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CAUTION. . .
Shock Hazard
Always disconnect power
from the E-Stop Safety
Module and all power from the
machine being controlled before
making any wire connections.
Electrical installation and wiring must
be made by qualified personnel and
must comply with the NEC (National
Electrical Code), EN60204-1 and -2,
and all applicable local standards and
codes.
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E-Stop Safety Module
When a 1-channel E-stop is used, the user must guard against failure modes that can
result in an unsafe condition: for example, the failure of the contact to a short circuit
condition. A switch with positive opening operation should be used to reduce the
possibility of a failure of the switch to open. A short circuit failure results in loss of
switching function. This can occur from a short across the switch contacts, a short
across the wires connected to the switch somewhere between the switch and the
E-Stop Safety Module, or a short to a secondary source of power. To reduce these
possibilities, physically separate the wires from each other and from other sources of
power (e.g., in separate wireways or conduit).
According to the definition of European standard EN 954-1, a 1-channel E-stop should
be used only in an application where Safety Category 2 or less (1 or B) has been
determined via a risk-assessment procedure.
2-channel E-stops, with positive open switches, are designed to issue a stop command
even in the event of a single failure of this type and provide a high level of safety.
If the Module is configured for 2-channel E-stop, the immediate normally open output
contacts (13-14, 23-24, 33-34 and 43-44 ), will open as soon as at least one of the two
E-stop contacts opens. Although simultaneity is not required, the E-stop contacts must
both be open at the same time and then both be closed, to reset the output contacts. If
not, the unit will go into a lockout condition that results in the outputs opening and
requiring a reset after the fault has been corrected.
The E-Stop Safety Module must be installed inside an enclosure. It is not designed for
exposed wiring. It is the user's responsibility to house the Safety Module in an
enclosure with NEMA 3 (IEC IP54) rating, or better.
Dimensions of the Safety Module are shown in Figure 5. The Safety Module mounts
directly to standard 35 mm DIN rail.
It is not possible to give exact wiring instructions for a device such as this E-Stop
Safety Module, which interfaces to a multitude of machine control configurations. The
following guidelines are general in nature.
The ES-..A-5A has no delay function. Its output relay contacts open within 30 milliseconds
after the E-stop switch contact opens. This classifies this E-Stop Safety Module as a
functional "Category 0" E-stop control as defined by NFPA 79 (National Fire Protection
Association Standard for Industrial Machinery) and EN 418 (European Standard: "Safety
of Machinery, Emergency Stop Equipment, Functional Aspects – Principles of Design").
– Models ES-GA-5A and ES-HA-5A
Mechanical Installation
Electrical Installation
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