Vi. options, Worcester actuation systems – Flowserve 36 Series Electric Actuator User Manual
Page 5
Flow Control
Worcester Actuation Systems
VI. OPTIONS
1. Extra Limit Switch Installation
A. The extra limit switch, M1, is different from the limit switch used
in the actuator for proper valve indexing. Tripping of the extra limit
switch is advanced due to a shorter lever arm on the switch.
B. Remove the actuator cover.
C. Remove the screws attaching the actuator’s limit switch to the
limit switch spacer.
D. Position the extra limit switch against the existing limit switch and
fix both switches to the spacer, use the longer screws provided
with the extra limit switch kit and reuse the existing lockwashers
(see Figure 2).
Check to make sure there is clearance between the extra limit
switch lever arm and the retaining shroud. If they are touching,
loosen the motor mounting screws and move retaining shroud
enough to clear the switch lever arm.
E. Three quick-connectors are provided for fixing external wiring to
this extra limit switch. Using the proper crimping tools, connect
field wiring to these connectors.
NOTE: The extra limit switch contact arm must lead (be shorter than)
the contact arm of the actuator operating switch, i.e., the auxilliary
switch must trip before the positioning switch.
F.
Adjust the limit switches as necessary to obtain the necessary
switch actuation through the extra limit switch’s three terminals
Common (c) Normally-Open (NO) Normally-Closed (NC)
These terminal designations are shown on the switch body.
With the switch lever arm up, the NO terminal becomes closed;
with the switch lever arm down the NO terminal is open.
G. Test the actuator and check continuity of the M1 switch. It must
trip before limit switch does.
H. With the switch properly adjusted, tighten all screws, tuck all
wiring away from any rotating parts and replace actuator cover.
Tighten each actuator cover screw insuring that cover to base seal
remains properly in position.
2. Auto Sequence Timer
A. GENERAL
The Worcester Actuation Systems Auto Sequence Timer is a solid
state electronic circuit board which is mounted inside the 36
actuator. It is available at 120 VAC standard. The timer allows the
actuator to periodically open and close a valve for various time
periods that are field-selectable. By simply opening or closing
switches on the timer’s circuit board, various open and closed
time periods can be selected.
B. TIME PERIODS
The following table shows the required switch position of the
several switches in a small switch package mounted on the board.
The first four switches, #1 through #4, control the open time,
while the second four switches, #5 through #8, control the closed
time.
Timer cycle operation is indicated by two board-mounted light
emitting diodes (LEDs). For current boards (identified by a label
containing the board part no. and revision letter), the lower LED
lights when the timer is in the short-time part of its cycle,
normally the open time period. The upper LED lights when the
timer is in the long-time part of its cycle, normally the closed time
period. The LEDs on older boards are reversed.
IMPORTANT - A minimum of one switch in the first four switches, #1
through #4, AND a minimum of one switch in the second four
switches, #5 through #8, MUST BE in the “ON” position for the auto
sequence timer to properly operate. (The “ON” position is marked on
the switch).
The open cycle selection is independent of the closed cycle selection;
“O” = Switch On, “X” = Switch Off.
OPEN CYCLE SWITCHES
CLOSED CYCLE SWITCHES
1
2
3
4
TIME IN SECONDS
1
2
3
4
TIME IN HOURS
O
X
X
X
6
O
X
X
X
.25
X
O
X
X
12
X
O
X
X
.50
O
O
X
X
18
O
O
X
X
.75
X
X
O
X
24
X
X
O
X
1.00
O
X
O
X
30
O
X
O
X
1.25
X
O
O
X
36
X
O
O
X
1.50
O
O
O
X
42
O
O
O
X
1.75
X
X
X
O
48
X
X
X
O
2.00
O
X
X
O
54
O
X
X
O
2.25
X
O
X
O
60
X
O
X
O
2.50
O
O
X
O
66
O
O
X
O
2.75
X
X
O
O
72
X
X
O
O
3.00
O
X
O
O
78
O
X
O
O
3.25
X
O
O
O
84
X
O
O
O
3.50
O
O
O
O
90
O
O
O
O
3.75
C. WIRING
The auto sequence timer is mounted into the actuator as shown
in Figure 4. Field wiring connects to the terminal block as shown
in the wiring diagram, Figure 3.
D. RESET SWITCH
Included with the auto sequence timer circuit board is a reset
switch that is mounted to the base of the actuator with a
waterproof boot. The switch, when pressed and held, will allow
the timer circuit to open the valve. (Hold down until the valve is
open! Leaving the valve partly open will stall the actuator.)
Releasing the button will automatically restart the sequence that
is selected on the circuit board’s time period selection switch,
starting with “on” time.