ABB RHD Series - 5 Electrical Connections; General; Covers

20 RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A
5 Electrical connections
WARNING
Risk of injury due to live parts!
Risk of death or serious injuries due to electricity and
unexpected machine movements. In automatic mode the
motor is always under power, even at standstill.
• When working on the actuator or the related subassembly,
switch off the supply voltage for the electronic unit and
separate anti-condensation heater (option), and take
precautions to prevent unintentional switch-on.
General
The cable between actuator and electronic unit is connected to
the electronic unit via terminals and to the actuator via a plug.
The plug housing may contain a carrier for terminals or for the
cable ends with crimp sockets.
1
Terminal carrier
2
Cables with cable end sleeve
3
Crimp carrier
4
Cables with crimp pins
5
Plug housing
6
Carrier
7
Male carrier
Figure 34: Exemplary illustration of cable connection to the actuator; plug housing may
contain alternatively a terminal carrier or a crimp carrier.
Covers
A
Screws
B
Cover or similar component
Figure 35: Exemplary cover
Terminal covers and other components at the Contrac actuators
and electronic units are fastened with 4 or more screws (only 2
screws for local control panel cover).
In some cases, they are additionally sealed with a soft rubber
gasket. In order to avoid a gap between the housing and the
cover (or the other component) tighten these screws evenly
crosswise according to the order in the basic sketch in Figure 35
to get an even load.
Start with one screw and tighten it slightly. Then tighten the 2nd,
opposite screw in the same manner. Continue with the
remaining screws. Finally tighten the screws in the same order.
This will ensure a tight seal.