How does a duty holder know the VSD, operating in the way you say, meets the requirements of the Electricity at Work Regulations?
Do we simply trust that the manufacturer should have built this protection into the device, and it works?
Are you absolutely sure that the current limit in the drive actually provides adequate protection? I'm sure that additional devices in the Assembly are necessary - and it's really the switchgear/controlgear assembly that we are looking at the performance of here, and not the drive itself. Certainly, VSD instructions to contain recommendations of additional protection equipment, such as an input contactor dropped out by the overload signal, to achieve fast disconnection time ... but the design is left to the assembly manufacturer.
The assembly would of course comply with BS EN 61439, and should be provided with suitable instructions (according to that standard) for safe installation, operation and maintenance.
Don't forget, you mentioned that the VSD itself provided the protection ... but I believe it's the assembly as a whole.
How does a duty holder know the VSD, operating in the way you say, meets the requirements of the Electricity at Work Regulations?
Do we simply trust that the manufacturer should have built this protection into the device, and it works?
Are you absolutely sure that the current limit in the drive actually provides adequate protection? I'm sure that additional devices in the Assembly are necessary - and it's really the switchgear/controlgear assembly that we are looking at the performance of here, and not the drive itself. Certainly, VSD instructions to contain recommendations of additional protection equipment, such as an input contactor dropped out by the overload signal, to achieve fast disconnection time ... but the design is left to the assembly manufacturer.
The assembly would of course comply with BS EN 61439, and should be provided with suitable instructions (according to that standard) for safe installation, operation and maintenance.
Don't forget, you mentioned that the VSD itself provided the protection ... but I believe it's the assembly as a whole.
