CWSI CP-3000A, Быстрый старт

Страница: 24 / 35

23
A GUIDE TO FIRE PUMPS, CONTROLLERS, AND MONITORING REQUIREMENTS
NFPA-20 covers Fire Pumps, including fire pump controllers:
Chapters 10 & 12 cover Electric Motor Driven and Diesel Engine Driven Fire Pump Controllers
respectively. Chapter 10 also covers Fire Pump Transfer Switches.
For required controller alarm contacts see sections:
10.4.7* Fire Pump Alarm and Signal Devices Remote from Controller.
10.8.3.12.1 The alternate isolating switch and the alternate circuit breaker (if installed) shall be
monitored to indicate when one of them is in open or tripped position, as specified in 10.8.3.12(3).
10.8.3.14 Remote Indication. Auxiliary open or closed contacts mechanically operated by the fire
pump power transfer switch mechanism shall be provided for remote indication in accordance with
10.4.8.
10.4.8 Controller Contacts for Remote Indication. Controllers shall be equipped with contacts (open or
closed) to operate circuits for the conditions in 10.4.7.2.1 through 10.4.7.2.3 and when a controller is
equipped with a transfer switch in accordance with 10.4.7.2.4.
Variable speed controllers have additional contacts to be monitored:
10.10.8 Indicating Devices on Controller.
10.10.8.1 Drive Failure. A visible indicator shall be provided to indicate when the variable speed drive
has failed.
10.10.8.2 Bypass Mode. A visible indicator shall be provided to indicate when the controller is in
bypass mode.
10.10.8.3 Variable Speed Pressure Limiting Control Overpressure. Visible indication shall be
provided on all controllers equipped with variable speed pressure limiting control to actuate at 115
percent of set pressure.
10.10.9 Controller Contacts for Remote Indication. Controllers shall be equipped with contacts (open
or closed) to operate circuits for the conditions in 10.10.8.
Diesel Fire Pump Controllers:
12.4.1.3 Separate visible indicators and a common audible fire pump alarm capable of being heard
while the engine is running and operable in all positions of the main switch except the off position shall
be provided to immediately indicate the following conditions:
(1) Critically low oil pressure in the lubrication system. The controller shall provide means for testing
the position of the pressure switch contacts without causing fire pump alarms.
(2) High engine jacket coolant temperature.
(3) Failure of engine to start automatically.
(4) Shutdown from over-speed.
12.4.3 Controller Contacts for Remote Indication. Controllers shall be equipped with open or closed
contacts to operate circuits for the conditions covered in 12.4.2. These are the minimum required
alarm contacts. Numerous others may be supplied as options to the controllers.
Authored by and thanks to: James S. Nasby, President ,Columbia Engineering
847-677-3468 -- FAX 847-677-8317 www.columbia-engineering.net