Flowserve TRS 5-8 User Manual

TRS 5-8

Installation Instructions 810709-01

Temperature Switch TRS 5-8

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1

Contents

Page

Important Notes

Usage for the intended purpose ...................................................................................... 7

Safety note ......................................................................................................................7

Danger ............................................................................................................................ 7

Explanatory Notes

Scope of supply ..............................................................................................................8

Description ......................................................................................................................8

Function .......................................................................................................................... 8

Design .............................................................................................................................8

Technical Data.................................................................................................................9

Installation

TRS 5-8b ...................................................................................................................... 10

Examples of installation ................................................................................................ 15

Wiring

TRS 5-8b ...................................................................................................................... 11

Setting temperature limit

Example 1 .....................................................................................................................12

Example 2 .....................................................................................................................12

Example 3 .....................................................................................................................12

Commissioning

Check wiring..................................................................................................................12

Apply mains voltage ......................................................................................................12

Performance test ...........................................................................................................13

Annex

Danger ..........................................................................................................................13

Fault finding list .............................................................................................................13

Declaration of conformity .............................................................................................. 14

2

Wiring Diagram

TRS 5-8 b

°C

MAX

6 8

L N

7

Fig. 1

°C

MIN

Pt 100
DIN IEC 751

TRG 5-53
TRG 5-54
TRG 5-55
TRG 5-56
TRG 5-57
TRG 5-58

3

Parts Drawings

2
4
8
16
32
64
128
256

2
4
8
16
32
64
128
256

°C

°C

A

MAX

MIN

Fig. 2

A

B

85

112

C

F

32

51

Fig. 3 Fig. 4

107

ED

3

4

Parts Drawings

Fig. 5

2
4

°C

8

MAX

5

4

16
32
64
128
256

2
4
8
16
32
64

°C

MIN

128
256

1

2

3

G

red

Fig. 6

10 12

11

ϑ

white

10 1211

H

yellow

red

Fig. 7

ϑ

black

white

ϑ

5

Key

A

Cover screw

B

Hole for wall mounting

C

Cable entry

D

Base

E

Cover

F

Mounting clip

G

Resistance thermometer TRG 5-53, TRG 5-55, TRG 5-57 (1 x Pt 100)

Resistance thermometer TRG 5-54, TRG 5-56, TRG 5-58 (2 x Pt 100)

H

1

LED “High temperature limit”

2

LED “Low temperature limit”

3

LED “Operation”

4

Code switch for low temperature setting

5

Code switch for high temperature setting

6

Switching relay for high temperature

7

Mains

8

Switching relay for low temperature

6

Important Notes

Usage for the intended purpose

The temperature switch TRS 5-8 must only be used in conjunction with resistance
thermometers TRG 5-53, TRG 5-54, TRG 5-55, TRG 5-56, TRG 5-57 and TRG 5-58
for monitoring and signalling temperature limits.

Safety Note

The equipment must only be installed by qualified staff.
Qualified staff are those persons who – through adequate training in electrical

engineering, the use and application of safety equipment in accordance with
regulations concerning electrical safety systems, and first aid & accident
prevention – have achieved a recognised level of competence appropriate to the
installation and commissioning of this device.

Danger

The terminal strip of the TRS 5-8 b is live during operation. This presents
the danger of electric shock. Cut off power supply before installing or
removing the cover.

7

Explanatory Notes

Scope of supply

TRS 5-8 b

1 Temperature switch (plug-in unit in plastic case for installation in control

cabinets)

1 Installation manual

Description

MAX/MIN temperature switch TRS 5-8 used in conjunction with resistance

The
thermometer TRG 5-53, TRG 5-54, TRG 5-55, TRG 5-56, TRG 5-57, TRG 5-58 is a
temperature controller in accordance with DIN 3440.

When the actual value exceeds the adjusted limit the equipment will trigger an alarm.
Application in steam boilers, pressurized hot-water plants operating without constant

supervision (TRD 604) as well as any other kind of heat generating unit.

Function

The temperature switch TRS 5-8 is a two-channel temperature monitoring system
used in conjunction with a standardized platinum resistance thermometer Pt 100 in
accordance with DIN IEC 751. A power source fitted with a variable resistor supplies
the resistance thermometer with a constant current. The desired cut-off
temperatures are adjusted by means of an eight-pole code switch. To ensure a fail­safe alarm signal as soon as the temperature exceeds the max. limit the output
contact relays of the TRS 5-8 are of the normally closed type.
In the event of a power supply failure the temperature switch will signal an alarm
condition.

The temperature switch is designed for two operating conditions:

■ Normal operation (temperature within admissible range)

■ Alarm (temperature above/below limit)

The green LED indicates power supply. The two red LEDs indicate alarm when the
temperature exceeds the adjusted limit.

Design

TRS 5-8b:

Plug-in unit in plastic case for snapping onto the supporting rail TS 35 x 15 to DIN
EN 50022 for installation in control cabinets.

8

Explanatory Notes – continued –

Technical Data

Type approval no.

DIN TW 1068 2000

Input

Connection for resistance thermometer Pt 100:
TRG 5-5..., PN 40-160, T

Output

Two volt-free relay contacts. Max. contact rating with switching voltages of 24 V,
115 V and 230 V a. c.: 4 A resistive, 0.75 A inductive, cos
Max. contact rating with a switching voltage of 24 V d. c.: 4 A
Contact material: silver, hard-gold plated.

Temperature limit range

Code-switch selectable in steps of 2°C within a range of 30°C to 540°C.

Switching hysteresis

At

MAX limit: –5 °C

At

MIN limit: 5°C

Indicators and adjustors

Two LEDs “Alarm”, one LED “Power supply”,
one code switch for “

MIN temperature”, one code switch for “MAX temperature”.

Mains supply

230 V +/– 10 %, 50/60 Hz.
Special voltage 115 V +/– 10 %, 50/60 Hz or 24 V +/– 10 %, 50/60 Hz.

251°C – 540°C

max

ϕ 0.5.

Power consumption

5 VA

Protection

TRS 5-8 b:
IP 20 to DIN EN 60529

Admissible ambient temperature

0 °C to 55 °C

Case materials

TRS 5-8b:
Base: ABS plastic, black
Cover: polystyrene, highly shock resistant, stone grey, Fig. 3, Fig. 4

Weight

approx. 0.6 kg

9

Installation

TRS 5-8b

On supporting rail (with mounting clip)

1. Clip temperature switch onto supporting rail.

2. Loosen cover screws and unplug cover from its base .

3. Select cable entry and remove corresponding seal.

C

On mounting panel

1. Loosen cover screws and unplug cover from its base .

2. Unscrew mounting clip .

3. Drill the hole marked in the base to 4.3 mm dia.

B

A E D

F

4. Fasten base with two M4 screws onto mounting panel.

Tool

■

Screwdriver (5.5/100)

E DA

10

Wiring

TRS 5-8 b

Use screened four-core supply cable for wiring, e. g. 2 x 2 x 0.8 mm or 4 x 0.5 mm

1. Connect terminal strip according to wiring diagram. Fig. 1

2. Connect additional display units to terminals marked in yellow and black of the

TRG 5-54, TRG 5-56 and TRG 5-58. Fig. 7

Wiring Diagram

See wiring diagram page 2.

Attention

■

To protect the switching contacts fuse circuit with T 2.5 A or according
to TRD regulations (1.0 A for 72 h operation).

■

The screen must not make any other electrical contact.

Note

■

Connect screen only to terminal [10] of the temperature switch.

■

The loop resistance must be lower than 10 Ω.

■

The rated voltage is stated on the name plate.

■

When switching off inductive loads, voltage spikes are produced that
may impair the operation of control and measuring systems. Inductive
loads should therefore be provided with commercial arc suppressor
RC combinations, e. g. 0.1 µF/100 Ω.

2

.

Tool

■

Screwdriver for slotted screws, size 2.5, completely insulated according to
VDE 0680.

11

Adjust MAX/MIN Temperature Limits

Use the two code switches at the rear of the TRS 5-8 to adjust the temperature limits,

Fig. 5.

Example 1

Requested temperature limit τ

= 176°C. The 8-pole code switch shows values

max

between “2” and “256”. The basic temperature is 30 °C. Set the “2”, “16” and “128”
switches to the left using a small screwdriver. The sum of the three values gives a
temperature of 146 °C, plus the basic temperature of 30°C. This corresponds to the
requested temperature limit τ

= 176°C.

max

Example 2

Requested temperature limit τ

= 446 °C. Set the “32”, “128” and “256” switches to

max

the left using a small screwdriver. The sum of the three values gives a temperature
of 416°C, plus the basic temperature of 30°C. This corresponds to the requested
limit temperature τ

= 446 °C.

max

Example 3

Requested temperature limit τ

= 79°C. Set the “16” and “32” switches to the left

min

using a small screwdriver. The sum of the two values gives a temperature of 48°C,
plus the basic temperature of 30°C. This corresponds to a limit temperature τ

min

=
78°C. An adjustment of exactly 79 °C is not possible as temperatures can only be
adjusted in steps of 2°C.

Tool

■

Screwdriver for slotted screws, size 2.5, completely insulated according to
VDE 0680.

Commissioning

Check wiring

Check whether the TRS 5-8 has been wired to its associated system components
TRG 5-... according to the wiring diagram. Fig. 1, Fig. 6 or Fig. 7.

Apply mains voltage

Switch on mains voltage. The green LED will be illuminated. Fig. 5

12

3

Commissioning – continued –

Check functions

TRS 5-8 b

1. When switching on the mains voltage the green LED should be permantently
illuminated. Fig. 3

2. Raise temperature in heat generator until the permissible temperature limit is
exceeded. The red LED on the temperature switch must light up.

3. After lowering the temperature the red LED must extinguish.

1

1

4. Lower the temperature until it falls below the min. temperature limit.
The red LED on the temperature switch must light up.

5. After raising the temperature the red LED must extinguish.

2

2

3

Annex

Warning

The terminal strip of the TRS 5-8b is live during operation. This presents
the danger of electric shock. Cut off power supply before fixing or removing
the cover.

Fault finding list

Fault:
Remedy:
Remedy:
Remedy:

The temperature switch signals alarm during normal operation.
Check whether the green LED is illuminated. If not, check power supply.

3

Check whether resistance thermometer supply cable is damaged.
Check whether measured values emitted by resistance thermometer
are correct (basic values of measuring resistors in accordance with
DIN 43760 for Pt 100).

If faults occur that are not listed above please contact our subsidiary or agency
in your country.

13

Annex – continued –

Declaration of Conformity

We hereby declare that the equipment TRS 5-8 b conforms to the following
European guidelines:

■

LVD 73/23/eec version 93/68/eec

■

EMC guideline 89/336/eec version 93/68/eec

which are based on the following harmonised standards:

■

LV standard EN 50 178

■

EMC standard DIN EN 61000-6-4, EN 50 082-2

This declaration is no longer valid if modifications are made to the equipment
without consultation with us.

Bremen, 15

GESTRA GmbH

Dr. Anno Krautwald

Key

A

Cover screw

Hole for wall mounting

B

Cable entry

C

D

Base

E

Cover

F

Fixing clip

I

Mounting rail TS 35 x 15 to DIN EN 50022

th

July 1997

Dr. Christian Politt

14

Example of Installation

E

2
4
8

°

C

MAX

16
32
64
128
256

2
4
8
16
32
64

°

C

MIN

128
256

F D

C

I

Fig. 8

Fig. 9

A

B

B

15

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A Unit of Flowserve Corporation

810709-01/1202c · © 1997 GESTRA GmbH · Bremen · Printed in Germany

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