Edwards E-RLY Modules Connected to MR Series Multivoltage Control Relays

Notes Bulletin E C H N I C A L S U P P O R T N N 1 0 0 2 1 E I S S 0 7 S E P 1 0 E RLY Modules Connected to Series Multivoltage Control Relays bulletin informs you of an issue with E RLY modules connected to MR Multivoltage Control Relays and tells you how to resolve it to a change by Air Products the 120 VAC input circuits on MR 100 200 800 Series Multivoltage Control Relays present a capacitive load to the E instead of a resistive load As a result the E RLY contacts do not reliably state when activated even though the red LED turns on E RLY is not affected when using the 24 V input control voltages on the relay 1 on page 2 shows the difference between new board layouts with and old board layouts without capacitors We are attempting to find when Air Products changed their product design Until then use Figure 1 on 2 to determine if this change affects you Other Signature modules that have contacts rated for 120 VAC at 500 mA Duty inductive or resistive loads only may also be affected Typically the module is used in this type of application In addition other control relays as the PAM 1 may be affected 10021E ISS 07SEP10 of 4 1 Old and new MR Series Multivoltage Control Relays you are using E RLY modules to transfer 120 V in order to energize MR Series Control Relays determine if the MR Series Multivoltage Control have capacitors as shown in Figure 1 If they do we recommend that you one of the following Eliminate the MR Series Multivoltage Control Relay by controlling the 120 V with the E RLY provided the load meets the contact ratings for the E Use 24 VDC from the nearest existing power supply to energize the MR Multivoltage Control Relay Use 24 VAC to energize the MR Series Multivoltage Control Relay This the addition of a 24 VAC power source that is UL ULC Listed for fire signaling services Note If you use this option the relay will not be in the event of a power failure installations where it isn practical to install a 24 VDC power supply or run wiring from an existing power source we recommended using a Model 592 Voltage Class 2 Signaling Transformer from Edwards Signaling to step the VAC down to 24 VAC See Figure 2 and Figure 3 on page 3 Model 592 transformer mounts directly onto an MR 101 enclosure If you to mount the Model 592 transformer into a two gang electrical box you to use a Model 593 mounting bracket Both the transformer and the bracket may be purchased through Customer Service more information on the Model 592 Low Voltage Class 2 Signaling visit www edwards signals com 10021E ISS 07SEP10 of 4 2 Model 592 transformer mounted onto an MR 101 COM NO 115 240 3 24 VAC wiring diagram 592 VAC VAC 6 7 0 5 10021E ISS 07SEP10 of 4 The MR Series relay shown in Figure 3 is energized Activating the module in this configuration de energizes the MR Series relay loads with unknown electrical characteristics or 120 VAC current exceeding ma we recommend using 24 VAC as the input control voltage you have further questions regarding E RLY applications please contact Support at the number listed below support Fire Security Town Center Parkway FL 34202 800 336 4206 860 793 5188 signaling techsupport fs utc com 10021E ISS 07SEP10 of 4