It follows safety concerns highlighted by two violent assaults against staff last week, which saw three people taken to hospital.

Discussions started on Friday, as centre staff participated in a health and safety cease work.

The centre was in partial lockdown at the weekend.

Community Public and Service Union spokesperson Julian Kennelly said some of the centre's clients had restricted movement, while others were fully locked down.

He said the union's aim in today's talks was to reach an understanding that the centre would not be expected to operate as though fully staffed if there wasn't a full staff complement on the roster.

"We made progress on Friday," Mr Kennelly said.

But an agreement was not reached.

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