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4.3.3
Operation during interruption of
communication
14
Product description
NOTICE
If the "Operation" function has been selected for EBMs/SBMs, each pump kick ex-
ecuted causes a message to appear for a few seconds.
Operating possibilities at the slave pump
The only settings that are possible at the slave are "External off" and "Disable/enable
pump".
NOTICE
If an individual motor is disconnected from the power supply in dual-pump opera-
tion, the integrated dual-pump management is out of operation.
When communication is interrupted between two pumps in twin-head 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 master (see menu items <5.6.2.0>).
The factory setting for the emergency operation speed is about 60% of the pump's
maximum speed.
ƒ
For 2-pole pumps: n = 1850 rpm
ƒ
For 4-pole pumps: n = 925 rpm
After acknowledging the fault display, the status display will be shown on both pump
displays for as long as communication is interrupted. This resets the ESM/SSM contact
at the same time.
The slave pump display flashes and shows the symbol (
gency operation).
The (former) master pump still follows the control instructions. The (former) slave pump
follows the emergency operation settings. Emergency operation can only be exited by
triggering the factory setting, resolving the interruption in communication or by
switching "mains off/on".
NOTICE
The differential pressure sensor is switched to the master!
During communication interruptions, the (former) slave pump cannot run in control
mode. When the slave pump is running in emergency operation mode, changes can-
not be made to the electronic module.
After the communication interruption has been resolved, the pumps will resume
regular twin-head pump operation, as before the malfunction.
Slave pump behaviour
Exiting emergency operation at the slave pump:
ƒ
Factory settings restored
During a communication interruption on the (former) slave, if emergency 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 Δp-c operating
mode at about half the maximum delivery head.
– Pump running in emer-
WILO SE 2020-10
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