Rockwell Automation 1606-XLP XM Electronic Overspeed Detection System - Manual (Page 32)

Publication GMSI10-UM015B-EN-E - June 2011
32 Installing the XM Electronic Overspeed Detection System
Connecting the Overspeed/Circuit Fault Signals
The XM-442 module accepts one discrete digital input signal from each of the
three XM-220 modules. If the XM-220 detects an overspeed condition or a
circuit fault condition (failure of a sensor connected to, or logic device in, the
XM-220), it will activate this signal. The 1-out-of-3 or 2-out-of-3 voting logic is
determined by the number of active overspeed/circuit fault signals.
Wire the XM-220 overspeed/circuit fault connections to the XM-442 terminal
base as shown in Figure 2.10.
Figure 2.10 Overspeed/Circuit Fault Signal Connections
Connecting the Relays
The XM modules have both Normally Open (NO) and Normally Closed (NC)
relay contacts. Normally Open relay contacts close when the control output is
energized. Normally Closed relay contacts open when the control output is
energized.
All XM relays are double-pole, double-throw type relays. This means that each
relay has two contacts in which each contact operates independently but
identically. The following information and illustrations show wiring solutions
for both contacts; although, in many applications it may be necessary to wire
only one contact.
+
-
IMPORTANT
The NC/NO terminal descriptions correspond to a
de-energized (unpowered relay). When the relay is
configured for failsafe operation, the relay is normally
energized, and the behavior of the NC and NO terminals is
inverted.