Earthquake Unit

Model EQ

Advanced relay logic for seismic and counterweight displacement recognition

When elevator owners in earthquake-prone areas need to modernize their elevator systems to meet ASME/ANSI A17.1 earthquake code requirements, they discover that custom-built retrofit solutions tend to be exceedingly complex and labor-intensive. Electrodyn’s Earthquake Unit Model EQ is an efficient and economical alternative.

Model EQ provides two levels of safety—dual inputs capture seismic activity and/or counterweight displacement situations. Depending on the type of signals received, the unit will either return the car to a safe landing or signal a slam stop, as appropriate. In addition, in the event of counterweight derailment, intelligent logic moves the car away from the counterweight.

Key features:

• Compatible with a wide range of controller types.
• Relays are 4-pole type with neon indicator displays. A 5-amp contact rating ensures durability.
• A smart interface design speeds installation and reduces downtime.
• Accepts both seismic and counterweight displacement signals.
• Built-in manual reset.
• Onboard power supply to activate sensors.
• C.S.A. certified (CAN/CSA-B44.1/ASME-A.17.5)

Interface

Interface relays in the Model EQ are matched to the control voltage and isolated from logic circuits. Installation is accomplished through a series of parallel and series connections between the Earthquake Unit and the host controller.

The Earthquake Unit provides a wide range of dry contact configurations to produce the required functionality regardless of controller logic. Two sets of normally opened dry contacts activate the system. One set is provided by the seismic device, the other from the counterweight displacement device. Once either device is closed, even momentarily, the Model EQ requires manual resetting per ANSI code requirements.

Model EQ is only one of Electrodyn’s many innovative products to help you modernize your elevator system. Our technical support and application team is always available and our excellent service support is just a free phone call away. Choose Electrodyn: we work with you when you have work to do!