E-Stop Safety Module
– Models ES-GA-5A and ES-HA-5A
Connection of Reset Switch
The Reset Circuit switch can be any mechanical switch such as a normally open
momentary switch, or a two-position key switch. The Reset switch must be capable of
reliably switching 12 to 18V dc at 40 to 100 milliamps. As shown in Figure 2, the Reset
switch connects between terminals S33 and S34 of the Safety Module. In addition,
connect a jumper wire between terminals S32 and S33.
The Reset switch must be located outside of – and not be 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 procedure.
Automatic Reset Mode
Model ES-..A-5A may be used also with automatic reset. This requires a jumper
between S32-S33 and S32-S35. The E-Stop Safety Module will reset (and the outputs
energize) as soon as the E-stop switch returns to its closed-contact position.
The automatic reset mode is useful for some automated processes.
However, if
automatic reset is used, it is necessary to provide an alternate means of preventing
resumption of hazardous machine motion, until an alternate reset procedure is
performed.
The alternate procedure must include a Reset switch, located outside the
area of dangerous motion, which is positioned so that any area of dangerous motion
may be observed by the switch operator during the reset procedure.
NOTE:
The minimum amount of time required for the ES-..A-5A Module to be in a
STOP or OFF condition is 500 ms. This “recovery time” (OFF-state) is required for the
internal circuitry of the Safety Module to normalize, allowing a reliable reset to occur. A
lockout will occur if the Module is cycled too quickly. To clear the lockout, the Module
must be re-cycled, meeting the minimum OFF time requirement.
Auxiliary Monitor Contact/Solid-State Monitor Outputs Connection
The action of the auxiliary monitor contact, K3, inversely “follows” the action of the
output relays, K1 and K2 when power is applied to the E-stop safety module. The
contact of K3 is open when the output contacts of K1 and K2 are closed, and vice
versa. The K3 auxiliary monitor contact is a light-duty contact to be used only for
control functions that are NOT safety-related. A typical use is to communicate the
status of the safety module output to a programmable logic controller (PLC). The
switching capacity of the K3 auxiliary monitor contact is 125V ac or V dc maximum at
500 mA maximum (resistive load). Connection to the auxiliary monitor contact is made
at terminals 51 and 52 (see Figure 2).
There are two solid-state monitor outputs, each capable of switching up to 20
milliamps at 24V dc. One output at terminal Y32 follows the action of the output
circuits (K1 and K2); the other output at terminal Y35 opens (low signal) when there is
an internal power supply fault. See Figure 2 for hookup information.
WARNING . . .
Multiple E-Stop Switches
• Whenever two or more E-stop switches
are connected to the same E-Stop Safety
Module, the contacts of both switches
must be connected together in series.
This series combination is then wired to
the respective Safety Module input.
Never connect the contacts of multiple
E-stop switches in parallel to the
E-Stop Safety Module inputs; this
defeats the switch contact monitoring
ability of the Safety Module, and
creates an unsafe condition which
could result in serious injury or death.
•
Also, when two or more E-stop
switches are used, each switch must
be individually actuated (engaged),
then re-armed and the E-stop Safety
Module reset
(if using manual reset
mode). This allows the monitoring
circuits to check each switch and its
wiring to detect faults.
Failure to test
each switch individually in this manner
could result in undetected faults and
create an unsafe condition which could
result in serious injury or death.
!
WARNING . . .
Reset
Routine Required
ANSI B11 and NFPA 79
standards require that a reset
routine be performed after returning the
E-stop switch to its closed-contact
position (when arming the E-stop switch).
When automatic reset is used, an alternate
means must be established to require a
reset routine, after the E-stop switch is
armed.
Allowing the machine to restart
as soon as the E-stop switch is armed
creates an unsafe condition which could
result in serious injury or death.
!
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