VSI 1010-X - Page 15

SERIES 1000-X ELECTRIC ACTUATORS
15 VER: 0812-1
ADJUSTMENT OF ACTUATOR - MODULATING
• DB SWITCH – Allows for the selecon of dead band on the potenometer. Sengs are 1-10 which correspond to 0.5% to
5.0%.
• L1 LAMP – Green LED is the power indicator and illuminates when power is applied to terminals “N” and “L” of the Servo-
Control Pack.
• L2 LAMP – Red LED shows a malfuncon of the control signal input and illuminates when the control signal is lost or weak.
• L3 LAMP – Red LED shows a malfuncon of the posioning circuit and illuminates when the potenometer lead is open,
shorted or damaged.
• L4 LAMP – Red LED shows an over-torque condion illuminates if the valve is jammed or binding and the actuator’s torque
is exceeded.
5. Seng of Servo-Control Pack (SF-ZB and SF-LB)
• SERVO-CONTROL PACK POSTION LIMITS ARE FACTORY SET – UNLESS A CHANGE IN LIMIT SETTING IS DESIRED – NO
ADJUSTMENT SHOULD BE NECESSARY.
1. For the SF-ZB (1005S-X Models Only) Servo-Control Pack, there are two models – SF-ZB2 (2-10VDC) and SF-ZB4 (4-20mA).
The SF-LB Servo-Control Pack has a switch seng SC SWITCH which allows the user to select the control signal. For the following
procedure, select the proper control signal for the unit being adjusted.
2. Using a small screwdriver, rotate the Switch SA to “2” – this is the set mode. All sengs of the actuator can be adjusted in
the set mode.
3. FULL CLOSED POSITION LIMIT SETTING – Perform steps 1-2 above - Adjust the posion of the valve to the full closed
posion using the OPEN and/or SHUT buons. While pressing and holding the SET buon, press the SHUT buon and hold
both buons down for 4 seconds L2 LAMP will illuminate and then exnguish – release both buons at the same me. Closed
posion of the valve is now set.
4. FULL OPEN POSITION LIMIT SETTING – Perform steps 1-2 above - For Full Open limit seng the control signal must be
applied – 20mA or 10VDC depending on SC SWITCH seng. Adjust the posion of the valve to the full open posion using the
OPEN and/or SHUT buons. While pressing and holding the SET buon, press the SHUT buon and hold both buons down
for 4 seconds L2 LAMP will illuminate and then exnguish – release both buons at the same me. Open posion of the valve is
now set.
• CONTROL SIGNAL LOSS FAILURE MODE – If the control signal is lost, the actuator can be set to rotate the valve to a
predetermined state – FAIL OPEN, FAIL IN PLACE, FAIL CLOSED. Set SWITCH SB to 1 for open, 2 for in place and 3 for closed.
Factory set to 2. Note: Varying the selecon on SWITCH SB will be eecve even when the actuator is in full automac mode.
• DIRECT ACTING vs. REVERSE ACTING OPERATION – SWITCH SA is used for controlling the travel direcon of the actuator.
Actuators are factory set for direct acng (2-10V, 2V is closed and 10V is open and for 4-20mA, 4mA is closed and 20mA is open)
set SW A to 1 (direct acng). If reverse acng is desired (2-10V, 10V is closed and 2V is open and for 4-20mA, 20mA is closed and
4mA is open) set SW A to 3 (reverse acng).
• DEAD BAND SETTING – The dead band seng is used to adjust the actuators sensivity to the input control signal. The
lower the dead band seng, the more movement will occur in the actuator based on the resoluon of the control signal. Servo
Control packs are factory set to a midrange sensivity of around 3%. If less sensivity is desired, the DB SWITCH can be rotated
clockwise up to 5%. If more sensivity is desired, the DB SWITCH can be rotated counter-clockwise down to 0.5%.
5. TESTING – Set SW SA to 1 or 3 depending on the direct or reverse acng designaon. Apply the input signal to the Servo
Control Pack – verify the output signal corresponds to the input signal per the chart below.
TEST POINT INPUT SIGNAL
4mA or 2V 8mA or 4V 12mA or 6V 16mA or 8V 20mA or 10V
SCALE POINTER CLOSED “0” 2.5 5 7.5 OPEN “0”
VALVE POSITION 0% OPEN 25% OPEN 50% OPEN 75% OPEN 100% OPEN
OUTPUT CURRENT 4mA 8mA 12mA 16mA 20mA
Note: When SW SA is poinng towards posion 3 (reverse acng), the input signal of 2V or 4mA corresponds to the valve being 100%
open. The feedback reading will correspond to 100% open – 20mA.