Omron vs Mitsubishi program comparison
SyncroFlo Technical Bulletin
TO: All Representatives
FROM: Service Department
DATE: December 3, 2007
SUBJECT: Comparison Of Operation Of Older Style IronHeart VII and New
Style “FX-97″ IronHearts.
The newer style “FX-97″ PC IronHearts operate a little differently from the older PC IronHearts with a Omron PC. Below is a comparison of the two to aid in understanding the differences.
1. Pump Sequencing Type “A” and “B” Systems
Older Style PC IronHearts IronHeart “FX-97″ PC
A. Lead Pump
Used low set point on a dual set point Use Low System Pressure switch
Mercoid switch to cycle on the lead start lead pump. And a single set pump. And Used the high set point point switch to cycle off the lead
to cycle off the lead pump. pump. Advantage: 5 Psi more storage
pressure and single setpoint for all
pump starts.
B. Lag Pump(s)(Pressure Sequencing)
Type A: Lag pump could sequence on Use Low System Pressure switch to
before Lead pump because lead pump start Lag Pump(s) after Lead Pump is
controlled by a dual setpoint Mercoid already running.
pressure switch. Advantage: Lead pump will always start
Type B: Used Lag Pump pressure first.
switch to cycle on the lag pumps
only if lead pump pressure switch was open.
C. Lag Pump(s) (Flow Sequencing)
Used pulse output from a Data Industrial Flow Sensor connects directly to high
Pulse convertor relay or a Model 1000 speed input of PC eliminating the
flow meter to drive a high speed input on need for any conversion device.
the PC to cycle on pump(s) at programmed Advantage: Flow sequencing is now
set point. digital for maximum accuracy and sensitivity.
D. Sequence Shifting
Manual Alternation is required to correctly Uses automatic sequence shifting,
sequence pumps when one pump is out of simply turn the H-O-A switch of the
service. This is done by setting a manual pump that is out of service to the off
alternation switch so that the pump out of position, the PC automatically chooses
service is the last in the sequence. the new lead pump and reconfigures the pump alternation schedule.
Advantage: No need to set an alternation switch which lessens the chance of operator error.
2. Type “C” Systems
The old and new PC’s operate in similar fashion to their respective A and B types. The lead pump runs continuously and the Lag pumps will cycle on as stated above.
3. Additional Features of the FX-97 PC Type IronHearts.
Special start-up sequencing reduces pressure surges. After power failures, pumps come on line
slowly to test that the pumps are truly needed. During the initial starting of a pump, the time
delay to start a lag pump is automatically extended. This allows the pump that just came online
more time to meet building load and prevents pressure surges by keeping additional pumps from
starting unless required by actual demand. Time delays prevent the lead from cycling during
brownout periods. This also reduces the stress on emergency power equipment.