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4.2.2.4 Dry Contacts
There are 4 dry contact sockets on the Interface Board. The relays can be programmable from
Relay
Functions
menu (under
Settings
menu). “General alarm, Input failure, Battery
failure, Output failure, Bypass
active, Output overload, High temperature” alarms can be assigned to the contacts. Each alarm can be
assigned to separate relays but also one alarm may be assigned to all relays.
Each output socket 3-pin and middle pin is fixed, the upper pin is normally closed and lower pin is normally
open.
You may see the relay numbers as above.
Free contact relay connection cables shall have a cross-section of 1.5 mm
2
.
Maximum allowed resistive contact currents for several voltages are given on the table below:
Applied voltage
Maximum contact current for resistive load
Up to 42 VAC
16 A
Up to 20 VDC
16 A
30 VDC
6 A
40 VDC
2 A
50 VDC
1 A
60 VDC
0.8 A
Each relay has both a normally open (NO) and a normally closed (NC) contact. One end of these contacts is
common.
Relay functions are described below:
Relay
Default Function
Relay 1
General Alarm
Relay 2
Input failure
Relay 3
Battery failure
Relay 4
Output failure
Relay functions can be changed through front panel.
Maximum voltage to be applied to the relay contacts is 42VAC rms (sinus) or 60VDC.
Maximum contact current depends on the applied voltage and the load characteristic. Both
maximum voltage and maximum contact current corresponding to the applied voltage shall
not be exceeded.
1 2 3 4
