EUCHNER ESM-BL2 Series Operating Instructions

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:
EN ISO 13849-1
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EN ISO 12100
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IEC 62061.
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Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
EN ISO 13849-1
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EN 60204-1
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IEC 62061.
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Important!
The user is responsible for the integration of
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the device in a safe overall system. For this
purpose, the overall system must be validated,
e.g. according to EN ISO 13849-2.
The device user must assess and document
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remaining risks.
If a data sheet is included with the product, the
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information on the data sheet applies.

Safety precautions

WARNING
Installation and setup of the device must be
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performed only by authorized personnel.
Observe the country-specific regulations when
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installing the device.
The electrical connection of the device is only
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allowed to be made with the device isolated.
The wiring of the device must comply with the
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instructions in these operating instructions,
otherwise there is a risk that the safety function
will be lost.
It is not allowed to open the device, tamper with
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the device or bypass the safety devices.
All relevant safety regulations and standards are
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to be observed.
The overall concept of the control system in
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which the device is incorporated must be vali-
dated by the user.
Failure to observe the safety regulations can re-
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sult in death, severe injuries and serious damage.
Note down the version of the device (see type la-
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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

2 safe, redundant relay outputs
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Connection of:
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- Emergency stop buttons
- Safety switches
- Non-contact safety switches
Single- and dual-channel operation possible
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Feedback Loop for monitoring downstream contac-
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tors or expansion modules
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:
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- Manual start
- Automatic start
Short circuit and ground fault monitoring
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Up to PL d, SILCL 2, category 3
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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

When the 24 V version is used, a safety transform-
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er according to EN 61558-2-6 or a power supply
unit with electrical isolation from the mains must
be connected.
External fusing of the safety contacts must be
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provided.
A maximum length of the control lines of 1,000 m
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with a conductor cross-section of 0.75 mm² must
not be exceeded.
The conductor cross-section must not exceed
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2.5 mm².
If the device does not function after setup, it must
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be returned to the manufacturer unopened. Open-
ing the device will void the warranty.
1
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.