EUCHNER ESM-ES3xx User Manual

Safety Expansion Cont act Block ESM-ES3..

User Information

Correct Use

Features

Function

The ESM-ES3.. contact block in combination with any basic device
from the EUCHNER ESM series can be used to produce up to three
additional safety contact paths per device. An existing system can
thus be expanded practically indefinitely in a modular manner.
Activation takes place via a safety contact of the basic device; the
ESM-ES3.. provides signaling contacts for fault monitoring. The
devices can be used in systems up to safety category 4, PL e.

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3 safe, redundant relay outputs
1 auxiliary contact (fault monitoring)

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Activation via basic device from the EUCHNER ESM
series

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Modular, freely configurable safety system

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Fault monitoring by basic device

The safety expansion contact block ESM-ES3.. in combina­tion with a basic device from the EUCHNER ESM series is
designed for safe isolation of safety circuits according to
EN 60204-1 and can be used up to safety category 4, PL e
according to EN ISO 13849-1.

Terminal S11 (DC 24V control voltage) is connected with
terminals S15 and S16 via the safety contacts of the basic
device. Starting the basic device also activates the ESM­ES3.. . The basic device disconnects the control voltage
when the safety switch is operated, and the safety contacts
of the ESM-ES3.. open immediately.

If a fault occurs in the ESM-ES3.. , this is detected by the
basic device via terminals S23 and S24.

Independent operation without basic device is not
possible.

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Earth fault monitoring

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Indication of the switching state via LED

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Up to PL e, SILCL 3, category 4

Fig. 1 Block diagram ESM-ES3..

(not for plug-in termnals)

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.

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Installation and commissioning 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 this user information, otherwise there is a risk
that the safety function will be lost.

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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 safety 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.

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

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PE (protective earth) must be connected to terminal S10
on the AC 115/230V variant. Wiring of the overall device
is to be designed for 115/230V.

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.

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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 validated by the user.

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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
S10: control line
S15: control line
S16: control line
S23: Fault monitoring
S24: Fault monitoring
13-14: Safety contact 1
23-24: Safety contact 2
33-34: Safety contact 3

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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Safety Expansion Cont act Block ESM-ES3..

User Information

Applications

Wiring

Depending on the application, the device must be wired with a EUCHNER basic device as shown in Fig. 1 to Fig. 2. If the
devices are wired inside a control cabinet (minimum degree of protection IP54), the fault involving a short circuit between the
activation lines can be ruled out (protected wiring space). Category 4, PL e according to EN ISO 13849-1 is thereby possible.

If this fault cannot be ruled out, category 3, PL e is achieved.

Fig. 1: Connection of ESM-ES3.. to basic device

Wiring of the ESM-ES3.. via only 4 lines:
A safety contact of the basic devices (e.g. 13-14) activates the

relays of the ESM-ES3.. (S11 and S15/S16).
Two lines on S23 and S24 are required for feedback/fault moni-

toring. A fault in the ESM-ES3.. thereby prevents the entire
safety chain from restarting.

Earth faults in the control lines are detected in addition to inter­nal faults.

Fig. 2: Connection of several ESM-ES3.. units to
basic device

If further ESM-ES3.. units are to be integrated into the system,
terminals S11 must be connected in parallel on all ESM-ES3..
units. This also applies to terminals S10 and terminals S15/S16.

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.

Feedback Loop

Power supply
and
Safety contacts

Commissioning
Procedure

Fig. 3: Feedback loop

Contactors connected to the ESM-ES3..
or the basic devices are monitored via
the feedback loop of the basic device. KA
and KB are the positively driven contacts
of the connected contactor or expansion
module.

Fig. 5:

Power supply A1 and A2.

(Power supply according to techn.
data )

S12

Fig. 4: Feedback Loop with Auto-Start

Contactors connected to the ESM-ES3.. or the
basic devices are monitored via the feedback
loop of the basic device. KA and KB are the
positively driven contacts of the connected
contactor or expansion module.

Fig. 6:

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 ESM-ES3.. :

Wire the ESM-ES3.. with the EUCHNER basic device
according to your application (see Fig. 1 to Fig. 2).

2. Wiring basic device:

Wire the basic device according to the required Perform­ance Level determined (see user information for the basic
device).

3. Wiring feedback loop:

Wire the feedback loop as shown in Fig. 3 and Fig. 4.

4. Wiring power supply:
Connect the power supply to terminals A1 and A2 (Fig. 5).
Warning: Wiring only in de-energized state.

5. Starting the device:

Switch the operating voltage on.

Warning:

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

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

The LEDs K1 and K2 on the basic device and on the ESM-
ES3.. are lit.

6. Triggering safety function:

Open the emergency stop circuit by actuating the con­nected safety switch. The safety contacts of the basic de­vice and the ESM-ES3.. open immediately.

7. Reactivation:

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

If the “Monitored manual start” starting behavior is set, close
the start button on the basic device to close the safety
contacts of the basic device and the ESM-ES3...

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

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