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Using positive-opening or direct-drive components, installed and mounted in a positive mode
4.4.3 Machine Primary Control Elements and EDM Input
Each of the two Machine Primary Control Elements (MPCE1 and MPCE2) must be capable of immediately stopping the dangerous
machine motion, irrespective of the state of the other. These two channels of machine control need not be identical, but the stop time
performance of the machine (Ts, used to calculate the safety distance, see
11) must take into account the slower of the two channels. Some machines offer only one Primary Control Element. For such machines,
it may be necessary to duplicate the circuit of the single MPCE, by adding a second. Refer to
page 33 and
Generic Wiring — Interface Module (2-Channel EDM, Manual Reset)
for additional information.
4.4.4 Manual Reset/Remote Test Input and EDM
A means is provided for the connection of an external remote test switch or contact (typically a normally open, held closed). Cycling this
switch "turns Off" both OSSD outputs.
A single input provides the means to reset the system from a latch or lockout condition, to externally test the light screen and its
interface, and to monitor external devices (EDM) for proper operation. If the System is in Run condition with outputs On, operating the
switch results in a test. If the System is Latched or Locked Out, operating the switch results in a reset. If this input is connected to 0V dc
or left floating, the System goes to a lockout condition on power-up. (See
clearing lockouts.)
Connect the receiver's reset/test wire (pin 8) to the supply voltage (see
Wiring — Interface Module (2-Channel EDM, Manual Reset)
(N.C.) reset switch, or contacts of the Machine Control Test circuit (typically a normally open contact held or energized closed), or the
monitoring contacts of the external device(s) being verified. One switch could be used for the Reset and Test functions, or they can be
separate switches. However, all switches should be mounted as specified for a reset switch (see
Manual Reset/System Test Procedure
To operate the switch (and perform a manual reset or a system test), open the normally closed (N.C.) switch for a minimum of 1/4
second and then close it.
Manual Reset
From a Latched or Lockout condition, operating the switch results in a manual reset. Safe work procedures must require that a start-up
procedure is followed and that the individual performing the reset of the guarding device verifies that the entire hazardous area is clear
of all personnel, before performing each reset. If any area can not be observed from the reset switch location, additional supplementary
guarding must be used: at minimum, visual and audible warnings of machine start-up.
Resetting a safe guarding device must not initiate hazardous motion.
Remote (External) Test
When in RUN mode, opening this switch for more than 1/4 second will initiate a Test cycle that turns OFF the OSSD outputs and
generates an internal self-test.
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Automatic (Machine) Test: An external switch, typically a normally open contact that is held closed, is used to externally
generate a test cycle of the EZ-SCREEN Type 2 and its interface. Depending on the application this switch can be a limit-style
switch, a hard contact from a relay, or an output from the machine control logic.
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Manual Test: A normally closed (N.C.) momentary type switch used for manual reset can also be used to manually initiate a test
cycle. This remote Test input may be useful for EZ-SCREEN Type 2 System setup and to verify machine control circuit operation.
WARNING: Test Function
A machine or automatic test of the EZ-SCREEN Type 2 and its interface may be required as determined by a risk
assessment and appropriate standard (for example, ISO 14121 and EN ISO 13849-1). Failure to test the
safeguarding function at appropriate intervals may lead to the loss of the safety function.
External Device Monitoring Hookup
It is strongly recommended that one normally closed and one normally open, forced-guided monitoring contact of each FSD and MPCE
be connected to the Monitoring circuit (see
(2-Channel EDM, Manual Reset)
Receiver quick disconnect pin 8 provides connection for external device monitoring. External Device Monitoring (EDM) must be wired in
one of two configurations: Power Monitoring or No EDM.
on page 34) via the reset switch. The switch should be a normally closed
Generic Wiring to FSDs (manual reset)
on page 34). If this is done, proper operation of the MPCEs will be verified.
www.bannerengineering.com - Tel: 763.544.3164
Calculating the Safety Distance (Minimum Distance)
Generic Wiring to FSDs (manual reset)
on page 34, or consult the machine manufacturer
Troubleshooting and Lockout Conditions
Generic Wiring to FSDs (manual reset)
Reset Switch Location
on page 33 and
Generic Wiring — Interface Module
®
EZ-SCREEN
Type 2 Light Screen
on page
on
on page 38 for
on page 33 and
Generic
on page 15).
31
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