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Summary of Contents for Samlexpower STS-30
- Page 1 Transfer Owner's Please read this manual before Manual Switch operating your Transfer Switch 30 Amps Model: STS-30...
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Page 2: Table Of Contents
INDEX Introduction....................General Information..................Installation....................Troubleshooting..................Specifi cations.................... Warranty.................... -
Page 3: Introduction
INTRODUCTION Function of a Transfer Switch In case of failure of the main AC power source like the electric utility power, it is desirable to switch the critical AC loads to a standby / back up AC power source like a generator or an inverter. The switching action should ensure that only one AC power source is connected to the AC loads at any one time and that the electric utility power and the generator / inverter output power are never connected in parallel but remain isolated... - Page 4 Switch will be required to provide the starting capacity for the pump. Larger wattage units can be selected for simultaneous starting and operation of multiple appliances. Transfer Switch STS-30 Transfer Switch STS is designed for single phase operating voltage of 120 VAC, 60 Hz and can handle input/ output current of up to 30 A or an Apparent Power of 3600 VA (Apparent Power = Volts X Amps.
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Page 5: General Information
GENERAL INFORMATION LED1 PCB1 Fig. 2. Internal layout of contacts of the transfer relay and the PCB for relay control R1 - Transfer relay coil T1 - Line "L", Common T2 - Neutral "N", Common T3 - Line "L1", NO (Normally open contact of transfer relay) T4 - Neutral "N1", NO (Normally open contact of transfer relay) T5 - Line "L2", NC (Normally closed contact of transfer relay) T6 - Neutral "N2", NC (Normally closed contact of transfer relay) -
Page 6: Installation
INSTALLATION Features Can be confi gured for generator / power cord connection or inverter / alternate source connection Multiple ¾” and 1” knockouts (7, Fig. 1) have been provided on all the sides for ease of routing the input and output cables Consists of heavy duty 110 VDC, Double Pole Double Throw (DPDT) relay for switching both the Line and Neutral. -
Page 7: Mounting Location
INSTALLATION Mounting location The unit can be installed near the power cord entry of the RV or near the location of the generator output on the line side of the main distribution panel, or it can be installed on the load side of the panel between the main panel and a sub panel, allowing switching for either the entire electrical load or only designated circuits. - Page 8 INSTALLATION Installation Confi gurations Preset Confi guration - General This Transfer Switch has been especially pre-wired for ease of connections for setting up a backup power / UPS (Un-interruptible Power Supply) system comprising of an Inverter, a battery charger and batteries.
- Page 9 INSTALLATION a. Feed the 3 core cable from the electric utility / shore power cord / the generator through the ¾” cable clamp that has been provided (4, Fig1). Connect the three cores as follows (Fig 4): The black core to the black piece of wire connected to the NO, Line “L1” contact terminal T3.
- Page 10 INSTALLATION Testing of the operation (Fig 4) READ AND FOLLOW ALL SAFETY INSTRUCTIONS BEFORE TESTING THE OPERATION a. Plug in the power cord. As the time delay has been disabled (As explained above, if the primary source is electric utility / shore power cord, the time delay should be disabled by changing the position of the DIP Switch SW1 to ON position), the relay coil will energize as soon as the power cord is plugged in.
- Page 11 INSTALLATION a. Connect the Shore Power Cord leads to the Normally Closed (NC) contacts T-5 and T-6 of the Transfer Relay. The pre-wired 15 A cord (1, Fig1) and NEMA5-15 plug (2, Fig 1) can be used for 15 A service (If it is required to be connected to a 30 A service, this cord should be replaced with a 30 A cord).
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Page 12: Troubleshooting
TROUBLESHOOTING Low voltage Low voltage is harmful to most appliances. Relay based transfer switches are also affected by low voltage; if the voltage level drops lower than the holding voltage of the coil, the relay contacts will “chatter”. Sustained contact chattering may cause damage. General low voltage Low voltage can be caused by low voltage conditions such as in an RV park with inadequate wiring for crowded camper conditions where everyone’s electricity suffers (brownout). -
Page 13: Troubleshooting
TROUBLESHOOTING Failed time delay circuit It is possible for a voltage spike, etc. to cause the time delay module to fail: if this happens the switch will no longer transfer. If the AC input to the control board PCB1 is available and the LED does not light after 20 to 25 seconds, the time delay function in the module has failed, and the module will be required to be replaced. -
Page 14: Specifications
SPECIFICATIONS Model STS-30 Input / output voltage 120 VAC, 60 Hz Input / output current 30 A* Battery charger receptacle Dual NEMA5-15R 5 A max 12 A continuous Fused at 15 A Knockouts for 1” and ¾” Maximum operating time of the relay... -
Page 15: Warranty
WARRANTY 2 YEAR Limited Warranty The STS-30 Transfer Switch manufactured by Samlex America, Inc. (the “Warrantor“) is warranted to be free from defects in workmanship and materials under normal use and service. This warranty is in effect for 2 years from the date of purchase by the user (the “Purchaser“). - Page 16 e-mail: samlex@samlexamerica.com 110-17 Fawcett Rd T: 604 525 3836 Coquitlam, B.C. F: 604 525 5221 website: www.samlexamerica.com Canada V3K 6V2...
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