Operating Principle - hager MZ901 Manual Del Usaurio

Function
These products are remote control auxiliaries for modular protection devices (RCD).
They allow:
- to operate by remote control the closing and opening contacts of the associated device (RCD),
- to indicate the state of contacts and the tripping of the associated product.
The product MZ911 has a further function which allows a second automatic tripping when fault
current.

Operating principle

Position
of front
selector
d
• Remote controls "on", "off", "reset" and " " are all
operational (input n°2 - n°8).
• Contact openings for default current are counted:
- tripping < 3: control setting "on" is operational after
3 mins or 30 secs time delay (see side selector "time
set" 7 ).
"off & on"
- tripping = 3: control setting "on" is jammed.
• Remote controls "on", "off", "reset" and " " are all
operational (input n°2 - n°8) as well as automatic
reclosing.
• Transient fault: if no other tripping occurs within 2 secs
after closing, this fault is not taken into account and the
number of tripping is reset to 0. Automatic reclosings or
remote control settings (to) "on" are jammed for 3 mins
or 30 secs after each tripping (see side selector "time
set" 7 ).
• Permanent fault: if tripping occurs in 2 secs after
"auto"
closing, this second fault is taken into account.
- tripping < 3: automatic reclosings or remote control
only for
settings "on" are operational after 3 mins or 30 secs
MZ911)
time delay (see side selector "time set" 7 ).
- tripping = 3: automatic reclosing or control setting "on"
are jammed for 3 mins or 30 secs after each tripping
(see side selector "time set" ∆).
• This reinitialisation consists of resetting the time delays
and the number of trippings.
• All the controls and the automatic reclosing are locked
(MZ911).
• If the position is held over 5 secs, the product is
reinitialised.
• Then with front selector in position "off & on" or "auto",
"reset"
remote controls are operational. To activate the
automatic resetting, use the remote control setting "on"
(input n°2).
• Remote unlocking is possible with remote control setting
"reset" (input n°6).
• This position locks all the controls and also the
automatic reclosing.
" "
MZ901
¢ §
Remote control auxiliary
MZ911
£
Auto reclosing remote control
auxiliary
User instructions
Functioning
Indicator light
c
• Green: no tripping
• Amber: 1 tripping
• Red: no more tripping
allowed
• Intermittent red:
already 3 trippings
(jammed product)
• Green: no tripping.
• Intermittent red:
already 3 trippings
(jammed product)
• Intermittent green
• Green
• Intermittent light