Internal Interlocking Of Panel With Switch-Disconnector; Circuit Breaker And Contactor Plug Connector Coding - ABB UniGear ZS1 Instruction Manual

Figure 21: Switch-disconnector compartment – open
position. Insulating plate in the isolating
distance of switch-disconnector 200 Switch-
disconnector
200.1 Position indicator of switch-
disconnector
205 Insulation partition wall
205.1 Movable insulation plate

3.5 Circuit breaker and contactor plug connector coding

3.4.5 Internal interlocking of panel with switch-disconnector

To prevent hazardous situations and erroneous operation, there is a series of interlocks to protect both
personnel and equipment:
• The switch-disconnector can only be switched on if the earthing switch is off. The earthing switch
can only be switched on if the switch-disconnector is off. The switch-disconnector and earthing
switch are mutually mechanically interlocked;
• The door of the lower cable HV part on the panel can only be opened if the earthing switch is on.
During closing of the earthing switch the insulating plate 205.1 (figure 21) is automatically inserted
in the isolating distance of the switch-disconnector, which increases safety. This plate is automati-
cally removed again during opening of the earthing switch;
• The earthing switch can only be operated if the cable compartment door is closed;
• If the control voltage is not connected, the switch-disconnector can only be opened and closed
manually. Manual operation of switch-disconnector and earthing switch can be prevented if the
slides 201.2 and 208.1 of the operating openings are locked up;
• In the panels with digital control techniques the protection against erroneous operation is basically
carried out by means of panel software. But the earthing switch is operated locally by means of
operating lever 215 (figure 22). The mechanical interlock between the switch-disconnector and
earthing switch is still in operation;
• Details of other possible interlocks, e.g. in connection with a locking magnet on the switch-
disconnector, can be obtained from the relevant order documents.
Warning
• The door of the upper HV part on the panel can only be opened if the off-circuit condition of
the switch disconnector is verified. This means that the off-circuit condition must be
unconditionally verified both on the upper and lower contacts of switch disconnector.
The control wiring plug connector coding allows withdrawable parts for switching devices to be
assigned to particular panels. This ensures, for example, that withdrawable parts with different rated
currents or different control wiring circuits can only be used in the panels they are intended for.
Coding pins are fitted in the control wiring sockets 10.1 (figure 23) or control wiring plugs 10.2 (Figure
5), and engage with the corresponding bores of the relevant plug 10.2 or socket 10.1 when the two parts
are connected.
The plug connector coding is order-related, and is noted in the relevant wiring documentation.
200.1
200
215
205.1
205
Figure 22: Preparation for the operation of earthing
switch in panel with the switch-disconnector.
Operating lever prepared for the operation
OFF.
215 Operating lever
17