IMO DVV

Operation
12 DVV 16.08.2021
9.2 Operating conditions
 During operation, touching the impeller must not be possible.
 Safety components must not be bypassed or put out of function.
 Prevent sucking of foreign particles, this can destroy the fan.
 Switching frequency:
- the fan is intended for S1 continuous operation!
- the control equipment must not allow any extreme switching!
 The fan may operate only within the limits declared on the nameplate. Operation above 50 Hz is allowed for the
fans accordingly designed and marked on the nameplate. The DVV/F400, F600 fan may be approved for 60 Hz oper-
ation, if synchronous speed at 60 Hz does not exceed the data from the table in section 5.1.
 If the fan is used for smoke and heat extract (F400, F600) in case of fire bridging of motor protective devices is
necessary to assure operation. Switch on max. speed even after eventual short supply cut off must be assured.
 The fans were hot tested with frequency converter and without filter. However, it is recommended to bridge even-
tual converter in case of fire (to prevent any error at motor protection setting or operation). If frequency converter
is used in case of fire, PTC and any motor protection must be bridged and switch on max. speed even after even-
tual short supply cut off assured.
 In case of speed control via frequency converter - min. 20 Hz ÷ max. 50 Hz (rsp. 60 Hz, if declared for 60 Hz), it is
recommended use of combination of frequency converter and appropriate all-pole sine filter (or dU/dt filter). It is
particularly important, if the supply cable is long, but also to reduce the motor noise. Filters may only be aban-
doned, if proven, that the voltage peaks on the connection terminals of the fan are inside stress category B-C (mod-
erate-severe) up to EN 60034-18-41. Practically, the peaks shall be lower than limits U
LL
2550 V, U
LG
1800 V and the
rise time longer than 0,5 μs. Not observing this, the motor life time could be shorter.
ATTENTION
Hazard with risk of additional costs
 At frequency controlled units additional EMC protection of cable from motor to service switch and ser-
vice switch itself could be needed (on request). Some single speed items F400 and /120 in the range 7,5
to 30 kW with EMC protection are already serially available – marking EMC.
 Subsequently fitting of EMC shielded cable from motor to connection box/service switch is connected
with disassembly of the fan!
 In the DVV fans there are not any two speed motors in Y230V/D400V connection built-in; two speed
motors are only in Y400V/Y400V or Y400V/YY400V connection.
 Small single speed motors (Y400V) are in motor connection box connected in Y ; it is impossible to
change the connection to D230V without disassembly of the fan (for eventual 3x230V frequency con-
verter).
NOTE
At single speed motors with nominal power from incl. 5,5 kW (D400V) we recommend “star – delta” start-
ing. For this purpose all 7 wires are led to connection box/service switch. Not applicable at all items with
marking EMC, which are intended for frequency converter operation.
9.3 Operation/use
Only use the fan in accordance with this operating instruction and the operating instructions of motor.
Control the fan during operation for correct function.
Switch the fan off as planned.