Table of Contents
Advertisement
MM-TA-12B Muting Module
Instruction Manual
WARNING . . .
Mute Status Must Be
Readily Observable
Indication that the safety device is
muted must be provided and must
be readily observable (per ANSI
B11.19 section 4.2.3.3.3).
Failure of this indication should be
detectable and prevent the next
mute, or the operation of the indi-
cator should be verified at suitable
intervals.
Lamp Monitoring must be selected
if the System is to be used in a
country governed by EN regulation
(i.e., requiring the CE marking).
WARNING . . .
Mute on Power-Up
The Mute on Power-Up
function should be used only in
applications where:
• Muting the System (M1 and M2
closed) when power is applied is
required, and
• Using it can not, in any situation,
expose personnel to any hazard.
Buy: www.ValinOnline.com | Phone 844-385-3099 | Email: CustomerService@valin.com
1.13 Mute Lamp Output (ML)
Most applications require that a lamp (or other means) be used to indicate when
the primary safety device (e.g., light screen) is muted; the control box provides
for this (see WARNING at left). This indication is selectable between a monitored
or a non-monitored output signal (NPN sinking). The monitored output will pre-
vent the initiation of a mute after an indicator failure is detected (current draw
falls below 10 mA or goes above 360 mA). If the muting function is to be used in
a country governed by EN regulation (requiring the CE mark), Lamp Monitoring
must be selected and the lamp used must meet applicable requirements (see
Section 3.5.3).
1.14 Backdoor Timer
The Backdoor Timer allows the user to select a maximum period of time that
muting is allowed to occur. This feature hinders the intentional defeat of the mut-
ing devices to initiate an inappropriate mute. It is also useful for detecting a com-
mon mode failure that would affect all mute devices in the application.
The timer begins when the second muting device makes the simultaneity require-
ment (within 3 seconds of the first device), and will allow a mute to continue for
the predetermined time. After the timer expires, the mute ends – no matter what
the signals from the mute devices indicate. If the MSSI is open, the OSSD out-
puts will turn OFF and must be manually reset (if Module is configured for
Manual Reset). The Override function can be activated (see Section 1.16) to force
the OSSDs ON in order to clear the obstruction.
If the Backdoor Timer expires, a #50 error code will be displayed until all mute
device inputs are open and the MSSI is active/closed.
1.15 Mute on Power-Up
The Backdoor Timer DIP switch settings also enable or disable the Mute on
Power-Up function (see Figure 3-2). Mute Enable must be configured "functional"
and be closed to allow Mute on Power-Up. (See WARNING at left.) If selected,
the Mute on Power-Up function will initiate a mute when power is applied, the
Mute Enable input is closed, the MSSI inputs are active (closed), and either
M1-M2 or M3-M4 (but not all four) are closed.
If Auto Reset is configured, the Module allows 10 seconds for the MSSI and
USSI to become active (closed), to accommodate systems that may not be
immediately active at power-up.
If Manual Reset is configured, the first valid reset after the MSSI and USSI are
active (closed) will result in a mute cycle if all other conditions are satisfied.
Introduction
Advertisement
Table of Contents
