Bray 6P P_P Series - Manual (Page 12)

Adjustment – Poppet Seat
Balance Pressure A/M Adjustment
NOTICE
The Poppet Seat Adjuster is factory set and sealed
before the positioner is shipped. Do not adjust
Auto / Manual default setting (Automatic) as shown.
Troubleshooting
Positioner does not respond to the input signal
1. Check the supply pressure to the actuator. The
supply must be at least 40 psi / 2.7 Bar / 0.27 MPa
2. Check if input signal is properly supplied to the
positioner. The signal range should be 3-15 psi.
3. Check if the positioner’s nozzle (5) has been
blocked. If the nozzle has been blocked by any
substances, please contact your local
Bray distributor for a replacement.
4. Check if feedback shaft has been adjusted
properly and engaged to actuator pinion.
The pressure of OUT 1 reaches exhausting
pressure level and does not come back down
1. Check Auto/Manual (A/M) switch. For proper
operation it must be in the “A” position.
2. Check for a gap or damage between the nozzle
(5) and the flapper (13). If damaged, please con-
tact your local Bray distributor.
Hunting occurs
• Check if feedback springs (15) have been dis-
placed.
• Hunting may occur when the positioner is
attached to a very small capacity actuator (ex:
Bray Series 92/93 size 48). In such case, install
an output orifice for OUT 1 and OUT 2 per the
following steps.
1. Remove Pilot Valve Assembly (Figure 2).
2. Remove the O-ring from OUT 1 and OUT 2
port, install orifice in and reinstall the O-ring
to OUT 1 and OUT 2 again. When mounting
the output orifice, pay attention not to let dust
or debris enter the orifice (Figure 16).
3. If hunting does not stop after installing the
output orifice, please contact your local
Bray distributor.
Actuator only operates Open or Closed
1. Check tubing connection
2. Check cam direction
Linearity is too low
1. Check if Zero and Span has been properly adjusted.
2. Check if supply air pressure level is stable from
the regulator. If the level is unstable, replace the
regulator.
O-ring
Orifice Diameter
Orifice
OUT 1 OUT 2
O-ring
Orifice Diameter
Orifice
OUT 1 OUT 2
Bray ® is a registered trademark of BRAY INTERNATIONAL, Inc.
© 2013 Bray International. All rights reserved.
OM-6P-001 11-2013
A Division of BRAY INTERNATIONAL, Inc.
13333 Westland East Blvd. Houston, Texas 77041
281/894-5454 FAX 281/894-9499 www.bray.com
R
CONTROLS
Figure 15
Figure 14
A/M
Automatic/ Manual
Poppet Seal
Adjuster
A/M
A/M
Bray Series 6P
Operation and Maintenance Manual