Siemens 200 instruction manual Rotating Pumps by Service Ratio MR, Single and Dual Point MR, Time

Pump Control

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 [MR 200]

•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 [MR 200]

Prerequisite: Set pump relays to a service ratio value (P111 = 54 or 55).

Parameter	Index	Value	Description
P122	1	1	These values will start Pump Two 50% of the
P122	2	2	time and Pumps One and Three each 25% of
P122	3	1	the time.

Notes:

•The MultiRanger 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.

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