Manual of SR258 intelligent controller
8
All sensor cables carry low voltage, and to avoid inductive effects, must not be laid close
to 230 volt or 400 volt cables (minimum separation of 100mm).
If external inductive effects are existed, e.g. from heavy current cables, overhead train
cables, transformer substations, radio and television devices, amateur radio stations,
microwave devices etc., then the cables to the sensors must be adequately shielded.
Sensor cables may be extended to
a maximum length of ca. 100 meter, when cable’s
length is up to 50m, and then 0.75mm
2
cable should be used. When cable’s length is up
to 100m, and then 1.5mm
2
cables should be used.
Output ports
FU1
：
2A/250V fuse
Input Ports L, N: for power connection, L: live wire, N: zero wire, protective wire
Output R1: Semiconductor relays (SCR), designed for pump speed control, Max.
Current: 1A
Output R2: Electromagnetic relays, designed for on/off control of pump or 3-ways
electromagnetic valve, Max. Current: 1A
Output R3: Electromagnetic relays, designed for on/off control of pump or 3-ways
electromagnetic valve, Max. Current: 2A
Output HR: Electromagnetic relays, designed for on/off control of after
heating/thermostat function, Max. Current: 10A
3.4 Connection with high efficiency pump
Connecting the signal wire from the high-efficiency pump
