Banner SI-HG63 Hinge Style Switches - Manual (Page 8)

Connection to a Machine
Electrical connection is via a 6-pin dual-key M12/micro-style QD and cordsets (see Cordsets on page 12).
Perform a risk assessment to determine the appropriate level of safety circuit performance (integrity) and the means of interfacing the
switch(es) with the machine control circuit. While Banner Engineering always recommends the highest level of safety in any application,
the user is responsible to safely install, operate, and maintain each safety system and comply with all relevant laws and regulations.
To ensure the highest level of reliability (Control Reliable or Category 4, for example), wire the positively-driven safety contacts (safety
contacts that are closed when the actuator is engaged) from each of two individual safety switches per interlock guard in a dual
channel hookup to a safety module (for example, ES-FA-9AA), safety controller (for example, SC22-3), or the safety related part of the
machine control that complies with the required level of safety performance.
Safety Switch
#1
Safety Switch
#2
Input Channel
#1
Input Channel
#2
2-channel Safety Module
(2-channel E-stop Module
2-channel Gate Monitor Module, etc.)
Single gate
or guard
11
(21)
11
(21)
12
(22)
12
(22)
The non-safety contact (33/34) will switch at a greater degree (rotation) than the
safety contacts and may not indicate if the guard is slightly open (see
Figure 3 on
page 1). In such situations, an unused safety contact can more accurately indicate
the status of the guard.
Refer to the installation instructions provided with the safety module or safety con-
troller for information regarding the interface of the safety module to the machine
stop control elements.
Figure 17. Connect two redundant safety switches per interlock guard to an appropriate 2-channel input safety module
Two functions of the safety module or safety controller are:
1. To provide a means of monitoring the contacts of both safety switches for contact failure, and to prevent the machine from restart-
ing if either switch fails.
2. To provide a reset routine after closing the guard and returning the safety contacts to their closed position. This prevents the con-
trolled machinery from restarting by simply closing the guard (reinserting the key/actuator, for example). This necessary reset func-
tion is required by ANSI B11.0 and ANSI/NFPA 79 machine safety standards.
Use only positively-driven, normally-closed safety contacts from each switch for connection to the safety module, controller, or the safety
related part of the machine control (see
Figure 3 on page 1). A typical use for the normally-open non-safety contact is to communicate
status with a process controller or for other control functions that are not safety-related. Refer to the installation instructions provided with
the safety modules or controllers for more information regarding the interface of the safety module to the machine stop control elements.
WARNING: Safety Circuit Integrity
A risk assessment must be performed to determine the appropriate safety circuit integrity level or
category to ensure the expected risk reduction is achieved and all relevant regulations and standards are
met (see ANSI B11.0 and ANSI B11.19, ISO 12100 and ISO13849-1 or the appropriate standards).
Important: The design, installation and the means of interfacing of the safety switches greatly impact the
level of safety circuit integrity. It is recommended that two individual safety switches be used to monitor each
guard and that the normally-closed safety contacts from each of the two safety switches be connected in a
dual channel method to a safety module or safety controller to achieve control reliability (OSHA 29CFR1910
or ANSI B11.19) or Category 3 or 4 (ISO 13849-1, EN 954-1). This is required to provide monitoring for
safety switch failure, and to provide the necessary reset routine, as required by NFPA 79 and IEC 60204-1.
Use of only one safety switch per interlock guard is not recommended in situations that can result in
serious injury or death.
Monitoring Series-Connected Safety Interlock Switches
When monitoring the position of several guards with a single safety module or controller, the contacts of the corresponding pole of each
switch must be connected together in series. Never connect the contacts of multiple switches in parallel. Such a parallel connection can
defeat the switch contact monitoring ability of the module and could create an unsafe condition.
Hinge Wing Safety Interlock Switches
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