5. TROUBLESHOOTING
See table below.
D. FEEDBACK POTENTIOMETER OPTIONS
The M.A.S. can accept a potentiometer option designed to provide
feedback representing the position of the M.A.S. shaft.
• Single 0-1000 ohm potentiometer - output
• Voltage limit of pot is 30 volts maximum.
1. ASSEMBLY (Refer to Figure 20 below)
P – SINGLE POTENTIOMETER
a. With the potentiometer (item 3) mounted to the
potentiometer bracket (item 4) and the pinion gear (item
1) loosely fitted to the potentiometer shaft (item 2),
mount the potentiometer bracket (item 4), if not already
mounted, to the baseplate (item 5) using two #8-32 x "
screws (item 10) provided.
b. Remove the upper snap ring (item 6) from the shaft (item
7). Use care to avoid deforming it permanently.
c. Slide the face gear (item 8) onto the shaft, teeth facing
down, and secure with the snap ring (item 9) provided.
NOTE: The face gear utilizes a friction fit to the shaft. For
best results, wipe off any lubricant that may be on the
shaft before sliding on the face gear.
CAUTION: Do not overstretch the snap ring — use the
minimum opening to allow it to slip over the gear.
d. Replace the upper snap ring (item 6).
2. WIRING
NOTE: All wiring is to be run smoothly and neatly and away
from any rotating parts, using wire ties if necessary. Use
caution to avoid pinching wires and/or solenoid rectifiers
between the base and cover flanges.
a. Add the second terminal strip in the “secondary” location
using the four (4) #4 x " self-tapping screws provided.
Refer to figure 21.
b. Connect the wires to the end terminal strip as shown in
the wiring diagram on the next page.
NOTE: Wiring should be inserted only to mid-point of
terminal strip.
3. CALIBRATION FOR “P” (SINGLE POTENTIOMETER) OPTION
Prior to adjusting the potentiometer, the M.A.S. package must
be mounted to the actuator, and the baseplate must be
installed in the M.A.S. unit. Adjust the potentiometer pinion
gear so that there is approximately " tooth engagement
between the face gear and the pinion gear, and tighten the set
screw. The actuator must be in the full closed position prior to
Flow Control Division
Worcester Controls
12 Intrinsically Safe Modular Accessory System (Series I90) WCAIM2033
PROBLEM POSSIBLE CAUSE(S) SOLUTION
Switches do not indicate Improper cam settings Reset cams.
at proper positions
Switch does not actuate Switch too far from cam Loosen the adjustment plate screws and
(never trips) rotate switches toward shaft until actuation
is correct; retighten screws.
Switch does not reset Switch too close to cam Loosen the adjustment plate screws and
(always tripped) rotate switches away from shaft until
actuation is correct; retighten screws.
No indication at Broken, defective, or misplaced wire Check wiring with appropriate wiring
terminal strip diagram per Section III.C.3.
Cams not aligned with Cams/spacers in wrong order Check and reassemble cams per Section
switch arms III.C.2.
Cams not pushed into place Push cams into proper locations; align with
switch arms.
Figure 20
(8 Seiten)
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