Siemens RL 147 Installation Instructions Manual

RL 147 Positioning Relay Calibration

Product Description

This sheet provides the instructions to calibrate the
RL 147 Positioning Relay after it has been mounted
on an actuator.

Product Number

NOTE:

Installation Instructions

Document No. 129-125

Rev. 5, June, 2000

In some cases, the actuator stem travel or

stroke is not identical to the nominal value
of the relay feedback spring. See

Calculating The Span Setting

the span setting on the feedback arm.

to determine

147-2000

Required Tools

•

Medium flat-blade screwdriver

•

Tubing, pressure gauge, and squeeze bulb

(Part of Calibration kit 832-177)

•

Two 5/8-inch open end wrenches

•

Two 7/16-inch open end wrenches for valve

stems of 1/4-inch diameter

Expected Installation Time

10 Minutes

Prerequisites

•

For field installed relays, mount the

positioning relay on the actuator according
to the instructions that are packaged with
the mounting kit.

•

Check that you have the correct feedback

spring(s) attached.

−

If the positioning relay is mounted on a

valve, see

−

If the stroke of the No. 6 damper

actuator has been adjusted, see

Table 1

Identify the desired operating span and the start
point pressure.

Tables 4 and 6.

.

Installation

Setting the span

The positioning relay operating span can be set for
spans of 3 to 12 psig (21 to 83 kPa).

For spans of 3 through 10 psig (21 to 69 kPa)

1. Check that the feedback spring is attached to
the spring guide in the hole across from the
span adjustment screw. This is identified as the
standard location in

2. With a screwdriver, loosen the span adjustment

screw. Move the spring guide on the feedback
arm until the span adjustment tab is at the
desired span setting reference number.

NOTE:

3. Tighten the span adjustment screw.

4. The feedback spring must be parallel to the
actuator shaft or valve stem. Use the open end
wrenches to loosen the hex nuts holding the
spring arm in position on the shaft or stem.
Align the feedback spring and tighten the hex
nuts.

5. The feedback spring should have no slack or no
stretch in it. Adjust the wing nuts and
adjustment nut, if necessary.

The line to the left of the number is the
setting.

(See

Figure 1.

Figure 1

)

Page 1 of 5

Document No. 129-125
Installation Instructions
Rev. 5, June, 2000

Installation, Continued

Figure 1. Span Adjustment.

Shown at Span Setting 8.

For spans of 11 or 12 psig (76 or 83 kPa)

Figure 2. Start Point Adjustment

1. Move the span adjustment tab to the 10 setting
on the feedback arm. Follow steps 2 and 3 for

Setting the span

2. Move the feedback spring one hole away from
the standard location for a span of 11 psig
(76 kPa) and two holes away from the standard
spring location for a 12 psig (83 kPa) span. See

Figure 1

3. Follow steps 4 and 5 for

.

Adjusting the start point

The positioning relay can be adjusted to start
actuator movement at pressures between 3 and 10
psig (21 and 69 kPa).

1. Remove the relay cover.

2. Attach tubing with a pressure gauge and
squeeze bulb to the "T" port. Supply air should
be attached to the "S" port. The "M" port should
be attached to the connector on the actuator.

3. Using the squeeze bulb, apply pressure to the
relay. Watch the valve stem or actuator shaft to
see when it begins to move. Check the
pressure gauge; this is the start point pressure.

4. If this is not the desired start point pressure,
turn the start point adjustment nut (
clockwise to increase the start point pressure
and counterclockwise to decrease the pressure.

.

Setting the span

Figure 2

(see

.

Figure 2

)

)

Adjusting the span

1. Using the squeeze bulb, apply pressure to the
relay. Note the pressure at which the stem or
shaft begin to move.

2. Continue to apply pressure until the stem or
shaft completes its full stroke. Note the
pressure.

3. The difference between the two pressures is
the

span.

4. If the span is not the desired span, move the
spring guide to a higher reference number to
increase the span or lower number to decrease
the

span. See

5. Repeat steps 1 through 4 until you get the
desired

6.

If you have moved the spring guide, adjust the
spring arm so that the spring is parallel to the
stem or shaft.

7.

Check the feedback spring. There should be no
slack nor stretch in it. Adjust the wing nuts and
adjustment nut, if necessary.

8. Fasten the relay cover. Fill in the information on
the calibration label.

9. Attach the air line from the controller to the "T"
port.

Figure 1

span.

Setting the Span

and

.

5. Repeat steps 3 and 4 until the stem or shaft
begins to move at the desired pressure.

Page 2 of 5

Siemens Building Technologies, Inc.