Operating Modes - Wilo Rexa PRO Notice De Montage Et De Mise En Service

4.3

Operating modes

Installation and operating instructions Wilo-Rexa PRO
Product description
Motor winding: Temperature limiter
(1-circuit temperature monitoring)
Motor winding: Temperature controller
(2-circuit temperature monitoring)
External monitoring devices
Sealing chamber
Key: - = not available/possible, o = optional, • = as standard
All the monitoring devices fitted must always be connected!
Monitoring of motor compartment
The motor compartment monitoring protects the motor winding from short-circuits.
The moisture is measured by an electrode.
Monitoring of motor winding
The thermal motor monitoring protects the motor winding from overheating. Bimetallic
strips are installed as standard for the temperature measurement. As an option, the
temperature can also be measured with PTC sensors. The design of the thermal motor
monitoring depends on the motor:
▪ P 13 motor:
The thermal motor monitoring is designed as temperature limiter. When the temper-
ature is reached, deactivation with reactivation lock must take place.
▪ P 17 motor:
The thermal motor monitoring is designed as temperature controller. This allows the
measurement of two temperatures. When the low temperature is reached, an auto-
matic reactivation can be initiated after cooling the motor. When the high temperature
is reached, the unit must deactivate with reactivation lock.
External monitoring of the sealing chamber
The sealing chamber can be equipped with an external pencil electrode. The electrode
registers fluid ingress through the mechanical seal on the fluid side. An alarm or deac-
tivation of the pump can therefore take place by pump control.
Operating mode S1: Continuous duty
The pump can operate continuously at the rated load without exceeding the permiss-
ible temperature.
Operating mode S2: Short-time duty
The maximum operating period is specified in minutes, e.g. S2-15. The pause must last
until the machine temperature no longer differs from the temperature of the coolant by
more than 2 K.
Operating mode S3: Intermittent periodic duty
This operating mode defines a switching cycle in a combination of periods of operation
and standstill. Specified value (e.g. S3 25 %) relates to the operating time. The switch-
ing cycle has a duration of 10 min.
If two values (e.g. S3 25 %/120 s) are specified, the first value relates to the operating
time. The second value specifies the max. period of the switching cycle.
Operating mode: Non-immersed operation
The "non-immersed operation" operating mode describes the possibility of the motor
emerging during the drainage pumping sequence. This allows a further lowering of the
water level as far as the upper edge of the hydraulics. Observe the following points dur-
ing non-immersed operation:
▪ Operating mode
– P 13 motor:
The motor can be run non-immersed in "non-immersed" operating mode.
– P 17 motor:
The motor can be run non-immersed for short periods. CAUTION! To protect the
motor winding from overheating, the motor must be equipped with a temperature
P 13 P 17
• o
o •
o o
en
147