EUCHNER ESM-2H201 Operation manual

User Information
1
EUCHNER GmbH + Co. KG Kohlhammerstraße 16 D-70771 Leinfelden-Echterdingen Tel. [phone] Fax [phone] www.euchner.de [email protected]
2-Hand Safety Relay, Series ESM-2H2..
V1.1.0
• Up to PL e, SILCL 3, category 4
Correct Use
The ESM-2H2.. 2-hand safety relay is an extremely
compact, universal safety two-hand control unit. It
complies with EN574, Typ III C, and is intended for use
in safety circuits that are designed in accordance with
EN 60204-1, e.g. on presses, punches and bending
tools. Due to the internal error monitoring, the 2-hand
safety relay can be used, despite very compact dimen-
sions, for all applications up to the highest safety cate-
gory 4 and PL e according to EN ISO 13849-1, SILCL 3
according to EN 62061 or Typ III C according to EN 574.
Features
• 2 safe, redundant relay outputs
• Cyclical monitoring of the output contacts
• Feedback loop for monitoring downstream contactors or
expansion modules
• Short circuit and earth fault monitoring
• Extrem compact housing
Function
The EUCHNER 2-hand safety relay ESM-2H2.. is suitable
for setting up and monitoring two-hand circuits and is used
to protect the operators. Dangerous work steps can only be
triggered when both two-hand buttons connected are ope-
rated simultaneously, i.e. within 0.5 s.
It is to be ensured a single fault or a malfunction does not
result in the loss of the safety function and every fault is
detected by the cyclic self-monitoring at the latest prior to
the next actuation.
When the operating voltage is applied to A1-A2 and the
feedback loop X1-X2 is closed, the ESM-2H2.. is ready for
use. To be able to initiate a switching operation, the output
relays must be de-energized. The output relays only switch
to the energized position when the two-hand buttons T1
and T2 are operated simultaneously, i.e. within 0.5s.
Fig. 1 Block diagram ESM-2H2..
Installation
As per DIN EN 60204-1, the device is intended for installa-
tion 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.
Safety Precauti-
ons
Fig. 2 Installation/removal
Electrical Connec-
tion
• 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.
• External fusing of the safety contacts (6 A slow-blow or 8
A quick-action or 10 A gG) must be provided.
• A maximum length of the control lines of 1000 meters
with a line cross section of 0.75 mm2must not be excee-
ded.
• 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. Ope-
ning the device will void the warranty.
Fig. 3 onnections
A1: Power supply
A2. Power supply
S11: Control line T1
S12: Control line T1
S13: Control line T1
S21: Control line T2
S22: Control line T2
S23: Control line T2
X1; X2: Feedback loop
13-14: Safety contact 1
23-24: Safety contact 2
The output relays are not switched if:
• only one two-hand button is actuated or the time between the actuation of the 2 two-hand buttons is greater than 0.5 s,
• the feedback loop is open (fault in the external contactor),
• another error (short circuit, cable break, error in the switching device) has occurred.
When T1 and/or T2 are/is released, the output relays opens immediately. In order to trigger a new operation, both two-hand
buttons must first be released and the feedback loop must be closed.
• 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.
• Note down the version of the product (see label “Vx.x.x”)
and check it prior to every commissioning of a new de-
vice. If the version has changed, the overall concept of
the control system in which the device is incorporated
must be validated again by the user.
• 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 instruc-
tions in this user information, otherwise there is a risk
that the safety function will be lost.
• It is not allowed to open the device, tamper with the
device or bypass the safety devices.

User Information
2
EUCHNER GmbH + Co. KG Kohlhammerstraße 16 D-70771 Leinfelden-Echterdingen Tel. [phone] Fax [phone] www.euchner.de [email protected]
2-Hand Safety Relay, Series ESM-2H2..
V1.1.0
ESM-2H2..
The arrangement of the two-hand buttons must be designed in accordance with the standard EN 574 such that accidental
actuation or simple bypassing of the safety function is excluded.
The ESM-2H2.. unit is provided for the connection of 2-hand push-buttons, with one normally open or one normally colsed
contact.
Figur 1 shows the wiring of the ESM-2H2.. with a 2-hand push-buttons:
Applications
Fig. 1:
Wiring of the ESM-2H2.. with a 2-hand push
-buttons
Fig. 2: Feedback loop
Contactors connected to the ESM-2H2.. or the basic devices
are monitored via the feedback loop of the basic device. K A
and K B are the positively driven contacts of the connected
contactor or expansion module.
Feedback loop
Note: The items listed under “Electrical connection” must be observed during commissioning.
Commissioning
Procedure
1. Wiring ESM-2H2..:
Wire the ESM-2H2.. With the 2-hand push button according
to your application (see Fig. 1).
2. Wiring feedback loop:
Wire the feedback loop as shown in Fig. 2.
3. Wiring power supply:
Connect the power supply to terminals A1 and A2.
Warning: Wiring only in de-energized state.
4. Starting the device:
Switch the operating voltage on.
5. Switch to working condition:
Press the two buttons T1 and T2 simultaneously, or within
0.5 seconds.
The positive-guided relay switches.
6. Switch into hibernation:
Release the two buttons T1 and T2.
The positive-guided relay swiches off.
Jumper X1-X2:
See description
X1 X2
Installation
Avoiding unintentional actuation or bypassing of the safety device
The arrangement of the two-hand buttons must be designed in accordance with the standard EN 574 such that accidental
actuation or simple bypassing of the safety function is excluded.
The operation of both buttons using one hand must be prevented by an adequate distance (at least 260 mm) or by a separa-
ting wall. Actuation using forearm, elbow, knee, hip or other parts of the body can be effectively prevented by a further inc-
rease in the distance between the two buttons, adequate distance from the floor and/or covers and/or separating walls.
Distance from the two-hand buttons to the danger area
It is necessary to maintain a minimum distance between the buttons for the two-hand circuit and the danger area on the
machine or plant so that, after the release of one or both buttons, the machine or plant can only be reached once the dange-
rous movement has been interrupted or completed. According to the standard EN 999, the distance is calculated with the
following equation:
S = (K · T) + C
S: Minimum distance from the nearest pushbutton (two-hand button) to the danger area.
K: Parameter in mm/s, derived from data on the approach speeds of the body or parts of the body, for two-hand circuits
1600 mm/s.
T: The overtravel of the overall system in seconds, that is the time from releasing the two-hand button to the end of the dan
gerous movement.
C: Additional distance in mm that based on entry into the danger area prior to the triggering of the safety device. For twohand
circuits this is 250 mm, this distance can also be set to 0 mm given an adequate cover on the buttons, however then S
must be at least 100 mm.
Example
The overtravel time for the entire system is 90ms. Then the above equation gives for the minimum distance:
S = (1600 mm/s · 0.09 s) + 250 mm
S = 144 mm + 250 mm = 394 mm
If a suitable cover is used, S can be reduced to 144mm (see above).

User Information
3
EUCHNER GmbH + Co. KG Kohlhammerstraße 16 D-70771 Leinfelden-Echterdingen Tel. [phone] Fax [phone] www.euchner.de [email protected]
2-Hand Safety Relay, Series ESM-2H2..
V1.1.0
Maintenance
What to Do in
Case of a Fault?
Once per month, the device must be checked for proper
function and for signs of tampering and bypassing of the
safety function (to do this, check the wiring of the device
and activate the emergency stop function. Check the delay
time).
The device is otherwise maintenance free, provided that it
was installed properly.
Note:
Additional data can be requested from the manufacturer for
applications that deviate from these conditions.
Safety
Characteristics
According to
EN ISO 13849-1
The device is certified according to EN ISO 13849-1 up to a
Performance Level of PL e.
Techn. Data
Operating voltage ESM-2H201 ESM-2H202 ESM-2H203
AC/DC 24 V AC 115 V AC 230 V
Rated supply frequency AC: 50-60 Hz
Permissible deviation +/- 10 %
Power consumption DC 24 V AC 230 V
approx. 1.5 W approx. 3.7 VA
Control voltage at S12-S13 and at S22-S23 DC 24 V
Control current (both switches) approx. 2 x 40 mA
Release time for the safety relays after release of a button < 20 ms
Response delay after actuation of the buttons < 20 ms
Syncronization time < 0.5 s
Safety contact configuration 2 NO contacts
Max. switching voltage AC 250 V
Safety contact breaking capacity AC: 250 V, 2000 VA, 6 A for ohmic load,
250 V, 3 A for AC-15
DC: 24 V, 192 W, 6 A for ohmic load;
24 V, 3 A for DC-13
Max. total current through all contacts: 12 A
Minimum contact load 24 V, 20 mA
Contact fuses 6 A slow-blow or 8 A quick-action or 10 A gG
Line cross section 0.14 - 2.5 mm2
Max. length of control line 1000 m with 0.75 mm2
Contact material AgSNO 2
Contact service life mech. approx. 1 x 107operating cycles
Test voltage 2.5kV (control voltage/contacts)
Rated impulse withstand voltage, leakage path/air gap 4 kV (DIN VDE 0110-1)
Rated insulation voltage 250 V
Degree of protection IP20
Degree of contamination 2 (DIN VDE 0110-1)
Overvoltage category 3 (DIN VDE 0110-1)
Temperature range DC 24 V: -15 °C to +60 °C
AC 230 V/115 V/24 V: -15 °C to +40 °C
Weight ca. 230 g
Mounting DIN rail according to EN 60715TH35
Safety characteristics according to EN ISO 13849-1 for all variants of ESM-2H2..
Load (DC-13; 24 V) <= 0.1 A <= 1 A <= 3 A
T10d [years] 20 20 20
Category: 4 4 4
PL e e e
PFHd [1/h]: 1.2E-08 1.2E-08 1.2E-08
nop [cycle / year] <= 400,000 <= 100,000 <= 22,500
What to Do in
Case of a Fault?
If the fault still exists, perform the steps listed under
“Commissioning Procedure”.
If these steps do not remedy the fault either, return the
device to the manufacturer for examination.
Opening the device is impermissible and will void the
warranty.
Device does not switch on:
• Check whether the 2-hand button of correct function.
• Check whether the wiring.
• Check the supply voltage on A1 and A2
• Is the feedback loop closed?

User Information
4
EUCHNER GmbH + Co. KG Kohlhammerstraße 16 D-70771 Leinfelden-Echterdingen Tel. [phone] Fax [phone] www.euchner.de [email protected]
2-Hand Safety Relay, Series ESM-2H2..
V1.1.0
Dimension
Drawing
Subject to technical modifications, no responsibility is accepted for the accuracy of this information. © EUCHNER GmbH + Co. KG 109071-05-03/15 (Translation of the Original Operating Instructions)
Fixed
Terminals Plug-In
Terminals