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99B-MI Standard Control

99B-MI Standard Control Installation 99B-MI Standard Control Rendering
Standard Control

The Type 99B Tower Clock Controller is a microprocessor-based master clock that provides completely automatic control of Electric Time minute impulse (MI) clocks & 24 VDC (RP) reverse polarity clock movements.

- Provides "Minute Impulse" (MI) Control (clock hands index from one minute to the next)
- Automatically resets clocks after power failures (resets at 6x speed)
- Automatically resets clocks for daylight savings time (if required)
- Precision Quartz Time Based
- Optional GPS interface for ultimate time keeping accuracy
- 10 year battery backup for time base
- For indoor or outdoor use
- Protected to IP65
- ETL listed to UL 863, Seventh Edition & CAN/CSA C22.2 No. 6-M1984

Westminster Chime & Hour Strike available

99B-OPT board available to provide outputs for other clock system.

If your controller was purchased without the 2007 daylight saving rules - contact us for a software update.


DS 483 Product Data Sheet (PDF File)
M274 Operation Installations (PDF File)
M274C Chime Operation (PDF File)
Wiring Diagram (AutoCad Release 12)