LDM-32F PN 50055:C 03/20/01
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5. Electrical Ratings and Current
Calculations
Lamp Driver Electrical Ratings
LDM modules may use either 24 VDC (regulated) or internal 5 VDC for
powering connected LEDs. 5 volt usage conserves power but is limited in the
current available to drive the LEDs. Refer to "Wiring for Lamp/LED" on page
23 for connection illustrations.
Table 2 Power Limitations
Note:
The LDM-32F drives 32 LEDs and each LDM-E32F drives 32 more LEDs. An LDM
system configured for Alarm and Trouble Display Mode and employing three expanders
could have as many as 128 LEDs, all of which are activated during Lamp Test.
Maximum Current per Driver:
100 mA
(external circuit must limit current)
Maximum Voltage rating per output driver:
30 VDC
Supervised circuit (typical rating):
5 volts DC @ 0.5 mA
Bipolar Darlington Open Collector NPN Transistor
Supervision of LDM points
Any LEDs or lamps connected to the LDM-32F or LDM-E32F are not
supervised for failure. Therefore, all LEDs or lamps, must be located in the
same room as the LDM modules.
5 Volt LED Power Limitations
LED Current
Desired (mA)
Max Number
of LEDs
Number of Modules
LDM-32F LDM-E32F
2
130
1
3
5
66
1
1
10
34
1
0
Summary of Contents for LDM-32F
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Page 16: ...1 Introduction Related Documentation 16 LDM 32F PN 50055 C 03 20 01 NOTES...
Page 28: ...3 Operation Graphic Annunciator Lamps LEDs 28 LDM 32F PN 50055 C 03 20 01 NOTES...
Page 30: ...4 LDM Communications Receive Transmit LDM 32F 30 LDM 32F PN 50055 C 03 20 01 NOTES...
Page 50: ...Appendix B MS 9200 Configuration 50 LDM 32F PN 50055 C 03 20 01 NOTES...
Page 61: ...LDM 32F PN 50055 C 03 20 01 61...
Page 62: ...62 LDM 32F PN 50055 C 03 20 01...