System Installation
MM-TA-12B Muting Module
Instruction Manual
3.5 Installing Input Devices
3.5.1 Manual Reset Switch
The manual reset switch connects to pins 1 and 4 of the Reset connector (see
Figure 3-4).
Any reset switches must be located so that a reset is possible only from outside,
and in full view of, the hazardous area. The switch must also be out of reach
from within the safeguarded space. If any hazardous areas are out of view from
the switch location, additional means of safeguarding must be provided.
The switch should be protected from accidental or unintended actuation (e.g.,
through the use of rings or guards).
Using a key switch provides some level of personal control, because the key may
be removed. This will hinder a reset while the key is under the control of an indi-
vidual, but must not be relied upon solely to guard against accidental or unautho-
rized reset. Spare keys in the possession of others, or additional personnel enter-
ing the safeguarded area unnoticed may create a hazardous situation.
Reset Routine
The MM-TA-12B Muting Module requires a manual reset to clear a latch condition
and resume operation following a stop command. To perform a manual reset,
close the normally open reset switch and hold it there for at least 1/4 second, but
not longer than 2 seconds, and then re-open the switch. Internal lockout condi-
tions also require a manual reset to return the system to RUN mode after the fail-
ure has been corrected and the input correctly cycled.
3.5.2 Muting Devices
The user is required by OSHA and ANSI to arrange, install, and operate the safety
system so as to protect personnel and minimize the possibility of defeating the
safeguard.
Indication that the safeguard is muted must be provided and be readily observ-
able (ANSI B11.19 Section 4.2.3.3.3). Failure of this indication should be
detectable and prevent the Module from initiating a mute cycle. If this is not pos-
sible, the operation of the indicator should be verified at suitable intervals. Mute
devices must meet a 3-second simultaneity requirement to activate muting; that
is, devices in a pair must be activated within 3 seconds of one another.
3.5.2.1 General Muting Device Requirements
The muting devices (typically sensors or switches) must, at a minimum, comply
with the following requirements:
1) There must be a minimum of two independent hard-wired muting devices.
2) The muting devices must either both have normally open contacts; or one
device with a PNP output and one device with a NPN output, both of which
must fulfill the input requirements listed in the Specifications (Secton 2).
These contacts must close when the switch is actuated, and must open (or not
conduct) when the switch is not actuated or in a power OFF condition.
3) The activation of the inputs to the muting function must be from separate
WARNING . . .
Location of the
Manual Reset
Switch
The reset switch must be located
outside of, and not be accessible
from within, the area of dangerous
motion, and it must be positioned
so that the area of dangerous
motion may be observed by the
switch operator during the reset
operation.
Black
Brown
2
3
4
5
1
Reset Input, pin 4
(see Section 3.3)
Figure 3-4. Manual Reset switch con-
nections
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