APG KA Cable Suspended user manual - Manual (Page 12)

KA Series Rev. A2, 12/08
12
Automation Products Group, Inc.
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• Duplex Pump Control Circuit (Using Type 4H5E)
Alarm Bell or Light
Alarm
Power
Line
Power
R1B
R2B
Pump Alternator
Power to
Lead Pump
Power to
Lag Pump
R1
R2 R2A
High Alarm
Point
Lag Pump (#2)
ON
Lead Pump (#1)
ON
Both Pumps
OFF
4 5
1 3
1 2
Note: Usually an alternator control is added to the lead and lag pump control circuits. This
control automatically alternates the order in which the two pumps come on. In this way the wear
on the pump is evened out. If this is not done, in the course of time, the user will have one (lead)
pump that is well worn and one (lag) pump that is barely used. If the pumps use three phase
power, the single pole switch contacts, R1B and R2B, would need to be heavy duty three pole
switch contacts.