1
Operating Instructions
Safety Relay ESM-BT4..
Correct use
ESM-BT4.. is an emergency stop safety relay com-
bination that combines non-time-delayed (u) and
time-delayed (v) contacts in a very compact housing.
This permits dangerous components of a system to
be switched off quickly and safely in an emergency
situation. At the same time, other safety circuits
can continue to be supplied with power for up to
30 seconds to allow a tool to be moved to its idle
position or to brake overtraveling parts, for example.
Before the device is used, a risk assessment must
be performed on the machine, e.g. according to the
following standards:
f
EN ISO 13849-1
f
EN ISO 12100
f
IEC 62061.
Correct use includes observing the relevant require-
ments for installation and operation, particularly
based on the following standards:
f
EN ISO 13849-1
f
EN 60204-1
f
IEC 62061.
Important!
f
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.
f
The device user must assess and document
remaining risks.
f
If a data sheet is included with the product, the
information on the data sheet applies.
Safety precautions
WARNING
f
Installation and setup of the device must be
performed only by authorized personnel.
f
Observe the country-specific regulations when
installing the device.
f
The electrical connection of the device is only
allowed to be made with the device isolated.
f
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.
f
It is not allowed to open the device, tamper with
the device or bypass the safety devices.
f
All relevant safety regulations and standards are
to be observed.
f
The overall concept of the control system in
which the device is incorporated must be vali-
dated by the user.
f
Failure to observe the safety regulations can re-
sult in death, severe injuries and serious damage.
f
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
f
4 safe, redundant relay outputs. Depending on
variant:
- 3 non-time-delayed contacts, 1 time-delayed
contact
- 2 non-time-delayed contacts, 2 time-delayed
contacts
- 1 non-time-delayed contact, 3 time-delayed
contacts
f
Continuously adjustable delay time (1 … 30 s)
or fixed delay time (ESM-BT4..-20S (2 s);
ESM-BT4..-50S (5 s))
f
Connection of:
- Emergency stop buttons
- Safety switches
- Non-contact safety switches
- Safety components with OSSD outputs
f
Single- and dual-channel operation possible
f
Feedback loop for monitoring downstream contac-
tors or expansion modules
f
Cyclical monitoring of the output contacts
f
Indication of the switching state via LED
f
2 starting behaviors possible:
- Monitored manual start
- Automatic start
f
Short circuit and ground fault monitoring
f
Use up to PL e, SILCL 3, category 4
Function
The moving parts of a machine or system can be
quickly and safely stopped in case of danger with the
non-time-delayed contacts of the ESM-BT4... Safety
contacts with time-delay switch-off are also integrat-
ed into the ESM-BT4... They are used whenever it is
safer to keep supplying power to parts of a machine
after the emergency stop button is actuated.
It is ensured that a single fault or malfunction does
not lead to a loss of the safety function and that
every fault is detected by cyclical self-monitoring
no later than when the system is switched off and
switched on again.
The time-delayed contacts switch on at the same
time as the non-time-delayed contacts, but they are
switched off again only after the time set on the
potentiometer elapses (1 … 30 s) or after a fixed
delay time (ESM-BT4..-20S; ESM-BT4..-50S) when
the emergency stop button is operated.
The power supply must be present during the time
sequence.
ESM-BT401 (1 non-time-delayed/3 time-delayed)
ESM-BT411 (2 non-time-delayed/2 time-delayed);
ESM-BT421 (3 non-time-delayed/1 time-delayed)
Fig. 1: Block diagrams ESM-BT4..
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
f
A safety transformer according to EN 61558-2-6 or
a power supply unit with electrical isolation from
the mains must be connected.
f
External fusing of the safety contacts must be
provided.
f
A maximum length of the control lines of 1,000 m
with a conductor cross-section of 0.75 mm² must
not be exceeded.
f
The conductor cross-section must not exceed
2.5 mm².
f
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
S10
Control line
S21
Start control line
S13
Control line
S14
Control line
S12
Control line
13-14
Safety contact 1 (u)
23-24 /
27-28
Safety contact 2 (u / v)
33-34 /
37-38
Safety contact 3 (u / v)
47-48
Safety contact 4 (v)
Fig. 3: Connections
(u = non-time-delayed, v = time-delayed)
Setup procedure
Notice
The items listed under
must
be observed during setup.
1. Wiring emergency stop circuit:
Wire the emergency stop circuit according to the
required Performance Level determined (see Fig.
2. Wiring start circuit:
Wire the start circuit according to Fig. 10 or Fig. 11
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. 12 or Fig. 13.
