General i nform a ti on
User instructions. DGM speed regulator
20
1.9.6
Maintenance and inspection
Maintenance and inspection of the speed regulator may only be carried out by suitably trained
electricians. Unless otherwise indicated specifically in these user instructions, the changes to
the hardware and the software may only be performed by BONFIGLIOLI experts or by persons
authorized by BONFIGLIOLI.
Cl eani ng the spe ed regul a t or
The speed regulator does not require maintenance when used correctly. If the air is dusty, the
cooling fins of the motor and the speed regulator must be cleaned regularly. In the case of
devices with integrated fans (standard for size D), it is recommended to use compressed air for
cleaning.
M easurem ent of the con tro l board i nsul ati on resi st an ce
It is not permitted to check the insulation on the input terminals of the control
board
.
Measurement of the power module insulation resistance.
During on-line testing, the DGM power module is tested with 2.02 kV.
If during the system check it becomes necessary to measure the insulation resistance, do so
under the following conditions:
The insulation can only be checked for the power module.
To avoid excessively high voltages, disconnect all the DGM connection cables before
performing the check.
A 500 Vdc device for checking the insulation must be used.
Fig. 5: Power module insulation check
Sample
Groun
d
Isolation control app.
500Vdc
