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External power supply unit
SAP 20
Installation instructions
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/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 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.
1
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Summary of Contents for Siemens SAP 20
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Page 1: Installation Instructions
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... - Page 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).
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Page 3: Powering Up The System
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... -
Page 4: Technical Data
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.