Siemens PAD-3-MB (500-699080) — main board for the Siemens Model PAD-3 distributed power module, a notification appliance circuit power expander.
The PAD-3 provides up to 6 A of 24 VDC for notification appliances and auxiliary devices, with its own AC power connection, battery charging circuit and battery connections. Two optically isolated inputs follow the polarity of the control unit's NACs, and the module reports trouble back by opening the NAC's end-of-line supervision, so the control unit supervises it like an ordinary NAC.
Specifications
| Model |
PAD-3-MB, 500-699080 |
| Total output |
6 A at 24 VDC |
| NAC outputs |
4 power-limited, 3 A each; four Class B (Style Y) or two Class A (Style Z) |
| Auxiliary output |
3 A, non-resettable or switched off on AC loss |
| Inputs |
2 optically isolated NAC inputs |
| Primary input |
120 VAC, 50/60 Hz nominal |
| Battery capacity |
7 to 15 AH |
| Relays |
Common trouble and AC fail |
Installation notes
- Outputs can follow the inputs, or run ANSI temporal code or synchronized strobe/horn operation.
- Trouble is reported for low or no AC, low or no battery, ground fault, auxiliary overcurrent and NAC open, short or overcurrent.
- DIP switches set the input/output configuration, auxiliary output mode and AC fault reporting delay.
- The auxiliary output may be limited to 1.5 A depending on the battery calculation.
Related models
- PAD-3 is the complete distributed power module.
- PAD-4-MB and PAD-5-MB are the main boards for the PAD-4 and PAD-5 models.
Documents
FAQ
Is this the complete PAD-3?
No. PAD-3-MB (500-699080) is the main board used in the PAD-3 series; the PAD-3 is the complete power module.
How much current can it supply?
Up to 6 A total at 24 VDC. Each of the four NAC outputs is rated 3 A and the auxiliary output 3 A, within the 6 A total.
Does it support Class A wiring?
Yes. The four NAC outputs can be configured as four Class B (Style Y) circuits or two Class A (Style Z) circuits.
What batteries does the PAD-3 use?
The manual specifies 7 to 15 AH, sized with the battery calculation in Section 6.2.
