Modifiers (2.7.2.) - Siemens SITRANS LUT400 Operating Instructions Manual

Service Ratio Pump 1 (2.7.1.10.)
Selects pump usage based on the RUN time ratio rather than last used. (See Run Time
Relay 2 (3.2.7.1.) (Page 243).)
Values
This parameter only relates to relays with Pump Control Mode (2.7.1.4.) (Page 185) set to
Service Ratio Duty Assist or Service Ratio Duty Backup.
The number assigned to each pump relay represents the ratio applied to decide the next
pump to start or stop.
Note
• The SITRANS LUT400 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 (default).
Service Ratio Pump 2 (2.7.1.11.)
Selects pump usage based on the RUN time ratio rather than last used. (See Run Time
Relay 3 (3.2.7.2.) (Page 244).)
Values
This parameter only relates to relays with Pump Control Mode (2.7.1.4.) (Page 185) set to
Service Ratio Duty Assist or Service Ratio Duty Backup.
The number assigned to each pump relay represents the ratio applied to decide the next
pump to start or stop.
Note
• The SITRANS LUT400 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 (default).
9.2.7.2

Modifiers (2.7.2.)

Note
Default settings in the parameter tables are indicated with an asterisk (*) unless explicitly
stated.
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
Range: 0 to 255
Default: 1
Range: 0 to 255
Default: 1
187