Modifiers (2.8.2.) - Siemens HydroRanger 200 HMI Operating Instructions Manual

Parameter reference
8.6 Setup (2.)
Positive logic
In software, all relays are programmed the same way, with ON setpoints indicating when to
change the relay contact state (open or closed). This parameter allows the reversal of the
operation so that relay contacts can be Normally Closed or Normally Open. Relay Logic
(2.8.1.11.) is preset to Positive logic.
Negative logic
When Relay Logic (2.8.1.11.) = Negative logic, the operation for the indexed relay is
reversed from normal.
Service ratio (2.8.1.12.)
Selects pump usage based on the RUN time ratio rather than Last used.
Index
Values
Related
This parameter only applies to relays with Relay Function (2.8.1.4.) (Page 195) = Service
Ratio Duty Assist or Service Ratio Duty Backup.
To make this parameter useful, assign it to all of the pump relays. The number assigned to
each pump relay represents the ratio applied to decide the next pump to start or stop.
Note
• The device 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).
8.6.8.2

Modifiers (2.8.2.)

Provides alternate ways of starting the pumps in the pump group.
200
Relay
Range: 0.000 ... 9999
Preset: 20.000
Relay function (2.8.1.4.) (Page 195)
HydroRanger 200 HMI
Operating Instructions, 06/2018, A5E36281317-AC