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ST - II Series POWER SUPPLIES
Introduction
These instructions detail the installation and operation requirements for the ST20-II & ST35-II
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.
Functional Diagram:
DC External
Input
AC Input
USER INSTRUCTIONS
AC / DC
Power Supply
Vadj
Battery Low Voltage
Disconnect circuit
Figure 1 Functional Block Diagram
Isense
0.8A
Trickle
Page 1 of 11
Fuse Panel
+ve
5 x Load
Outputs
-ve
+ve
Battery
Output
-ve
Doc 019244
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Table of Contents
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Summary of Contents for Setec ST20-II
- Page 1 ST - II Series POWER SUPPLIES USER INSTRUCTIONS Introduction These instructions detail the installation and operation requirements for the ST20-II & ST35-II power supplies. These have been designed for operation in RV’s providing a DC power system, with optional battery back up.
- Page 2 The power supply is a four stage battery charger with Boost (VBoost = 14.05V), Float (VFloat = 13.65V), Store (VStore = 13.25V) and Trickle charge modes to ensure long battery life. Charging current is limited to a maximum of 10A (ST20-II) and 15A (ST35-II). This provides optimum life for the batteries.
- Page 3 ST – II Series POWER SUPPLIES USER INSTRUCTIONS Power supply unit should only be powered from either 240VAC mains or Auxiliary Power (Auxiliary Power also includes solar power) but not both. Failure to do so may result in damage to power supply.
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Page 4: Installation
ST – II 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 – II 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 – II Series POWER SUPPLIES USER INSTRUCTIONS Battery Connection Procedures: Battery should be connected as per the following steps. Turn power supply off and all 12 volt equipment connected to power supply. Connect positive battery terminal to “Batt +VE” power supply terminal. Connect negative battery terminal to “Batt -VE”...
- Page 7 This product is suitable for charging 12V-Sealed Lead-Acid (SLA) batteries including Valve- Regulated Lead-Acid (VRLA) batteries both Absorbed Glass Mat (AGM) and Gel batteries. Charging current is limited to 10A (ST20-II) and 15A(ST35-II). CAUTION: Ensure that there is good ventilation from the battery area.
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Page 8: Specification
ST – II 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 – II 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 – II 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)
(<3m) and as such do not guarantee that the power supply will not cause interference with devices such as TV’s or radios. The ST20-II/35-II have been designed with equipment interoperability in mind. The emissions are in the order of 10 – 100 times below the regulator requirements (this is expressed in dB (µV)) and greatly reduce the likelihood of causing interference with Radios and TV’s located in close...
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