Wilo Rexa PRO Series, Инструкция по установке и эксплуатации

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Installation and operating instructions Wilo-Rexa PRO 23
INSTALLATION US English
7 10, 20
Temperature monitoring: Center
terminal
8 11, 21
Temperature monitoring: High
temperature
9 12, 22
Temperature monitoring: Low
temperature
Green/yellow PE Ground
The wire assignment for freely configured pumps
in the PRO series can be found in the connection
diagram enclosed with this manual.
5.5.5. Connecting the monitoring devices
RISK of fatal injury due to explosion!
If the monitoring devices are not connected
correctly, there is a risk of fatal injury due to
explosion if used in potentially explosive areas!
Always have the connection carried out by an
electrician. If the pump is used in potentially
explosive areas:
• The temperature monitor must be connected via
an evaluation relay. We recommend the “CM-
MSS” relay for this. The threshold comes preset.
• Deactivation by the temperature limiter must be
conducted with an anti-reactivation mechanism,
meaning that reactivation should only be pos-
sible if the “release button” has been pressed
manually!
• The pencil electrode for sealing chamber control
must be connected via an intrinsically safe cir-
cuit with an evaluation relay. We recommend the
“XR-42x” relay for this. The threshold is 30 kΩ.
• Also note the additional information in the ap-
pendix!
All monitoring devices must be connected at all
times.
Motor temperature monitor
The pump is equipped as standard with a tempera-
ture monitor with a bimetallic strip.
• P 13 motor:
The motor is equipped as standard with a tem-
perature limit (single-circuit temperature moni-
toring). When the threshold is reached, the motor
must switch off.
If a temperature controller and limiter are fitted
(two-circuit temperature monitoring; can be
ordered as an option), a “preliminary warning” can
take place at the low value and “deactivation”
must take place at the higher value.
• P 17 motor:
The motor is equipped as standard with a tem-
perature control and limit function (2-circuit
temperature monitoring). When the low threshold
is reached, a "preliminary warning" may be issued,
when the high threshold is reached, the motor
must switch off.
• When used outside potentially explosive areas , the
bimetallic strips can be connected directly in the
switchgear.
Connection values: max. 250 V(AC), 2.5 A, cos φ = 1
• PTC sensors (optionally available) must be connect-
ed via an evaluation relay. We recommend the “CM-
MSS” relay for this. The threshold comes preset.
For this reason, no warranty claims can be accepted
for any damage to the winding resulting from un-
suitable motor monitoring.
Motor compartment monitoring (P 13 motor only)
• The motor compartment monitor must be con-
nected via an evaluation relay. We recommend the
“NIV 101/A” relay for this. The threshold is 30 kΩ.
When the threshold is reached, the unit must switch
off.
Connecting the pencil electrode (available as an
option) for sealing chamber control
• When used outside potentially explosive areas ,
the pencil electrode can be connected via the
NIV 101/A relay. The threshold is 30 kΩ. When the
threshold is reached, a warning must be given or the
unit switched off.
CAUTION!
If there is only a warning, the pump could be ir-
reparably damaged by water ingress. We recom-
mend always switching the pump off!
5.6. Motor protection and activation types
5.6.1. Motor protection
The minimum requirement for motors with a free
cable end is a thermal relay/motor protection switch
with temperature compensation, differential trig-
gering, and an anti-reactivation device, in accor-
dance with national regulations.
If the pump is connected to electrical systems
in which faults frequently occur, we recommend
installing additional protective devices, to be pro-
vided by the customer (e.g. relays for overvoltage,
undervoltage, or phase failure; lightning protection,
etc.). We also recommend installing a residual cur-
rent device (RCD).
Local and national regulations must be observed
when connecting the pump.
5.6.2. Activation types
Direct activation
At full load, the motor protection should be set
to the rated current shown on the rating plate. At
partial load, we recommend that the motor protec-
tion be set 5% above the current measured at the
duty point.