The multi-pump control function based on the PID control system allows the drive to control up to 2 additional pumps or fans. The entire system consists of a pump controlled by a frequency converter and up to 2 additional pumps/fans controlled via contactors or motor starters. The contactor or motor starter is controlled via the digital output of the frequency converter.
The main wiring diagram is shown in the attached drawing.
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2. What parameters need to be set?
P2370[0...2] Cascade Control Stop Mode When using multi-pump control, this parameter selects the stop mode of the external motor.
= 0: Normal shutdown (factory default)
= 1: Sequential shutdown
P2371[0...2] Cascade control configuration This parameter selects the configuration for the external motor (M1, M2) in cascade control.
= 0: Prohibit multi-pump control
= 1: M1 = 1 x MV, M2 = not installed
= 2: M1 = 1 x MV, M2 = 1 x MV
= 3: M1 = 1 x MV, M2 = 2 x MV
P2372[0...2] Multi-Pump Control Cycle This parameter enables the motor cycle under multi-pump control.
= 0: Disabled (factory default)
= 1: Enabled
P2373[0...2] Multi-Pump Control Hysteresis [%] P2373 is the percentage of the PID setpoint which must exceed the PID error P2273 before the pump delay is started. Range: 0.0 to 200.0 (factory default: 20.0)
P2374[0...2] plus pump delay [s] This parameter defines the delay before the start of pump addition. PID error P2273 must exceed the multi-pump control hysteresis P2373 before this.
Range: 0 to 650 (factory default: 30)
P2375[0...2] Decrease pump delay [s] This parameter defines the delay time before the start of pump reduction. PID error P2273 must exceed the multi-pump control hysteresis loop P2373 before this.
Range: 0 to 650 (factory default: 30)
P2376[0...2] plus pump delay override [%] P2376 is the percentage of PID setpoint. When the PID error P2273 exceeds this value, the pump up/down pump is not related to the delay timer. Range: 0.0 to 200.0 (factory default: 25.0) Note: The value of this parameter must always be greater than the multi-pump control hysteresis loop P2373.
P2377[0...2] Cascade Control Off Timer [s] This parameter defines the time to prevent delayed override after adding or subtracting the pump. Range: 0 to 650 (factory default: 30)
P2378[0...2] Multi-pump control frequency f_st [%] This parameter sets the frequency of the digital output (DO) switch at pump up/down, and the inverter runs from the maximum frequency ramp to the minimum frequency (or vice versa). ). Range: 0.0 to 120.0 (factory default: 50.0)
R2379.0...1 CO / BO: Multi-pump control status word
This parameter displays the output word for multi-pump control, which facilitates external connections.
Bit 00: Start motor 1 (1: Yes; 0: No)
Bit 01: Start motor 2 (1: Yes; 0: No)
P2380[0...2] Multiple pump operating hours [h] This parameter shows the number of hours the external motor is operating.
Subscript:
[0]: Motor 1 operating hours
[1]: Motor 2 hours
[2]: Unused range: 0.0 to 4294967295 (factory default: 0.0)
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SIEMENS/Siemens Inverter Repair Center/Maintenance Service: 24H Service Hotline: 15800462088
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