Operating Modes - salmson LRE Serie Manual De Instalación Y Puesta En Servicio

6.3.1 Operating modes

Main/standby mode
Parallel operation
H
H
max
H
s
s
H
min
Fig. 14: Δp-c control (parallel operation)
H
H
H
max
H
s
H
min
Fig. 15: Δp-v control (parallel mode)
6.3.2 Behaviour in dual pump operation
Pump cycling
Behaviour of the inputs and outputs
Installation and operating instructions LRE-JRE
Each of the two pumps provides the configuration flow rate. The
other pump is available in case of malfunction or runs after pump
cycling. Only one pump runs at a time (see Fig. 10, 11 and 12).
In the partial load range, the hydraulic output is provided at the
beginning by one pump. The second pump will be switched on when
it is most effective to do this, i.e. when the total power consumption
P of both pumps in the partial load range is less than the power con-
1
sumption P
adjusted upwards to the maximum speed. (Fig. 14 and 15).
In manual control mode, both pumps always run synchronously.
See Section 6.4 "Other functions" on page 60.
Q
Q
Q
In dual pump operation, pump cycling is done every 24 hours (config-
urable).
Pump cycling can be triggered:
• Internally, time-controlled (menu <5.1.3.2> + <5.1.3.3>),
• Externally (menu <5.1.3.2>) by a positive edge at the "AUX" contact
(see Fig. 19),
• Manually, (menu <5.1.3.1>).
Manual or external pump cycling is possible 5 seconds after the last
pump cycling, at the earliest.
Activation of external pump cycling simultaneously deactivates
internal time-controlled pump cycling.
Actual value input IN1 setpoint input IN2
• At the master: acts on the whole unit.
"External Off"
• Set at the master (menu <5.1.7.0 >): depending on the setting in
menu <5.1.7.0 >, acts only on the master or on the master and the
slave.
• Set at the slave: acts only on the slave.
of one pump. Both pumps will then be simultaneously
1
English
58