3
95-8723
3.4
Appendix A - FM
Appendix B - CSA
Appendix C - IECEx
Appendix D - Additional Approvals
OPERATION
WARM UP
When the detector is initially powered up, a warm-
up period of one – two seconds is allotted for
internal checks and communication. During this
time, the LED is off and the current level is 3 mA.
After the checks are completed, normal operation
will be indicated by the LED flashing every four
seconds (current level is 4 mA).
If the detector is unable to reach the normal
operating mode, the warm-up period may extend
to five seconds, followed by a critical fault or an
advisory fault (see Table 1 for all current levels).
If the problem persists, check for any loose wiring
connections, ensure that the voltage supply is
sufficient, and cycle power if necessary.
OUTPUTS
Relays
The U5015 detector is furnished with smoke
alarm, fault, and auxiliary relays. All three
relays are rated to 5 amperes at 30 Vdc.
The smoke alarm relay has a single set of
terminals and normally open / normally closed
contacts, and normally de-energized operation.
The fault relay has a single set of terminals
and normally open contacts, and normally
energized operation.
The auxiliary relay has a single set of terminals
and normally open / normally closed contacts,
and normally de-energized operation.
IMPORTANT
The auxiliary relay functions as pre-alarm.
0 to 20 mA Output
The U5015 provides a 0 to 20 mA dc current for
transmitting detector status information to other
devices. The circuit is wired in a non-isolated
configuration and can drive a maximum loop
resistance of 300 ohms from 12 to 17.9 Vdc, 500
ohms from 18 to 19.9 Vdc, and 600 ohms from
20 to 30 Vdc. Table 1 defines the current levels
and corresponding detector status. The output
is calibrated at the factory, with no need for field
calibration.
NOTE
The output of the 0 to 20 mA current loop
is monitored by the fault detection circuitry
of the U5015. Therefore, an open circuit on
the loop will cause the fault relay to change
state.
An alarm will normally over-ride a fault, unless
the nature of the fault impairs the ability of
the detector to generate or maintain an alarm
output (i.e., loss of operating power).
Figure 2—U5015 Dimensions in Inches (cm)
4.99 (12.67)
B2680
7.55 (19.18)
2X 3.80 (9.65)
6X R0.19
2X 1.75
(4.44)
2X 2.25 (5.71)
3.75 (9.52)
4X 1.29 (3.27)
2X 2.50 (6.35)
7.55 (19.18)
Table 1—Detector Status Conditions Indicated by Current Level
Current Level (±0.3 mA)
Detector Status
0 mA
Power Fault
1 mA
Critical Fault
2 mA
Power Advisory (<12 Vdc)
3 mA
Warm up
4 mA
Normal
6 mA
Advisory Fault
16 mA
Pre-Alarm
20 mA
Smoke Alarm
