Flowserve TRS5-7 User Manual

TRS 5 -7

Installation Instructions 810718-00

Temperature Switch TRS 5-7

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1

Content

Page

Important Notes

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

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

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

Explanatory Notes

Scope of supply ..............................................................................................................7

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

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

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

Technical data .................................................................................................................9

Installation

TRS 5-7b ......................................................................................................................10

TRS 5-7c/d ...................................................................................................................10

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

Wiring

TRS 5-7b, TRS 5-7c/d..................................................................................................11

Setting temperature limit

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

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

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

Commissioning

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

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

Test functions ................................................................................................................13

Annex

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

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

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

2

Wiring Diagram

9 9

Fig. 1

8

TRS 5-7b

LN

10

Thermocouple
TRG 5-11
TRG 5-31
TRG 5-41

Fig. 2

C28

L

A28

10

C30

N

A30

Thermocouple
TRG 5-11
TRG 5-31
TRG 5-41

TRS 5-7c/d

A18

A22

A20

C10
A10
C12
A12
C18
A 18
C14
A 14
C16
A 16
C12
A 12

C18

C22

C20

9

8

9

3

Parts Drawings

A

5

Fig. 3 Fig. 4

1

2

3

6

4

B

95

158

37.5

C F

75

120

ED

5

Fig. 5 Fig. 6

4

Parts Drawings

G

1

5

2

7

3

128.5

7

4

12 TE*)

*) TE = division units (1 TE = 5.08 mm)

Fig. 8Fig. 7

H

36

Fig. 9

52

5

Key

A

Cover screw

B

Hole for wall mounting

C

Cable entry

D

Base

E

Cover

F

Mounting clip

G

Fixing screws for 19" slide-in unit

H

Thermocouple TRG 5-11, TRG 5-31, TRG 5-41

1

Toggle switch “Test 2/Inspection”

2

LED “Alarm”

3

Button “Test 1”

4

LED “Operation”

5

LED “Temperature value”

6

Code switch for TRS 5-7b

7

Code switch for TRS 5-7 c/d (19" version)

8

External wire link

9

Burner-protection circuit

10

Mains

6

Important Notes

Usage for the intended purpose

The temperature switch TRS 5-7 is a safety equipment for plants requiring official
approval and must only be used in conjunction with thermocouples TRG 5-11,
TRG 5-31 and TRG 5-41 for 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 strips of the TRS 5-7 b and TRS 5-7c/d are live during
operation. This presents the danger of electric shock. Cut off power
supply before installing or removing the cover.

Explanatory Notes

Scope of supply
TRS 5-7b

1 Temperature switch (plug-in unit in plastic case for installation in control cabinets)
1 Installation manual

TRS 5-7c

1 Temperature switch (19" slide-in unit, front panel acc. to DIN 41494, part 5, 12 TE*)
2 Guide rails
1 Screw-type connector
1 Installation manual

TRS 5-7d

1 Temperature switch (19" slide-in unit, front panel acc. to DIN 41494, part 5, 12 TE*)
1 Installation manual

*) TE = division units (1 TE = 5.08 mm)

7

Explanatory Notes – continued –

Description

Self-monitoring temperature switch with periodic self-checking feature to be used in
conjunction with thermocouples type TRG 5-11, TRG 5-31, TRG 5-41.
The equipment operates as a safety temperature controller, or, in conjunction with an
external lock-out in accordance with VDE 0116, as a safety temperature limiter. An
alarm is given as soon as the temperature exceeds a preset limit value.
Application in steam boilers and (pressurized) hot-water plants operating without
constant supervision (TRD 604) as well as any other kind of heat generating units.

Function

The temperature switch type TRS 5-7 is a two channel unit featuring automatic self­checking in accordance with DIN 3440/VDE 0116 (regulations on protection circuits
for firing equipment of furnaces). The two channels are designed to monitor the
operation of each other. If one channel fails, an alarm signal is initiated,
simultaneously switching the output contacts to shut off the heat supply. The periodic
self-checking logic unit checks the two channel circuits for malfunction. The integrity
of the thermocouple is continuously monitored by the TRS 5-7. The output relays are
not influenced by this internal test.

A manual test push button is also provided. When the push button
a fault is simulated in the temperature sensor. There is also a toggle switch

INSPECTION for simulating a malfunction in the self-checking unit.

The output contact relays of the temperature switch are of the normally closed type
and will therefore signal alarm condition in the event of a mains failure.

The temperature switch can signal the following three operating conditions:

■

Normal operation (temperature within permissible range)

■

Alarm (limit temperature exceeded)

■

Alarm (malfunction in temperature switch or resistance thermometer)

The green LED indicates “

POWER ON”. The two red LEDs indicate excessive

temperature or system malfunction. The failure of one channel (loss of redundancy)
is signalled by the lighting-up of one red LED.
The equipment combination TRS 5-7 and TRG 5-... provides fail-safe protection
against a first fault, i. e. the system will still continue to provide the safety function
even after the occurence of a first fault.

TEST 1 is pressed,

TEST 2 /

Design
TRS 5-7b:

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.

TRS 5-7c:

19" slide-in unit, front panel to DIN 41494, part 5, 12 TE*)

*) TE = division units (1 TE = 5.08 mm)

8

Explanatory Notes – continued –

Technical Data
Type approval

DIN · STW (STB) · 986 98S

Input

2 connections for one twin-thermocouple (type K):
TRG 5-..., 1 – 170 bar, T

Output

2 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 at cos ϕ 0.5.
Max. contact rating with a switching voltage of 24 V d. c.: 4 A
Contact material silver, hard-gold plated.

Temperature range

0 – 1000°C, code switch selectable in steps of 5 °C

Switching hysteresis

–10°C

Indicators and adjustors

Two LEDs “Alarm”, one LED “Operation”, one push button “Test 1”, one toggle switch
“Test 2/Inspection”, eight LEDs and one code switch for temperature limit settings.

Accuracy

Better –19 Kelvin

Supply voltage

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

Power consumption

5 V A

Protection

TRS 5-7b: IP 20 to DIN EN 60529
TRS 5-7c: IP 10
TRS 5-7d: IP 10

Max. admissible ambient temperature

TRS 5-7b: 0°C to 55°C
TRS 5-7c: 0°C to 70°C
TRS 5-7d: 0°C to 70°C

Case material

TRS 5-7b:
Base: ABS plastic, black. Cover: polystyrene, highly shock resistant, stone grey.

Fig. 5, Fig. 6

TRS 5-7c: Front panel: Aluminium. Fig. 7
TRS 5-7d: Front panel: Aluminium. Fig. 7

Weight

TRS 5-7b: approx. 1.0 kg
TRS 5-7c: approx. 0.8 kg
TRS 5-7d: approx. 0.8 kg

650°C – 1000°C

max

9

Installation

TRS 5-7b
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.

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

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

TRS 5-7c

1. Mount plastic card guide rail into 19" magazine.

2. Install screw-type connector.

3. Introduce 19" slide-in unit into magazine and fasten with screws .

TRS 5-7d

1. Mount plastic card guide rail into 19" magazine.

2. Install screw-type connector.

3. Introduce 19" slide-in unit into magazine and fasten with screws .

A E

C

A E D

F

D

G

G

Tools

■

Screwdriver (5.5/100)

10

Wiring

TRS 5-7b

Use screened two-core supply cable for wiring, 2 x 0.35², type K. Max. cable length
100 m. Each temperature switch requires two cables.
The external wire link must be installed afterwards.

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

TRS 5-7c/d

Use screened two-core supply cable for wiring, 2 x 0.35², type K. Max. cable length
100 m. Each temperature switch requires two cables.
The external wire link must be installed afterwards.

1. Connect terminal strip according to wiring diagram. Fig. 2

Wiring diagram
For wiring diagram see 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 [11] and [14] (TRS 5-7b) or terminal
A18 and C18 (TRS 5-7c/d) of the temperature switch.

■

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.

8

8

Tool

■

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

11

Adjust MAX/MIN T emperature Limits

Use the code switch at the rear of the TRS 5-7 to adjust the temperature limits.

Example 1

τ

Requested temperature limit
between “5” and “640”. Use a small screwdriver to set the “10”, “20” and “80” and
“640” switches to the right. The sum of the values gives the required temperature
limit

τ

= 750°C

max

Example 2

Requested temperature limit
“80” and “320” switches to the right. The sum of the values gives the required
temperature limit

τ

max

= 420°C.

Example 3

Requested temperature limit
“20”, “40” and “80” switches to the right. The sum of the values gives the required
temperature limit

τ

= 145°C. An exact adjustment of 146°C is not possible as

max

temperatures limits can only be adjusted in steps of 5°C.

Tool

■

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

= 750°C. The 8-pole code switch shows values

max

τ

= 420°C. Use a small screwdriver to set the “20”,

max

τ

= 146 °C. Use a small screwdriver to set the “5”,

max

Commissioning

Check wiring

Check whether the TRS 5-7 has been wired to its associated system components
TRG 5-... according to the wiring diagram. Fig. 1, Fig. 2 and Fig. 9.

Apply mains voltage

Switch on mains voltage. The green LED will be illuminated. Fig. 3, Fig. 7

12

4

Commissioning – continued –

Check functions
TRS 5-7b, TRS 5-7c/d

1. When switching on the mains voltage the green LED should be permanently

4

illuminated. Fig. 3

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

3. After lowering the temperature the two red LEDs must extinguish.

2

2

4. An alarm “limit temperature exceeded” can be simulated by pushing the button

3

TEST 1 . On pushing the button the two red LEDs must light up.

5. To check the function of the self-checking circuitry of the temperature switch
proceed as follows: Set switch

TEST 2/INSPECTION in the direction of the arrow.

After a maximum of two minutes the two red LEDs should signal alarm. The
button

3

TEST 1 must not be operated during this test nor must the adjusted limit

1

2

temperature be exceeded. After the sucessful testing return switch into its original
position. After the response delay the two red LEDs must extinguish.

Annex

Warning

The terminal strips of the TRS 5-7b/TRS 5-7c/d are 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:

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

4

supply.

Remedy:
Remedy:

Fault:
Remedy:

Check whether thermocouple supply cable is damaged.
Check whether measured values emitted by thermocouple are correct.

The testing with push button TEST 2 / INSPECTION was not successful,
i. e. only one or neither of the red LEDs lit up within two minutes.

1

2

Replace temperature switch.

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 5-7b and TRS 5-7c/d conform to the
following Euopean 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 EN 50 081-2, EN 50 082-2

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

Bremen,12th June 2001

GESTRA GmbH

Head of the Design Dept.

Uwe Bledschun

Academically qualified engineer

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

Quality Assurance Representative

Lars Bohl

Academically qualified engineer

14

Example of Installation

E

F D

C

I

Fig. 11

Fig. 12

A

B

B

15

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810718-00/802c · ©1997 GESTRA GmbH · Bremen · Printed in Germany

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