Emergency Stop Safety Relay – Dual Channel (RFT149)
An Emergency Stop Safety Module is used to increase the control reliability of an emergency stop circuit. The Dual-Channel Emergency Stop Safety Relay monitors emergency stop devices, such as palm buttons and rope/cable pulls, and positive-opening safety switches used for guard/gate interlocking. It is designed to connect safety devices, such as interlock switches, to the machine control unit. This dual channel emergency stop safety relay compares input and output signals and provides failure to a safe condition if there is a failure in the interlocking interface control unit.
- The safety inputs can monitor hard/relay contacts in a dual-channel hookup or a +24V dc source switched by hard/relay contacts in single-channel hookup
- Four normally open output switching channels for connection to control-reliable power interrupt circuits and three auxiliary output channels
- Automatic reset or monitored manual reset
- Design complies with standards ANSI B11.19, UL991, ISO 13850 (EN418), and ISO 13849-1 (EN954-1) (Safety Category 4)
- For use in functional stop category 0 applications per ANSI NFPA 79 and IEC/EN60204-1
- 6 amp safety output contacts; 5 amp aux. output contacts
- Plug-in terminal blocks
The purpose of an Emergency Stop Safety Module (E-Stop Safety Module) is to increase the control reliability of an emergency stop circuit. The ANSI B11.19 standard states:
“Control reliability of electrical, electronic, or pneumatic systems frequently consists of multiple, independent parallel or series circuitry or components so arranged that any single failure … either sends a stop command to the machine tool or prevents a successive cycle from being initiated.”
Dual Channel Emergency Stop – Typical Applications
- Interlocked guards, light curtains, laser scanners, safety mats
- Machine input/output signals
Without a safety relay, faults and short circuits in a safety interlock switch can go undetected and can create a hazardous situation. The potential for faults exists in the power supply, relays, and switches as well as their associated wiring.
When using this dual channel emergency stop safety relay, the wiring is monitored and compared. If a failure occurs in one area, it will be detected and a stop signal will be sent to the safeguarded machine.
WARNING: Not a Stand-Alone Safeguarding Device
This device is not a stand-alone point-of-operation guarding device, as defined by OSHA regulations. It is necessary to install point-of-operation guarding devices, such as safety light screens and/or hard guards, to protect personnel from hazardous machinery. Failure to install point-of-operation guards on hazardous machinery can result in a dangerous condition which could lead to serious injury or death.
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