Siemens SAP 20 Installation Instructions Manual

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External power supply unit

SAP 20

SLP 20 UK

20 800 225.0-010

Installation instructions

1. Product description

The SAP 20 is a power supply unit suitable for an E-Bus and
has an output voltage of 12 V at a maximum of 2.3 A. The
housing offers space for 7 type SMT 11 (transponder) or SMR
11 (isolator/amplifi er) circuit boards and for a 12 V, 24 Ah
battery. At least one SMT 11 must be fi tted to use the cover
tamper contact.

2. Supply package

The SAP 20 UK package contains the following:

- One SAP 20 power supply unit.

- One set (4 off) of spacers.

- One SLP 20 UK language kit complete with :

- Installation instructions.

- One wiring diagram.

3. Mounting instructions

The SAP 20 external power supply unit is designed for moun­ting in dry indoor rooms. It must not be exposed to dripping
or splashing water.

3.1 Open cover (Fig. 1)

1 - Slacken cover screw W.
2 - Remove cover.

3.2 Product overview (Fig. 1)

- Housing E.

- Power supply assembly circuit board SMP 20 I.

- Transformer SMU 31 U.

- Mains supply terminals T with fuse.

- Eye O for sealing.

- Tamper contact P.

- Cable inlet Y.

- Mounting holes for SMT 11 or SMR 11 circuit boards
(optional) Q.

- Space for battery R.

- Cover screws W.

Fig. 1

8AA10427 - F0 - 09/04/2003 - UK - SNR 557773.0-001

1

Fuses
No. Terminal Function Type

F1 B4+ E-Bus F2AL
F2 +1 +12V F2AL
F3 +3 +12V F2AL
F4 +4 +12V F2AL
F5 +6 +12V F2AL
F6 + Batt. Battery T2AL

Fig. 2

3.2.1 Power supply unit circuit board SMP 20 (Fig. 2)

- Transformer terminal Y 20V, 50Hz.

- Relay R which can be programmed from the central
control unit.

- Four +12 V voltage outputs W (+1, +3, +4, +6) each of
which is protected by a fuse (F2 to F5).

- Output E for mains supply indication (not fused).

- E-Bus connection to central control unit Q (B1-, B2, B3,
B4+). B4+ is protected by fuse F1.

- Pre-wired battery terminal T is protected by fuse F6.

- Address key P.

- LED { fl ashes if the E-Bus communication is correct.

- LED I for mains supply indication.

- The adjustment of potentiometer U ,O must not be disturbed.

A

W

Fig. 3

4,5 x 45

Ø 6 mm

Q

Q

3.3 Fit housing (Fig. 3)

S6

1,5 cm

B

1 - Mark the drilling position for the four mounting holes Q.
2 - Drill the holes and insert plugs.
3 - Screw in the screws leaving approximately 1.5 cm
proud (Fig. 3B).
4 - From the back, snap the spacers into the slots provided
at the four mounting holes (Fig. 3A).
5 - Pass the connecting cable through the opening W provi
ded and hang the housing base on the screws
6 - Tighten the mounting screws.

3.4 Fit circuit boards SMT 11 or SMR 11 "optional"
(Fig.4)

1 - Engage the mounting studs (provided with the circuit
boards) in the holes provided (Fig. 4A).
2 - Fit circuit boards (Fig. 4B).

Fig. 4

A

B

2