Rotating Pumps By Service Ratio [6 Relay Model] - Siemens HydroRanger 200 Instruction Manual

When the first ON setpoint is reached, the pumps will start, one by one, until the material
level rate of change is set at the same value or greater than the value in:
• P703 – Emptying Indicator (pump down applications)
• P702 – Filling Indicator (pump up applications)
Set delay between pump starts using P132 – Pump Start Delay.
Single and Dual Point [6 relay model]
• Single Point Mode: one pump by rate control available that affects all pumps.
• Dual Point Mode: a single pump by rate control can be set up for each of the three
available level points. Set Operation for difference or average (P001 = 4 or 5).
Notes:
• Set all pump control relay ON and OFF setpoints to the same value
• If the level is within 5% of Span (P007) of the OFF setpoint, then the next pump
is not started

Rotating Pumps by Service Ratio [6 relay model]

Prerequisite: Set pump relays to a service ratio value (P111 = 54 or 55).
Parameter
P122
P122
P122
Notes:
• The HydroRanger 200 will not sacrifice other pumping strategies to ensure that
the ratio is held true
• If the pump relays are set to the same value, then the ratio equals 1:1 and all
pumps are used equally (preset)
When more than one pump is assigned a Pump Service Ratio value (in any time units) and a
pump start is required (P112 Relay Setpoint ON), the pump with the fewest running hours (with
respect to the assigned ratio values) starts.
Conversely, when a pump stop is required (113 Relay Setpoint OFF), the pump with the
most running hours (as compared to the assigned ratio values) stops.
Page 62
Index Value Description
1 1
2 2
3 1
HydroRanger 200 – INSTRUCTION MANUAL
These values will start Pump Two 50% of the
time and Pumps One and Three each 25% of
the time.
7ML19985FC03