Specifications

Installation

IPN 997-00012-49F November 2012

Step 2 - Check high ac voltage protection at the site

1 Check if the ac voltage is expected to exceed 275V (L-N).

2 If so, then it is strongly recommended that an external high voltage protection

unit (HVPU) be installed. This will automatically disconnect the ac at high

voltage and reconnect it at normal voltage.

3 Install the HVPU as in the following diagram.

4 Connect the High VAC alarm output to one of the Digital Inputs on the I/O

board (see the diagram on page 10 for location).

 The High VAC alarm signal lines must be isolated from the ac supply by a

voltage-free relay contact.



AC supply



Primary transient protection devices



High voltage protection unit with alarm output



Secondary transient protection devices

(MOVs)



dc power system



I/O board



SC200 or SC100 system controller



Rectifiers

Step 3 - Check the type of ac supply, disconnect device and RCDs

1 Check the type of ac supply. Only the types of ac supply listed in Task 3 on page

26 are suitable for the APS.

 Only use a two-phase or three-phase (L-L) ac supply if referenced to earth, or a

protection system is in place so that the phase-earth voltage cannot exceed the

rating of the rectifier.

2 Check that the APS will be connected to a suitable upstream ac disconnect

device such as Miniature Circuit Breaker(s) (MCB) or fuses.

3 Check the disconnect device will isolate both the phase and neutral conductors

in single-phase and three-phase connections, unless the neutral conductor is

clearly identified.

4 Check that any Residual Current Devices (RCD) upstream of the APS are rated

for the maximum earth leakage current of the rectifiers. If necessary, install

higher rated RCD(s).

 The maximum earth leakage current of Access Power Rectifiers is given in the

Specifications on page 73.