Instruction Manual

Instruction Manual
D200129X012
2506/2516 Receiver/Controller
April 2014
20
These letters correspond to: direct (D), reverse (R), snap (S), and proportional (P) control action. To obtain the type of
control desired, position the switch plates so that the proper letter appears in the cut‐out corner, as explained below:
D The bellows assembly on the left provides either direct or reverse action. The receiver/controller (2506 or 2516) can
be changed between direct and reverse action by repositioning the switch plate (key 132) on the left. Direct action
(D) is when increasing transmitter input pressure increases receiver/controller output pressure. To obtain direct
action, position the switch plate so the D is visible. Reverse action (R) is when decreasing transmitter input pressure
increases receiver/controller output pressure. To obtain reverse action, position the switch plate so the R is visible.
D The bellows assembly on the right provides either proportional (P) or snap (S) action depending on the switch plate
position. For all types of receiver/controllers, to obtain proportional action, position the switch plate so the P is
visible. For 2506 receiver/controllers, to obtain snap action, position the switch plate so the S is visible.
Troubleshooting
As an aid to troubleshooting, see table 4 for a listing of some common operating faults, their probable cause, and
suggested procedures for correcting the faults.
Table 4.Troubleshooting Chart
Fault Possible Cause Check Correction
1. Process wanders or cycles
around set point.
Note: 1.2 is for the 2500 and
2506/16 combination.
1.1 Proportional band or specific
gravity adjustment incorrect, or
improperly tuned control loop.
1.1 Insure that the prestartup
procedures are completed correctly.
Tune control loop.
1.1 If stable control cannot be attained,
and all other elements are functionally
correct, examine other possible causes
related to the controller/transmitter.
1.2 Input signal varying to the
2506/16.
1.2 Use a pressure gauge to monitor
input stability.
1.2 Apply stable input pressure source.
Tune the 2500 controller/transmitter.
1.3 Supply pressure varying, or
incorrect supply pressure setting.
1.3 Use input pressure gauge to
monitor stability. Make sure regulator
supply pressure is within limits.
1.3 Apply correct supply pressure. It is
recommended to use one regulator per
instrument.
1.4 Relay malfunction. 1.4 Check for relay malfunction by
using the testing relay deadband
procedure.
1.4 Depress plunger to clean out the
fixed restriction. Replace relay using the
procedure in the maintenance section.
2. Receiver/controller
controlling off set point or
switching point.
2.1 Supply pressure not set
correctly.
2.1 Make sure regulator supply
pressure is set correctly. Make sure
regulator supply pressure is within
limits.
2.1 Reset the regulator pressure.
If the problem recurs, replace or rebuild
the regulator. Provide a regulator input
pressure within regulator limits.
2.2 Leak in the receiver/controller
loop.
2.2 Use soap and water to check for
internal and external leaks.
2.2 Replace or repair leaking parts as
necessary.
3. Receiver/controller cannot
obtain full output range.
3.1 Supply pressure not set
correctly.
3.1 Make sure supply pressure is set
correctly. Make sure regulator supply
pressure is within limits.
3.1 Reset the regulator pressure.
If problem recurs, replace or rebuild the
regulator. Provide a regulator input
pressure within regulator limits.
3.2 Nozzle adjustment. 3.2 Insure the nozzle is not loose. 3.2 Perform calibration procedures.
3.3 Relay malfunction. 3.3 Check for relay malfunction by
using the testing relay deadband
procedure.
3.3 Depress plunger to clean out the
fixed restriction. Replace relay using the
procedure in the maintenance section.
3.4 Leaking controller/transmitter
loop.
3.4 Use soap and water to check for
internal and external leaks.
3.4 Replace or repair leaking parts as
necessary.
-continued-