DART Controls 250G CONTROL Serie Manual De Instrucciones página 10

Setting the Min, Max and Linearity Trimpots.
1. Preset the multi-turn Linearity trimpot on the –5 option board full CW, set the Min trimpot full CCW and set the Max trimpot
at about 50% rotation.
2. Input a 4 ma. current signal to the control and turn the Min trimpot CW to your desired minimum output voltage or to deadband
(the point just before you begin to get an output).
3. Input a 20 ma. current signal to the control and set the Max trimpot to the desired maximum speed setting.
4. With 20 ma. still going to the control, turn the Linearity trimpot CCW until your output speed starts to decrease. Then slowly
turn it back CW until you just reach your maximum speed setting.
• For enclosed models use -7 option.
Note: This jumper wire is not used with some options. Consult factory if more than one option is being wired. Using the JU2
jumper wire when not required may cause permanent damage to the control.
-7 option
Isolated 4-20 ma. Signal Follower
with Auto/Manual Switch
Input impedance: 500 ohms or
less
LINEARITY ADJUSTMENT
CURRENT
SOURCE
Permits the control to
follow a 4mA to 20mA
grounded or
ungrounded current
4 to 20mA ........... -7
DO NOT USE TRIMPOT CHART TO ADJUST MIN AND MAX TRIMPOTS ON MAIN BOARD. IF ADJUSTMENT IS NEED THEN
REFER TO THE SETUP PROCEDURE BELOW.
This option allows the control to be run in either the Manual mode via a speed pot or the Auto mode via the 4-20 ma.
signal. The current signal input can be either grounded or ungrounded. The board sets on spacers screwed to terminals P1-
1, P1-2, and P1-3 on the main board using long screws. The current source connects to the + and - two position terminal strip
(P16-1 and -2) on the -7 option board.
This option includes a Balance trimpot which is used to scale the maximum speed in the manual mode. It is factory
set so the maximum speed in manual equals the maximum speed in automatic.
The Linearity trimpot on the -7 option board is set at the factory for proper linearity, however this trimpot may need to
be re-set after tuning the Max and Min trimpot settings on the control or if the Balance trimpot on the –7 must be reset for your
specific application. If needed then refer to the setup procedure below.
Setting the Min, Max, Balance and Linearity Trimpots.
1. Preset the multi-turn Linearity trimpot and the Balance trimpot on the –7 option board full CW, set the Min trimpot full CCW
and set the Max trimpot at about 50% rotation.
2. Input a 4 ma. current signal to the control and turn the Min trimpot CW to your desired minimum output voltage or to deadband
(the point just before you begin to get an output).
3. Input a 20 ma. current signal to the control and set the Max trimpot to the desired maximum speed setting.
4. Switch the control to the Manual mode setting and adjust the Balance trimpot CCW as needed to attain your required manual
mode maximum output speed. (Adjustable form 50 to 100% of maximum Auto mode setting)
5. Switch the control back to Auto mode. With 20 ma. still going to the control, turn the Linearity trimpot CCW until your
output speed starts to decrease. Then slowly turn it back CW until you just reach your maximum speed setting.
* Note: This jumper wire is not used with some options. Consult factory if more than one option is being wired. Using the JU2 jumper
wire when not required may cause permanent damage to the control.
-9 option
Special Cover Assembly
NEMA 4/12 enclosure kit without cover mounted on-off switch and speedpot.
BALANCE
ADJUSTMENT
P16
-1 -2
250/500
- - - -4 -5 -6 -7
(250G TERMINAL STRIP)
from P1-2 of 250G
WHITE
Enclosed - Factory Installed only
Chassis - Factory or Field Installed
Chassis - switch & wiring are customer provided
RED
3PDT
SWITCH
AC AC
-8 -9 -10 -11 P1
YELLOW
HI
SPEEDPOT RED
ORANGE
LO
9
AUTO
MANUAL
Factory Installed Only
Enclosed Models Only