
MAGIC
is reading low, so subtract error from LRV and URV
LRV
= 2 % - Adjust to 1.8%
URV
= 5 % - Adjust to 4.8%
Output at the Control Room will go up .2% to a 3.7% Con. output.
