Expansion Modules; Relay Module; Geni Module; Control Of Twin-Head Pumps - Grundfos MAGNA 2000-Serie Montage- Und Betriebsanleitung

7.7 Expansion modules

The pump can be fitted with an expansion module
enabling communication with external signals
(signal transmitters).
Two types of expansion modules are available:
•

Relay module

•

GENI module.

Twin-head pumps are always fitted with GENI
modules.
Connection examples (GENI module) can be found
on pages 295 and 296.
7.8 Relay module
For mounting and operation, see separate
installation and operating instructions for the relay
module.
Functions
• External start/stop
• Fault, ready and operating indication via signal
relay.
7.9 GENI module
For mounting and operation, see separate
installation and operating instructions for the GENI
module.
Functions
• External start/stop
• External forced control
• External analog 0-10 V control
• Bus communication via GENIbus
•

Control of twin-head pumps

• Fault, ready and operating indication via signal
relay.
16
7.9.1 Control of twin-head pumps
Twin-head pumps are supplied fitted with a GENI
module on each control box. The modules are
connected via a cable.
Left pump head
(slave)
Flow direction
Cable
Fig. 8 Twin-head pump with GENI modules
For connection of the communication cable between
the GENI modules, see pages 295 and 296.
The communication between the control box and the
GENI module is wireless.
Twin-head pumps are factory-set to the control mode
AUTO and the operating mode "alternating
ADAPT
operation", which is described below.
Operating modes:
• Alternating operation
Pump operation alternates every 24 hours. If the
duty pump stops due to a fault, the other pump
will start.
• Standby operation
One pump is operating continuously. In order to
prevent seizing-up, the other pump will start at a
fixed frequency and run for a short period. If the
duty pump stops due to a fault, the other pump
will start.
In air-conditioning systems, standby
Note
operation is recommended to avoid
critical condensation inside the pump.
Right pump head
(master)