P/N IM-520/MH Rev. E
7
© 2017 Johnson Controls. All rights reserved. All specifications and other information
shown were current as of document revision date and are subject to change without notice.
need to be replaced with a new one to reset the lowbattery2 trouble. Always wait 20
seconds between removing and installing any battery in the 520/MH.
5. Reinstall the front cover onto the mounting base by inserting the bottom tabs into the slots
in the back box then hinge the front cover closed. Secure the front cover to the back the
closing screws.
8. Perform the alarm test as described in this manual.
9. Remove the panel from test mode.
Power Up Reset:
The Models 520/MH will report this trouble within 30 seconds when powered up. This is
normal. If a power up reset occurs any time after the initial indication then the transmitter is
malfunctioning. Replace the unit.
Test Failure:
The Model 520/MH transmits a periodic test signal to the control panel. This trouble condition
will be displayed within 200 seconds on the control panel if it does not receive the test
transmission. The sounder may be out of reception range of a repeater or control panel or
may have an internal problem. Perform the signal test described in this manual to determine
if there is a reception problem. Note: This trouble is self-restoring on CP-3500D or newer
FACP
’s.
Tamper:
The 520/MH contains a built in tilt switch that will cause a Tamper signal to be transmitted if
the front cover of the sounder is removed. A tamper signal is transmitted and repeated every
90 seconds until the front cover is put back into position. Where more than one type of trouble
exists, all will be repeated in increments of 90 seconds. Note: The tamper trouble is self-
restoring on CP-3500D or newer FACP
’s.
EOL/Config:
The 520/MH monitors correct setting of the master/slave jumper as well as unit to unit
interconnecting wiring integrity. If either the J11 jumper setting is incorrect or wiring integrity
is compromised then this trouble will be present on the control panel. When the trouble is
caused by incorrect J11 position then the jumper setting should be corrected and the RF
battery will need to be removed and reinstalled to correct the trouble. If the trouble is due to
a wiring fault then simply fixing the fault will restore the trouble on the control panel.
Always
wait 20 seconds between removing and reinstalling a battery in the 520/MH.
Hardware Fault
The 520/MH monitors the sounder driver circuit output voltage. An insufficient output
voltage from this circuit could result in reduced dBA sound output. A hardware fault trouble
will be displayed. Sound may not be emitted from the unit when this trouble is present as
the voltage is insufficient to produce the correct sound. A severely low sounder driver
battery may produce this trouble if left unchanged after the initial lowbattery2 signal was
sent and an alarm occurs.
