© 2013
PAGE 11
WTC3293
www.teamwavelength.com
WTC3293-00400-I
APPLICATION NOTES
Changing the PGAIN to a Fixed Value
Once the system is optimized, connect an
ohmmeter to TP 5 & 6, without the WTC3243
installed.
Measure the PGAIN trimpot value across
pins TP 5 & 6.
Remove P2.
Load P1 with a resistor of the value measured
(1206 size).
Increasing Proportional Gain Range
Change P2 to a 100 k
Ω
resistor for
P
MAX
= 75 A / V.
Remove P2 (in
fi
nite resistance) for
P
MAX
= 100 A / V.
Changing the I TERM to a Fixed Value
Once the system is optimized, connect an
ohmmeter to TP 6 & 7, without the WTC3243
installed.
Measure the I TERM trimpot value across
pins TP 6 & 7.
Remove I2.
Load I1 with a resistor of the value measured
(1206 size).
Changing LIM to a Fixed Value
Connect an ohmmeter to TP 1 & 3, without
the WTC3243 installed.
Measure the LIMA trimpot value across pins
TP 1 & 3.
Remove LA2.
Load LA1 with a
fi
xed value to match the
trimpot resistance at the proper limit setting
(1206 size).
Repeat with LB2 and LB1 and TP 4 & 1,
respectively.
Changing Onboard Setpoint Trimpot to a
Fixed Resistance
Remove ST3 and ST4. Load ST1 and ST2
such that:
Setpoint = 2.5 * ST2
ST1 + ST2
ST1 + ST2 must be greater than 5 k
Ω
.
Setpoint is in volts.
ST1 and ST2 are in ohms (1206 size).
BOTTOM VIEW
TRIMPOT LOCATIONS
TOP VIEW
TEST POINT LOCATIONS
BOTTOM VIEW
TRIMPOT LOCATIONS
TOP VIEW
TEST POINT LOCATIONS
TOP VIEW -- TEST POINT LOCATIONS
BOTTOM VIEW -- TRIMPOT LOCATIONS
Figure 11 PGAIN Settings
Figure 12 I Term Settings
Figure 13 LIMA & LIMB Settings
Figure 14 Onboard Setpoint Settings
