Siemens SAP 20 User manual

Fig. 1

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/ampliﬁer) circuit boards and for a 12 V, 24 Ah

battery. At least one SMT 11 must be ﬁtted 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 moun-

ting 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.

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

Installation instructions

External power supply unit

SAP 20

SLP 20 UK

20 800 225.0-010

Fig. 2

Fig. 3

Fig. 4 B

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 { ﬂashes if the E-Bus communication is correct.

- LED I for mains supply indication.

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

3.3 Fit housing (Fig. 3)

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 Wprovi

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).

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

1,5 cm

Ø 6 mm

4,5 x 45

Fig. 5

Fig. 6

Fig. 7

Fig. 8

4. Wiring

The terminals can be seen in Fig. 2 or in the wiring diagram

glued to the inside of the housing cover.

4.1 Mains supply (Fig. 5)

The external mains supply should preferably be connected

through a separate unswitched fused spur.

Cable type 3 x 1.5 mm2is recommended.

1 - Ensure that the mains supply terminal is de-energised.

2 - Remove mains supply fuse F7 Q.

3 - Check the protective conductor connection to the base

of the housing.

4 - Connect the mains to the mains supply terminals

(neutral N, live L and earth).

5 - Secure the cable to the clips in the rear wall using

cable ties.

4.2 E-Bus (Fig. 6)

Cable type 24 AWG 7 x 0.2 mm is recommended. The total

length of the E-Bus cable must not exceed 500 m.

The power supply unit circuit board SMP 20 and the options

(SMT 11, SMR 11) must be connected to the central control unit

via the E-Bus (B1-, B2, B3, B4+). It may be routed in parallel

to other accessories. If shielded cable is used, the shield may

not be laid on the housing of the SAP 20. The shields of all

cables must be connected at one point, e.g. at one of the NC

terminals of SMT 11 or SAR 11.

4.3 Tamper contact (Fig. 7)

The tamper contact of the housing must be connected to the

SMT 11 circuit board. Refer also to the installation instruc-

tions for the SMT 11.

4.4 Back tamper contact

For the back tamper use the option SMZ 91.

5. Powering up the system

5.1 Switch on the 240V mains supply

1 - Ensure that everything is correctly connected and wired

and then switch on the mains supply.

2 - Reﬁt fuse F7.

5.2 Connect battery (Fig. 8)

1 - Place the battery in the space provided in the base of the

housing.

2 - Connect the pre-installed battery cables (- blue, + red).

E-Bus from

the central control unit

E-Bus to other

accessories

B4+

B1-

Fig. 9

6. Close and seal the housing (Fig. 9)

1 - Glue the circuit diagram to the inside of the cover Q.

2 - Engage the cover in the retainer.

3 - Connect the earthing lead W to the cover.

4 - Lightly lift and close the cover.

5 - Tighten cover retaining screws.

6 - Use eye E to seal.

When the cover is opened again, e.g. for servicing, there is no

need to remove it completely. After slackening the screws, the

cover can be lifted gently, swung downwards and suspended

in the base.

7.Technical data

Mains voltage 240V, 50Hz

Power consumption (230V) 230mA

Mains supply fuse 500 mA slow-blowing

Output power 12VDC, 2.3 A

Max. ripple at 2.3 A 60mVpp

Relay, single-pole changeover 48V, 5A

Battery min V-2 (optional) 12V, 24Ah

Operating temperature -10°C to +40°C

Steel housing 1.5 mm

Dimensions in mm H 500 x W 365 x D 133

Safety class IP 30

Environmental class II

Weight without battery 8.4 kg

The right to make technical changes to the described equipment

without prior notice is reserved.

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