Wilo STRATOS GIGA, Installation And Operating Instructions Manual, Page: 82 / 265

English
82 WILO SE 03/2018
Operating possibilities at the
slave pump The only settings that are possible at the slave are “Extern off” and
“Disable/enable pump”.
NOTICE:
If an individual motor is switched to a voltage-free state in a double
pump, the integrated double pump management is deactivated.
6.3.3 Operation during interruption of
communication When communication is interrupted between two pump heads in
double pump operation, both displays show the error code “E052”.
Both pumps behave as single pumps for as long as the interruption
lasts.
• Both electronic modules report the malfunction via the ESM/SSM
contact.
• The slave pump runs in emergency operation (constant speed) mode
according to the emergency operation speed previously set on the mas-
ter (see menu items <5.6.2.0>). The factory setting for the emergency
operation speed is about 60 % of the pump’s maximum speed.
• For 2-pole pumps:
n = 1850 rpm
• For 4-pole pumps: n = 925 rpm
• After acknowledging the fault display, the status display will be
shown on both pump displays for the duration of the communication
interruption. This resets the ESM/SSM contact at the same time.
• The slave pump display will show the symbol flashing ( - Pump
running in emergency operation).
• The (former) master pump continues to have control. The (former)
slave pump follows the emergency operation settings. Emergency
operation can only be exited by triggering the factory setting, elimi-
nating the interruption in communication or by switching the mains
off/on.
NOTICE:
During communication interruptions, the (former) slave pump cannot
run in auto control, since the differential pressure sensor has switched
to the master. When the slave pump is running in emergency opera-
tion mode, changes cannot be made to the electronic module.
• After the end of the communication interruption, the pumps will
resume regular double pump operation as before the malfunction.
Slave pump behaviour Leaving emergency operation at the slave pump:
• Factory settings restored
During a communication interruption on the (former) slave, if emer-
gency operation is discontinued because the factory settings have
been restored, the (former) slave will start up with the factory settings
of a single pump. It will then run in
Δ p-c mode at about half the max-
imum delivery head.
NOTICE:
In the absence of a sensor signal, the (former) slave will run at maxi-
mum speed. To prevent this, the (former) master differential pressure
sensor’s signal can be looped through. When the double pump is
operating normally, it is not affected by sensor signals pending on the
slave.
• Mains off/mains on
During a communication interruption on the (former) slave, if emer-
gency operation is discontinued due to mains off, mains on, the
(former) slave will start up with the latest emergency operation set-
tings received from the master (for example, constant speed with
preset speed or off).