EUCHNER ESM-BL2xx User Manual

Emergency Stop Sa fety Relay E SM-BL2..

User Information

Correct Use

Features

Function

ESM-BL2.. is the low-cost emergency stop safety relay with which
machines and systems can be safely switched off by disconnect­ing the power supply. Internal fault monitoring takes place
during restarting via the start button.

Applications for the ESM-BL2.. include single or dual-channel
emergency stop circuits and guard monitoring on machines and
systems.

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2 safe, redundant relay outputs

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Connection of:

- Emergency stop buttons

- Safety switches

- Non-contact safety switches

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Single and dual-channel operation possible

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Feedback loop for monitoring downstream contactors or
expansion modules

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Cyclical monitoring of the output contacts

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Indication of the switching state via LED

The emergency stop safety switching device ESM-BL2.. is
designed for safe isolation of safety circuits according to
EN 60204-1 and can be used up to safety category 3, PL d
according to EN ISO 13849-1.

The internal logical system closes the safety contacts when
the start button is pressed.

When the safety switch is opened, the positively driven
safety contacts are opened and safely switch the machine
off. It is ensured that a single fault does not lead to a loss of
the safety function and that every internal fault is detected
by cyclical self-monitoring no later than when the system is
switched off and switched on again. Only a fault in the
safety switch itself is not detected. This must be checked
regularly as part of a maintenance plan.

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2 start behaviors possible:

- Manual start

- Automatic start

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Short circuit and earth fault monitoring

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Up to PL d, SILCL 2, category 3

Fig. 1 Block diagram ESM-BL2..

(not for plug-in terminals)

Installation

Safety
Precautions

Electrical
Connection

As per EN 60204-1, the device is intended for installation in
control cabinets with a minimum degree of protection of
IP54. It is mounted on a 35-mm DIN rail according to DIN
EN 60715 TH35.

•

Installation and commissioning of the device must be
performed only by authorized personnel.

•

Observe the country-specific regulations when installing
the device.

•

The electrical connection of the device is only allowed to
be made with the device isolated.

•

The wiring of the device must comply with the instruc­tions in this user information, otherwise there is a risk
that the safety function will be lost.

•

When the 24 V version is used, a safety transformer
according to EN 61558-2-6 or a power supply unit with
electrical isolation from the mains must be connected.

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External fusing of the contacts (4 A slow-blow or 6 A
quick-action or 10 A gG) must be provided.

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A maximum length of the control lines of 1000 meters
with a line cross section of 0.75 mm2 must not be ex­ceeded.

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The line cross section must not exceed 2.5 mm2.

•

If the device does not function after commissioning, it
must be returned to the manufacturer unopened. Open­ing the device will void the warranty.

Fig. 2 Installation / removal

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It is not allowed to open the device, tamper with the de­vice or bypass the safety devices.

•

All relevant safety regulations and standards are to be
observed.

•

The overall concept of the control system in which the
device is incorporated must be validated by the user.

•

Failure to observe the safety regulations can result in
death, serious injury and serious damage.

A1: Power supply
A2 : Power supply
S11: DC 24V control voltage
S21: Control line
13-14: Safety contact 1
23-24: Safety contact 2

Fig. 3 Connections

EUCHNER GmbH + Co. KG Kohlhammerstraße 16 D-70771 Leinfelden-Echterdingen Tel. [phone] Fax [phone] www.euchner.de [e-mail]

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Emergency Stop Sa fety Relay E SM-BL2..

User Information

Applications

Emergency Stop
Circuit

Starting Behavior

Depending on the application or the result of the risk assessment according to EN ISO 13849-1, the device must be wired as
shown in Fig. 1 to Fig. 9.

Fig. 1:

Two-channel emergency stop
circuit without fault monitoring of
the emergency stop button and
the supply cables.

(up to category 3, PL d)

Fig. 2:

Single-channel emergency stop
circuit without fault monitoring of
the emergency stop button and
the supply cables.

(up to category 1, PL c)

Fig. 3:

Two-channel sliding guard monitoring
with positively driven limit switches.

(up to category 3, PL d)

Notice:

In order to activate earth fault monitoring, S10 must be con­nected to PE (protective earth) on the AC115/230V devices.
With AC/DC 24 V, connect PE only to the power supply unit
according to EN60204-1.

Fig. 4:

Manual start.

Warning:

Safety contacts switch
immediately when the
power supply is connected.

Fig. 5:

Automatic start
(e.g. for applications with a

safety door).

Feedback Loop

Safety contacts

Commissioning
Procedure

Fig. 6:

Feedback loop for monitored manual
start:

The feedback loop monitors contactors
or the expansion modules .

Fig. 8:

Connecting load to safety contacts.

(Figure shows example.
Voltage „+V“ according to techn.

data)

Note: The items listed under “Electrical connection” must be observed during commissioning.

1. Wiring emergency stop circuit:

Wire the emergency stop circuit according to the required
Performance Level determined (see Fig. 1 to Fig. 3).

2. Wiring start circuit:

Wire the start circuit according to Fig. 4 or Fig. 5 to set the
starting behavior.

Warning:
If “Automatic start” is set, bear in mind that the safety con-

tacts will switch immediately after the power supply is
connected. If “Manual start” is set, the start button must be
opened after wiring.

3. Wiring feedback loop:

If your application provides for external contactors or ex­pansion modules, connect them to the device according to
Fig.6 or Fig.7.

4. Wiring power supply:
Connect the power supply to terminals A1 and A2.

5. Starting the device:

Switch the operating voltage on.

Warning:

If the “Automatic start” starting behavior is set, the safety
contacts will close immediately.

If the “Manual start” starting behavior is set, close the start
button to close the safety contacts.

LEDs K1 and K2 are lit.

6. Triggering safety function:

Open the emergency stop circuit by actuating the con­nected safety switch. The safety contacts open immedi­ately.

7. Reactivation:

Close the emergency stop circuit. If “Automatic start” is
selected, the safety contacts will close immediately.

If the “Monitored manual start” starting behavior is set, close
the start button to close the safety contacts.

Warning: Wiring only in de-energized state.

Fig. 7:

Feedback loop for automatic start:
The feedback loop monitors contac-

tors or the expansion modules .

EUCHNER GmbH + Co. KG Kohlhammerstraße 16 D-70771 Leinfelden-Echterdingen Tel. [phone] Fax [phone] www.euchner.de [e-mail]

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