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ST - III Series POWER SUPPLIES
Introduction
These instructions detail the installation and operation requirements for the ST20-III & ST35-III
power supplies. These have been designed for operation in RV's providing a DC power system,
with optional battery back up.
The units operate from 240Vac and provide an isolated 13.65Vdc output at 20A and 35A
respectively for powering the load and charging of batteries. All the necessary protection and
operating features for the load and batteries are provided. An optional DC input is also provided to
enable charging of batteries and powering of the load from an external +13.8V DC power source.
The units are fully enclosed ready for direct wall mounting. All connections are at the rear of unit
providing convenient wiring and installation. User access to all load and battery fusing has been
provided from the front of the unit.
Operation
Safety: Refer to the installation section before operating. Correct installation is the most critical
factor in ensuring the safe use of the power supply. If every consideration of these instructions has
been satisfied the power supply will be safe to operate.
If the AC supply cord is damaged it must be replaced by the manufacturer, its service agent or
similarly qualified persons in order to avoid hazard.
The unit is rated to charge a single 12V (up to 6 cells) lead acid battery at 100Ahr Capacity.
Functional Diagram:
DC External
Input
AC Input
USER MANUAL
AC / DC
Power Supply
Vadj
Battery Low Voltage
Disconnect circuit
Manual
Battery
Isolation
On / off
Input
Figure 1 Functional Block Diagram
Page 1 of 11
Fuse Panel
Isense
0.8A
Trickle
+ve
8 x Load
Outputs
-ve
+ve
Battery
Output
-ve
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Table of Contents
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Summary of Contents for Setec ST - III Series
- Page 1 ST - III Series POWER SUPPLIES USER MANUAL Introduction These instructions detail the installation and operation requirements for the ST20-III & ST35-III power supplies. These have been designed for operation in RV’s providing a DC power system, with optional battery back up.
- Page 2 ST–III Series Power Supplies USER INSTRUCTIONS AC/DC Power Supply: This provides an isolated 13.65Vdc output for powering of the load and float charging of the battery. Battery current is sensed and monitored by the power supply to ensure that the maximum charging current is not exceeded. Battery Features: The power supply provides full battery management as per the following.
- Page 3 ST–III Series Power Supplies USER INSTRUCTIONS 3. Flashing 1s ON, 1s OFF, with no battery connected the power supply may be in hiccup mode which will cause the indication to flash with random duty cycle and frequency. 4. Fault Led= Solid On, All other leds = OFF, irrespective of actual mains or LVD status. Auxiliary Power Input: The power supply terminal “Aux In +VE”...
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Page 4: Installation
ST–III Series Power Supplies USER INSTRUCTIONS Installation Host Equipment: The host equipment must ensure that access to the unit (other than the front panel) by the user is prevented. Personnel: Installation is to be carried out only by suitably qualified personnel. Ventilation: Provide a minimum of 80mm clearance above, below and behind the unit. - Page 5 ST–III Series Power Supplies USER INSTRUCTIONS Wiring Up Mains: This is pre cabled and fitted with AS/NZ mains plug ready for connection to internal GPO. Ensure that the connection to the mains supply is in accordance with the national wiring rules, and that the earth connection is installed.
- Page 6 ST–III Series Power Supplies USER INSTRUCTIONS Cabling sizes: DC cables must be sized to carry the maximum full load current and not exceed the system volt drop requirements. The following cable sizes are recommended. Current 0 -10 A 10 - 20 A 20 - 30 A Where cables pass through any part of a metal panel or cover, ensure that a cable gland or bush is fitted to the hole.
- Page 7 ST–III Series Power Supplies USER INSTRUCTIONS CAUTION: Ensure that there is good ventilation from the battery area. Ensure that cable connections to batteries have the correct polarity and are protected against accidental short circuit. Ensure that the shrouding supplied with the battery is fitted to the terminals Provide visual notification that batteries are being used in area of use.
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Page 8: Specification
ST–III Series Power Supplies USER INSTRUCTIONS Specification Input Voltage: ST20-II & ST35-II: 230 – 240Vac nominal, ±10%, 50/60Hz. The power supply will withstand a 5 minute, +15% surge on the maximum nominal voltage Input Surge: < 40A (cold start) Hold-up Time: >... -
Page 9: Battery Management
ST–III Series Power Supplies USER INSTRUCTIONS Battery Management To maintain the battery in a good state of health an intelligently controlled charging algorithm is used. The purpose is to ensure that the correct voltages are applied to the battery terminals at the appropriate times throughout it’s usage cycle. -
Page 10: Battery Charging Voltage Over Time
ST–III Series Power Supplies USER INSTRUCTIONS Present Output Conditions Required to New Output Set Operational State Set Voltage Enter Operational State Voltage Vfloat (No Mains Mains input voltage was Loss of mains, boost Vboost Input) detected after being absent charging mode, active after for more than 1 hour. -
Page 11: Electromagnetic Compatibility (Emc)
ST–III Series Power Supplies USER INSTRUCTIONS Electromagnetic compatibility (EMC) Electromagnetic compatibility (EMC) is defined as “the ability of a device, equipment or system to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbance to anything in that environment”. Switch-mode power supplies are good generators of EMI and as such care needs to taken during their designs to limit their emissions.
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