Maintenance And Repair - Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento

en-US
13.3.4.5 Sealing chamber monitoring (ex-
ternal electrode)
13.3.4.6 Operation on frequency converter ▪ Type of converter: Pulse-width modulation
13.3.5 Commissioning
13.3.6

Maintenance and repair

52
Appendix
▪ 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!
▪ Continuous duty: 30 Hz up to rated frequency (50 Hz or 60 Hz). Comply with the minimum
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 converter,
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 hy-
draulics. 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 tolerance 0
must be provided for category 2.
▪ Carry out maintenance tasks according to the regulations.
WILO SE 2019-01