User Manual

Hardware IO connect
ion
Relay outputs
4
18 | 38 A6V1127616_en--_a
For POL461, the rated current for Q2 and Q3 is 3 A. use a 6.3 A fuse to protect the
controller from overheating.
For POL467 and POL468, the rated current for Q2 and Q3 is 5 A and is designed
to withstand high inrush current (7 to10 times of the rated current, for example
capacity load 40 A (100 us) ).
As a result, terminals Q2 and Q3 on POL467/468 can drive high efficiency devices
such as a pump or compressor within the specified rated current range.
● If Q2 and Q3 are used to drive high current devices, and Q4 is not powered
from the common of T11, a 10 A fuse can be used to protect the controller from
overheating.
● If Q4 is connected to the common of T11, the fuse F1 needs to be derated to
6.3 A to prevent the controller from overheating as Q4 is rated 3 A. In this case,
the Q2/Q3 should drive high-load devices with and external relay.
● We recommend to use varistors (MOV) or RC absorbers to protect devices or
individual relays with high capacitive or inductive loads connected to Q2 and
Q3. See the example below.
WARNING
●
Do not mix SELV/PELV and line voltage on the same terminal.
● Any compressor circuit, interference suppression, etc. must be provided
externally per the application.
● The indicated fuse rating does protect the controller from overheating and
burning in case of a failure. In such a fault condition, a relay might be
destroyed whereas the controller remains protected from entering a
dangerous condition. To protect the individual relays or connected devices,
other measures must be considered.
● Outputs must be separately fused if the connected loads are to be protected
or the common fuse needs derating.
● Use external protection for inductive load.
● AC 115/230 V cabling must have double insulation against cables carrying
safety extra
-
low voltage (SELV). The cables must be fixed by strain reliefs.