Switch-Disconnectors - Eaton PowerXL DB1 Installation Manual

2 Engineering

2.7 Switch-disconnectors

2.7 Switch-disconnectors
34
Switch-disconnectors are used as repair and maintenance switches in indus-
trial, trade, and building service management applications. At the output of
variable frequency drives, they are primarily used to locally switch off motors
(pumps, fans) that pose a risk of unintended starting during maintenance or
repairs. In order to provide greater occupational safety, these switch-discon-
nectors can be locked out with the use of padlocks, meaning they have char-
acteristics comparable to those of main switches as defined in EN 60204.
Eaton T0.../MSB/..., P1.../MSB/..., and P3.../MSB/... enclosed switch-dis-
connectors are designed for local installation with an IP65 degree of protec-
tion. The internal screening plate ensures that screened motor cables can be
easily connected in a way that meets EMC requirements.
For more information and technical data on T0.../MSB/
a
..., P1.../MSB/... and P3.../MSB/... switch-disconnec-
tors, please refer to Instruction Leaflets IL008020ZU and
IL008037ZU.
The switch-disconnectors on the output side of DB1 variable frequency
drives need to be sized based on utilization category AC-23A
(IEC/EN 60947-3) for the assigned rated motor current and the corresponding
rated operating voltage.
When a motor is being switched off, the DB1 variable frequency drive's
output (inverter) must be disabled (the FWD/REV enable signal must be
switched off) before the contacts are opened.
ATTENTION
Switching off during operation in vector mode (P-60 = 0 / 2 / 3 / 4)
is not permissible and may result in damage to the switch-dis-
connector and the variable frequency drive.
DB1 Variable Frequency Drives 09/17 MN040031EN www.eaton.com