Crestron Lighting Design Przewodnik Instalacji Pobierz pdf (Strona 31)

230 V Lighting Design Guide

Doc. 4859C | crestron.com

The PAC2 provides external connections for both a back-up processor and emergency override closure signals. In

the absence of Cresnet or in case of a power failure, a signal is generated to switch power and communication of

the Cresnet system to a back-up processor. When the override connection receives a contact closure, a signal is

passed to the lighting modules via the ﬁfth wire of the interconnect cable, and the lights are turned on at a

pre-programmed emergency level. They remain at this level until that contact closure is opened.

The backup net input connector allows a backup control system to automatically take control of the Cresnet

network in the unlikely event of an internal processor failure. The built-in Cresnet watchdog switches over when the

CPU fails.

The fault connector provides a dry contact closure fault signal to notify an external control system when the PAC2

has a system fault. This output may be connected to a digital input of the backup computer. A fault is deﬁned as the

CPU not interacting with Cresnet for 10 seconds. The watchdog switches back if the backup computer Cresnet is

inactive for 10 seconds. The PAC2 offers eight programmable analog and digital inputs as well as digital outputs.

There are eight normally open relays, isolated with MOV suppression.

PAC2 Connections

PAC2 Connection Example

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Crestron Lighting Design Przewodnik Instalacji Strona 31