240V Relay
KA1
E004P REL 230
KA1, which is switched by KA2 in a system fault situation, determines whether
Dual Stat-Element Stat 18kW or Housing-Element Stat Backup is live. This is
done by wiring one to KA1 normally open contacts and the other to KA1
normally closed contacts. KA1 will also signal a fault to the SMS device, and
close contacts to indicate a fault to the BMS at control panel terminals 14/15.
KA1 is in its de-energised state when the system is healthy. This allows
voltage to the Dual Stat-Element Stat 18kW through the NC connections.
When KA2 changes state due to a system fault then KA1 is energised. This
removes voltage from Dual Stat-Element Stat 18kW, and allows voltage to the
Housing-Element Stat Backup to activate the backup element.
When the system is healthy KA1 should be de-energised and KA2 should be
energised. When KA2 de-energises due to a fault with CB1 or Dual Stat-
Element OHS 18kW then KA1 should energise.
Part Name:
Wiring Diagram Key:
Adveco Part Number:
Function:
Specifics:
Correct Operation:
Testing:
1. With the power off, test continuity between terminal 21/22 of KA1. The correct reading is
closed circuit
.
Continue to test continuity between 21/22 while pressing in the orange test button. The correct reading is now
open circuit
. If the continuity does not change, is not correct, or the test button is stuck, replace KA1.
2. With the power off, test continuity between terminal 21/24 of KA1. The correct reading is
open circuit
.
Continue to test continuity between 21/24 while pressing in the orange test button. The correct reading is now
open circuit
. Repeat test for terminals 11/14. If the continuity does not change, is not correct, or the test button
is stuck, replace KA1.
3. With the power off test continuity between A2 of KA1 and the neutral of the isolator. The correct reading is
closed circuit
. If open circuit investigate the wiring.
4. With the power on and CB3 on, measure the voltage between 21/E and 31/E. The correct reading is 230V.
If 0V then test CB3.
5. With the power on, CB1 and CB3 on, measure the voltage between A1 and Earth. The correct reading is 0V.
If 230V, test CB1 Aux, Dual Stat-Element OHS 18kW, KA2.
6. With the power on, CB1 and CB3 on, and 0V at A1, measure the voltage between 32/E. The correct reading
is 230V. If 0V replace KA1.
7. With the power on, CB1 and CB3 on, and 0V at A1, measure the voltage between 24/E. The correct reading
is 0V. If 230V replace KA1.
8. With the power on, CB1 and CB3 on, and 0V at A1, trip CB1 and measure the voltage between A1 and Earth.
The correct reading is 230V. If 0V, test CB1 Aux, KA2.
9. With power on, CB3 on, CB1 tripped, and 230V at A1, measure the voltage between 32/E. The correct
reading is 0V. If 230V replace KA1.
10. With power on, CB3 on, CB1 tripped, and 230V at A1, measure the voltage between 24/E. The correct
reading is 230V. If 0V replace KA1.
33
EB0025-EB0028-EB0030 Control Panel -
Installation and maintenance manual
EB0028
3. Troubleshooting
