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Operating Instructions

Safety Relay ESM-BL2..

Correct use

The ESM-BL2.. is a low-cost emergency stop safety 

relay with which machines and systems can be 

safely switched off by disconnecting the power 

supply. Internal error 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 installations.
Before the device is used, a risk assessment must 

be performed on the machine, e.g. according to the 

following standards:

 

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EN ISO 13849-1

 

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EN ISO 12100

 

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IEC 62061.

Correct use includes observing the relevant require-

ments for installation and operation, particularly 

based on the following standards:

 

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EN ISO 13849-1

 

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EN 60204-1

 

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IEC 62061.

Important!

 

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The user is responsible for the integration of 

the device in a safe overall system. For this 

purpose, the overall system must be validated, 

e.g. according to EN ISO 13849-2.

 

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The device user must assess and document 

remaining risks.

 

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If a data sheet is included with the product, the 

information on the data sheet applies.

Safety precautions

 WARNING

 

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Installation and setup of the device must be 

performed only by authorized personnel.

 

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Observe the country-specific regulations when 

installing the device.

 

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The electrical connection of the device is only 

allowed to be made with the device isolated.

 

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The wiring of the device must comply with the 

instructions in these operating instructions, 

otherwise there is a risk that the safety function 

will be lost.

 

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It is not allowed to open the device, tamper with 

the device or bypass the safety devices.

 

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All relevant safety regulations and standards are 

to be observed.

 

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The overall concept of the control system in 

which the device is incorporated must be vali-

dated by the user.

 

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Failure to observe the safety regulations can re-

sult in death, severe injuries and serious damage.

 

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Note down the version of the device (see type la-

bel 

Vx.x.x

) and check it each time prior to setup. 

If the version changes, the use of the device in 

the overall application must be validated again.

Features

 

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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 contac-

tors or expansion modules

 

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Cyclical monitoring of the output contacts

 

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Indication of the switching state via LED

 

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2 starting behaviors possible:
- Manual start
- Automatic start

 

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Short circuit and ground fault monitoring

 

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Up to PL d, SILCL 2, category 3

Function

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 logic system closes the safety contacts 

when the start button is pressed.
When the safety switch is opened, the positively 

driven safety contacts open and safely switch off 

the machine. 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. The switch must be checked 

regularly as part of a maintenance plan.

Fig. 1:  Block diagram for ESM-BL2..

Mounting

As per EN 60204-1, the device is intended for in-

stallation in control cabinets with a minimum degree 

of protection of IP54. It is mounted on a 35 mm 

mounting rail according to DIN EN 60715 TH35.

Fig. 2:  Mounting/removing

Electrical connection

 

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When the 24 V version is used, a safety transform-

er 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 safety contacts must be 

provided.

 

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A maximum length of the control lines of 1,000 m 

with a conductor cross-section of 0.75 mm² must 

not be exceeded.

 

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The conductor cross-section must not exceed 

2.5 mm².

 

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If the device does not function after setup, it must 

be returned to the manufacturer unopened. Open-

ing the device will void the warranty.

A1

Power supply

A2

Power supply

S11

DC 24 V control voltage

S21

Control line

13-14

Safety contact 1

23-24

Safety contact 2

Fig. 3:  Connections

Setup procedure

Notice

The items listed under 

Electrical connection

 must 

be observed during setup.

1. Wiring emergency stop circuit:

Wire the emergency stop circuit according to the 

required Performance Level determined (see Fig. 

5 to Fig. 7).

2. Wiring start circuit:

Wire the start circuit according to Fig. 8 or Fig. 9 to 

set the starting behavior.

Attention: 

If 

Automatic start

 is set, bear in mind that 

the safety contacts will switch immediately after the 

power supply is connected. If 

Monitored 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. 10 or Fig. 11.

4. Wiring power supply:

Connect the power supply to terminals 

A1

 and 

A2

 

(see Fig. 12).

Attention:

 Wiring only in de-energized state.

5. Starting the device:

Switch the operating voltage on.

Attention:

 If the 

Automatic start

 behavior is set, the 

safety contacts will close immediately.
If the 

Monitored manual start

 behavior is set, close 

the start button to close the safety contacts.
LEDs 

K1

 and 

K2

 illuminate.

6. Activating safety function:

Open the emergency stop circuit by actuating the 

connected safety switch. The safety contacts open 

immediately.

7. Reactivating:

Close the emergency stop circuit. If 

Automatic 

start

 is selected, the safety contacts will close 

immediately.
If the 

Monitored manual start

 behavior is set, close 

the start button to close the safety contacts.

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