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- for -
F.M. Approvals- by -
James S. Nasby
Columbia Engineering
Motor Drive Controller Functions and Operation
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C.E. F.M. Approvals 2
Topics Covered Type of Controller
Manual Combined Automatic
Measurement Timing Remote Functions
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C.E. F.M. Approvals 3
Type of Controller Manual Only Controller
Peerless "Mantrol" was U.L. Listed Most F.P. Engine Panels do this
Automatic Controller Must be both A Manual Controller -and- An Automatic Controller
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C.E. F.M. Approvals 4
Timing Cranking Delayed Starting: Which Demands?
Sequence Start: Static Demands• Pressure (Weekly Test)• Deluge• A.C. PF Start
Don’t Delay• Remote Momentary Switch (Push Button)
High Zone Start - Which Demands Static Demands -and- Remote Momentary (Don't Want to Start a Dry or
Cavitating Pump)
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C.E. F.M. Approvals 5
Non-Standard Functions Start Timing
Sequential (Parallel Pumps)• Which Demands are Delayed?
High Zone Delay (Pumps in Series)• Which Demands are Delayed?
Lockout - When OK?
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C.E. F.M. Approvals 6
Additional Functions Breaker Test Switch Re-Start Delay Avoids Re-closing Contactor with Motor
Back EMF present Will almost Always be Out of Phase 3/4 to 1-1/2 Seconds "Open Circuit Magnetic Time Constant"
for Induction Motors. Delay of 2 to 3 Seconds = One or More Time Constants (63%
Drop) to Safe Levels Single Phase Protection Shunt Trip
A.C. Powered = 1/3 Odds of Tripping D.C. Powered = Better Odds Triple Redundant CPTs & D.C. Powered = Best Odds of
Tripping.
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C.E. F.M. Approvals 7
A Very Large Military SiteVariable Speed Motor, Engine and Jockey Pump
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C.E. F.M. Approvals 8
Voltage Margins Low Line Performance
During Motor Starting (Weak Source)• 15% Minimum• 35% Better
Stand-by - High Line• 480 x 110% = 528*
Affect on Function Metering
*Can be Even Higher for Service Entrance Equipment due to Close Proximity to the Building Transformer which might have Taps set to Compensate for Long Wire Runs.
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C.E. F.M. Approvals 9
Questions?