E-Stop Safety Relay
– Model ES-TA-3D1
SECTION 4 – Electrical Hookup and Initial Checkout
It is not possible to give exact wiring instructions for a device such as the model
ES-TA-3D1 emergency stop monitoring safety relay which interfaces to a multitude of
machine control configurations. The following guidelines are general in nature.
Model ES-TA-3D1 has no delay function. The output relay contacts open within 25
milliseconds from the time that any emergency stop switch contact opens. This
classifies the ES-TA-3D1 as a functional “Category 0” emergency stop control as
defined by NFPA 79 (National Fire Protection Association Standard for Industrial
Machinery) and EN418 (European Standard: “Safety of Machinery, Emergency Stop
Equipment, Functional Aspects – Principles of Design”).
4.1 Connection of Emergency Stop Switches
Connect the two poles of each Emergency Stop switch as shown in Figure 3. The
switches in Figure 3 are shown in their “ready” position with both contacts closed.
See Product Specifications on page 20 for E-stop Switch Input Requirements.
NOTE: Jumper any unused inputs to simulate an Emergency Stop switch in the
closed-contact position.
4.2 Connection of Reset Switch
The circuit Reset switch can be any mechanical switch, such as a normally open
momentary switch, a two-position key switch, etc. The Reset switch must meet the
requirements listed in the Product Specifications on page 20. The Reset switch
connects between terminals 14 and 34 of the safety relay.
The Reset switch must be located outside and not accessible from the area of
dangerous motion, and must be positioned so that any area of dangerous motion
may be observed by the switch operator during the Reset operation. Any areas not
in full view must use supplemental guarding to detect personnel.
CAUTION . . .
Electrical Hazard
Always disconnect
power from the ES-TA-
3D1 safety relay and all power
from the machine being controlled
before making or removing any
wire connections.
Electrical installation and wiring
must be made by qualified
personnel and must comply with the
NEC (National Electrical Code),
IEC 60204-1 and -2, and all
applicable local standards and
codes.
CAUTION . . .
Do Not Use As A Safety
Switch (Interlock) Monitor
The ES-TA-3D1 is not to
be used as a gate or interlocking
switch monitor. The use of input
devices other than Emergency Stop
switches (see section 2) may result
in a reduction in the safety category
as described by EN 954-1.
!
WARNING . . .
Do Not Use Jumpers to
Bypass an E-stop circuit.
!
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