Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 64)

62
P/N 133487
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Overview
62
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
EZ-SCREEN
Instruction Manual
Cascadeable EZ-SCREEN
Figure 7-8. Hookup of E-stop buttons to the last receiver in the
cascade
7.8 Emergency Stop Buttons and Rope/Cable Pulls
Cascadeable EZ-SCREEN receivers may be connected to one
or more E-stop buttons. The button(s) must connect to the end of
the last receiver in the cascade, in place of the terminator plug.
The connected E-stop button(s) will activate/deactivate the
OSSD outputs in all receivers in the cascade.
The number of E-stop buttons allowed in a series connection is
limited by the total resistance per channel. The total resistance
is the sum of all contact resistance values in the channel, plus
the total wire resistance in the channel. The maximum total
resistance per channel is 100 Ohms.
NOTE: The simultaneity between the two E-stop contacts, on
opening and closing, is 3 seconds. If simultaneity is not
met on either opening or closing, the first receiver’s display
will flash “|- - -|.” If simultaneity is not met on opening, the
closed contact can be opened later (after more than 3
seconds), then both contacts must be closed again.
deliberate action (such as twisting, pulling, or unlocking). The
switch should be a “positive-opening type,” as described by
IEC947-5-1. A mechanical force applied to such a button (or
switch) is transmitted directly to the contacts, forcing them
open. This ensures that the switch contacts will open whenever
the switch is activated. ANSI/NFPA 79 specifies the following
additional requirements:
•
Emergency Stop push buttons shall be located at each
operator control station and at other operating stations where
emergency shutdown shall be required.
• Stop and Emergency Stop push buttons shall be continuously
operable from all control and operating stations where located.
• Actuators of Emergency Stop devices shall be colored Red.
The background immediately around the device actuator shall
be colored Yellow. The actuator of a push-button-operated
device shall be of the palm or mushroom-head type.
• The Emergency Stop actuator shall be a self-latching type.
NOTE: Some applications may have additional requirements.
The user must comply with all relevant regulations.
WARNING . . .
Multiple E-Stop Switches
• Whenever two or more E-stop switches are connected
to the same EZ-SCREEN receiver, the contacts of the
E-stop switches must be connected together in series. This series
combination is then wired to the respective
EZ-SCREEN receiver input.
Never connect the contacts of multiple E-stop switches in
parallel to the EZ-SCREEN inputs; this defeats the switch
contact monitoring ability of the EZ-SCREEN light curtain,
and creates an unsafe condition which could result in
serious bodily 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 EZ-SCREEN light curtain reset (if using
latch 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
bodily injury or death.
WARNING . . .
Emergency Stop Functions
If Cascade Input is used for an Emergency Stop function, do not
mute or bypass the safety outputs (OSSDs) of the EZ-SCREEN.
NFPA79 requires that the Emergency Stop function remain active at
all times. Muting or bypassing the safety outputs will render the
Emergency Stop function ineffective.
WARNING . . .
Reset Routine Required
U.S. and international 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.
E-Stop Switch Requirements (Positive-Opening)
As shown in Figure 7-8, the E-stop switch must provide two
contact pairs, which are closed when the switch is in the
“armed” position. Once activated, the E-stop switch must open
its contacts and return to the closed-contact position only after
22 awg Wh
E-Stop 1 E-Stop 2 E-Stop N
Bk
Bn
QDE2R4-8..D Cable Pinout*
Pin #1 ― Brown (Ch 1a) Pin #5 ―n.c.
Pin #2 ― Black (Ch 1b) Pin #6 ―n.c.
Pin #3 ― Blue (Ch 2b) Pin #7 ―n.c.
Pin #4 ―n.c. Pin #8 ― White (Ch 2a)
* Standard M12 / Euro-style cables (8-pin male QD) can also
be used, although pin number / wire color must be verified.
Bu