Operating Modes; Behaviour In Twin-Head Pump Operation - Wilo Stratos GIGA Einbau- Und Betriebsanleitung

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Fig. 10: Insert IF module
6.4.1

Operating modes

6.4.2 Behaviour in twin-head pump op-
eration
Δp
Pump 1 Pump 2
Fig. 11: Pump cycling, schematic representa-
tion
102
Interface module (IF module)
An IF module (accessories) attached in the terminal room is required for communication
between pumps and building management systems.
Communication between the main pump and the partner pump is via an internal interface
(terminal: MP).
For pumps in Y-pipe applications where the electronic modules are connected to each other
via the internal interface, only the main pumps require an IF module.
Communication
PLR / Interface converter
LONWORKS network
BACnet
Modbus
CAN bus
Table 3: IF modules
NOTICE
The procedure and additional explanations on commissioning and config-
uring the IF module on the pump are described in the installation and op-
erating instructions for the IF module used.
Main/standby operation
Only one pump ever runs at a time. Each of the two pumps provides the configured flow
rate. The other pump is available in case of malfunction or runs after pump cycling.
Pump cycling
With twin-head pump operation, pump cycling occurs periodically (the intervals can be set;
factory setting = 24 hours).
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 beam on the "AUX" contact
• Manual (menu <5.1.3.1>)
Manual or external pump cycling is possible 5 seconds after the last pump cycling at the
earliest.
t
Activating external pump cycling simultaneously deactivates internal time-controlled pump
cycling.
Schematised description of pump cycling operation (see diagram):
• Pump 1 is running (black line)
• Pump 2 is switched on at minimum speed and soon afterwards reaches the setpoint (grey
line)
• Pump 1 is switched off
• Pump 2 continues to run until the next pump cycling
NOTICE
In constant speed mode, a slight increase in flow can be expected. Pump
cycling is dependent on the ramp time and generally lasts 2 sec. In control
mode, there may be minor fluctuations in the delivery head. However,
pump 1 adjusts itself to the changed conditions. Pump cycling is depend-
ent on the ramp time and generally lasts 4 sec.
Installation and operating instructions • Wilo-Stratos GIGA, Wilo-Stratos GIGA B • Ed.01/2023-05
Main pump
IF module PLR
IF module LON
BACnet IF module
Modbus IF module
IF module CAN
Partner pump
No IF module necessary
No IF module necessary
No IF module necessary
No IF module necessary
No IF module necessary