Wilo T 12 Notice De Montage Et De Mise En Service page 121

13.3.4.5 Leakage chamber monitoring
13.3.4.6 Monitoring of motor bearing
13.3.4.7 Sealing chamber monitoring (ex-
ternal electrode)
13.3.4.8 Frequency converter operation
13.3.5 Commissioning
13.3.6 Maintenance and repair
Installation and operating instructions Wilo Motor T 12 ... 72 + EMU FA, Rexa SUPRA, Rexa SOLID
Appendix
▪ Connect the PTC sensor via an evaluation relay. Relay "CM-MSS" is recommended for
this. The threshold is preset.
Connect the float switch using an evaluation relay! Relay "CM-MSS" is recommended
for this. The threshold is already pre-set.
The connection is made as described in the "Electrical connection" section.
▪ Connect the external pencil electrode via an Ex-rated evaluation relay! Relay "XR-4..." is
recommended for this.
The threshold is 30 kOhm.
▪ The connection must be made using an intrinsically safe circuit!
▪ Type of converter: Pulse-width modulation
▪ Continuous duty: 30 Hz up to rated frequency (50 Hz or 60 Hz). Comply with the min-
imum flow velocity!
▪ Min. switching frequency: 4 kHz
▪ Max. overvoltages on the terminal board: 1350 V
▪ Output current on the frequency converter: max. 1.5 times rated current
▪ Max. overload time: 60 s
▪ Torque applications: quadratic pump curve
Speed/torque curves required are available on request!
▪ Observe additional measures with regard to EMC regulations (choice of frequency con-
verter, filters, etc.).
▪ Never exceed the rated current or rated speed of the motor.
▪ It must be possible to connect the motor's own temperature monitoring (bimetallic
strip or PTC sensor).
▪ If the temperature class is marked as T4/T3, temperature class T3 applies.
DANGER
Risk of explosion when using non Ex-rated pumps!
Pumps without Ex rating may not be used in potentially explosive areas! There is a
risk of fatal injury due to explosion! Only use pumps which have the appropriate Ex
labelling on the rating plate within potentially explosive areas.
DANGER
Risk of explosion due to flying sparks in the hydraulics!
During operation the hydraulics must be flooded (completely filled with the fluid). If
the volume flow is interrupted or the hydraulics emerges, air cushions can form in
the hydraulics. If this happens, there is a risk of explosion, e.g. flying sparks due to
static charge! Dry-running protection must ensure that the pump is deactivated at
the appropriate level.
DANGER
There is a risk of explosion if dry-running protection is connected incor-
rectly!
If the pump is operated within an explosive atmosphere, the dry-running protection
must have a separate signal transmitter (redundant protection of the level control).
Pump deactivation must be performed with a manual reactivation lock!
▪ The operator is responsible for defining the potentially explosive area.
▪ Only pumps with corresponding Ex rating may be used within a potentially explosive
area.
▪ Pumps with Ex rating must be labelled on the rating plate.
▪ Do not exceed the maximum fluid temperature!
▪ Dry running of the pump must be prevented! Ensure on-site (dry-running protection)
that emerging of the hydraulics is prevented.
According to DIN EN 50495, a safety device with SIL level 1 and hardware fault toler-
ance 0 must be provided for category 2.
▪ Carry out maintenance tasks according to the regulations.
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