Operating Modes; Double Pump Mode - salmson LRE Instructions De Montage Et De Mise En Service

ENGLISH
Recommended minimum distance between measuring points
and pump:
5 x pipe inner diameter
x
When using external sensors, the LRE can process the following
signals:
0-10 V (factory setting)
x
2-10 V
x
0-20mA
x
4-20mA
x
The relevant information can be found on the rating plate of
the sensor.
Further equipment
Thermal overload protection
of the frequency converter
x
of the motor via PTC
x
An electronic overload monitoring device switches off the
motor in the presence of an overload.
For data storage the modules are equipped with a non-volatile
memory. This means that data is retained even during prolon-
ged down times. Once the voltage returns the pump starts
operating again with the values set before the power outage.
Pump kick: a pump that has been switched off for 24 hours (e.g.
via ext. off) is automatically operated for 5 seconds.
The module rating plate is to be found in the module terminal
box (FIG.1; pos. 5). It contains all data necessary for scheduling
the unit.
+24 V (3) (output): Direct voltage for an ext. load/transmitter.
x
The + 24 V can be loaded with max. 60 mA. The voltage is
short-circuit-proof.
IN1 – 0 ... 10 V (1) (can be set to 2-10V; 0-20mA; 4-20mA);
x
actual value input, e.g. actual pressure value
Signal type
Voltage (0-10 V, 2-10 V)
Current (0-20 mA, 4-20 mA)
GND (2): connection to ground for signal input IN1
x
IN2 – 0 ... 10 V (can be set to 2-10V; 0-20mA; 4-20mA); set value
x
input
With control systems !p-c and !p-v and speed adjustment
(regulator mode) the IN2 can be used as input for the remote
set value adjustment. The set value follows the voltage / current
as shown in FIG. 6.
Signal type
Voltage (0-10 V, 2-10 V)
Current (0-20 mA, 4-20 mA)
GND (2): connection to ground for signal input IN2
x
aux.: unoccupied
x
Ext. off:
x
The pump can be switched on/off via the external potential-
free contact. Units which are switched on and off frequently
(> 20 times a day) should be switched on and off via "Ext. off".
SBM (collective run signal):
x
A collective run signal can be attached via the potential-free
contact for a central control point.
SSM (collective fault signal):
x
A collective fault signal can be attached via the potential-
free contact for a central control point.
MP (Multi Pump): Interface for double pump communication
x

7.3 Operating modes

The LRE / JRE series can be operated in the 'Heating' and
'Refrigeration/Air-Conditioning' modes. The difference bet-
ween both operating systems resides in the fault tolerance for
the handling of error messages.
'Heating' mode:
Input resistance
R i > _ 10 kÖ
R B = 500 Ö
Input resistance
R i > _ 10 kÖ
R B = 500 Ö
Errors are handled with tolerance (as will usually be the case),
i.e. depending on the error type involved, the pump will only
signal a fault when the same error occurs several times within
a specified time. Error matrix: 'HV'
'Refrigeration/Air-Conditioning' mode:
For all applications where each error (in the pump or unit)
needs to be detected rapidly (e.g. air-conditioning applicati-
ons).
Each error is signalled forthwith (< 2 sec). In double pump
mode, the reserve pump reaches the old operating point wit-
hin 3 seconds after occurrence of the error. Error matrix: 'AC'
Both operating modes distinguish between faults and war-
nings. In the case of a fault, the motor is switched off, the error
code shown on the display and the fault indicated by the red
LED.
Faults always result in activation of the SSM (see sections 7.4
and 8.2).

7.4 Double pump mode

The following characteristics are only available if the internal
MP interface is used.
Both pumps are controlled by the master.
Pump fault: The other pump operates according to the stan-
dard control of the master. The master pump is the left-hand
pump in the direction of flow (see FIG. 1a). The pressure sensor
must be connected to this pump!
IF(InterFace) module:
For communication between the pumps and the pump con-
trol processor (via LON-BUS, PLR or interface converter), each
pump requires an IF module (accessory) which is plugged into
a multiplug in the terminal box (FIG. 1).
For double pumps only the master needs to be equipped with
a PLR or LON module!
Master – slave communication via an internal interface (termi-
nal: MP , see FIG. 2).
When using a pump control processor (PLR) / interface converter or
the LON interface:
As a rule, the master pump is connected to the PLR or LON
Communication
PLR/interface converter
LONWORKS network
Peak load mode: At partial load, the hydraulic capacity is pro-
x
vided by one pump only. The second pump is connected at
maximum efficiency, i.e. when the sum of the power con-
sumptions P1 of both pumps in the partial load range is less
than the power consumption P1 of one pump. Both pumps
are then adjusted upwards simultaneously to max. speed.
Main / reserve mode: Each of the two pumps produces the
x
design delivery rate. The other pump can be used in the
event of the first pump malfunctioning or following a pump
swap. Only one pump operates at a time.
Operation in the event of a communication breakdown:
x
In the event of a communication breakdown both displays
show the error code 'E52'. During the breakdown both pumps
behave as single pumps.
Both modules indicate the fault via the ESM/SSM contact.
Control is taken over by the master irrespective of the previous-
ly set mode.
The behaviour of the slave pump varies as a function of the mode
Main/reserve mode: Slave is always switched off
Addition mode (master or slave operating): Slave is always swit-
ched off
Addition mode (master and slave operating): Slave operates at
maximum speed
After acknowledging the error display the status is indicated on
both pump displays during the communication breakdown. At
the same time, the ESM/SSM contact is reset.
36
Master Slave
IF module PLR not required
IF module LON not required