Instruction manual

STP-200/300/400 Series Instruction Manual
4.1.3 Inside of the STP Control Unit
(See Figure 4.3.)
(19) Fuses 2 to 5
・ These fuses protect as follows:
F2 : 125 V, 8 A (for control power protection)
F3 : 250 V, 3 A
(for inverter and air cooling fan protection)
F4 : 250 V, 5 A (for control power protection)
F5 : 125 V, 10 A
(for internal and external batteries protection)
(20) Inverter
・ This is a three-phase transistor-inverter which starts/stops the STP
pump.
(21) Internal Battery
・ For backup during a power failure.
(22) Internal Battery Connector
・ For connection of internal battery (When using an internal battery,
connect it to this connector).
・ The internal battery has been installed upon shipment of the STP
control unit so that the customer can use it (The internal battery
connector is connected to the internal battery).
◇ When using an external battery, disconnect the internal battery
connector, then connect the external battery connector
(See Section 10, "External Battery" for details).
(23) Control Circuit Boards
・ For control of the magnetic bearing, motor, safety functions, and
others.
4-5