Rockwell Automation 1606-XLP XM Electronic Overspeed Detection System - Manual (Page 8)

Publication GMSI10-UM015B-EN-E - June 2011
8 Introduction
The XM EODS is comprised of the following components:
• Two Allen-Bradley™ 1606-XLP30E Power Supplies - The two power
supply modules (85 - 264 VAC input, +24V DC output) provide
redundant power to the EODS. Each power supply is independently
capable of supplying power for the entire system. If one of the power
supply modules fails, the system will continue to operate properly.
• Three XM-220 Dual Speed modules - The three XM-220 modules
individually accept input signals from a proximity probe transducer or
magnetic pickup. Each module measures the speed of the transducer
and compares it against a user-defined danger threshold value. The
modules also record the highest measured speed.
The XM-220 modules include an overspeed/circuit fault output signal,
which is wired to the XM-442 module, as shown in Figure 1.1. If the
XM-220 senses an overspeed condition or detects a failed speed sensor
or logic device, it will activate its overspeed/circuit fault output signal.
Channel 1 of each of the XM-220 modules serves as the overspeed
channel of the electronic overspeed detection system. The on-board
relay in each of the XM-220 modules serves as the circuit fault relay for
that overspeed channel. The XM-220 modules also include two 4-20mA
outputs and a buffered output for each input channel.
For more information about the XM-220, refer to the XM-220 Dual
Speed Module User Guide.
• XM-442 EODS Relay module - The XM-442 module provides the
two-out-of-three or one-out-of-three voting logic. The module includes
four high power relays that serve as the EODS alarm and shutdown
relays.
The XM-442 module accepts the overspeed/circuit fault outputs from
the three XM-220 modules. If at least two of the three overspeed/circuit
fault outputs are active, the XM-442 module activates the three
shutdown relays. If at least one of the three overspeed/circuit fault
outputs is active, or there is failure of a logic device in the XM-442 or a
failure of a power supply, the XM-442 activates the alarm relay. Note
that the shutdown relays are not affected by a single power supply failure
or a circuit fault within the XM-442 module. The XM-442 contains
redundant logic which allows it to operate correctly even in the presence
of a single internal circuit fault.
The EODS modules include LED indicators for indicating power failures,
alarm and shutdown status, and circuit faults. The XM-442 module has no
configurable parameters. The XM-220 module can be configured remotely via
the DeviceNet network, or locally using a serial connection to a PC or laptop.