3 - 12
Load Function Test
Immediately after the installation has been completed run a brief load function test to
confirm that the load bank has been installed correctly and that it is fully operational.
This involves running the load bank for a few minutes with a load applied. If the load bank
operates normally without any errors and the fan rotates in the correct direction then you
are ready to proceed with your testing program.
1. Connect a supply of the correct voltage and frequency to the external fan and control
supply. (See page 3 - 5).
2. Set the HV instrumentation switch to the HV setting. (See page 2 - 11).
3. Connect supply on test cables to the RMU.
WARNING -DO NOT ENERGISE YET.
4. Check the RMU is closed and the container doors are closed and secure.
5. As the control circuit power is applied, check that both the Start and Reset button
indicator lamps illuminate during the lamp test. The Start lamp should go out after a
few seconds, leaving the Reset lamp on steadily.
6. Check the voltage, current and power readings are as expected and that none of the
load bank indicator lamps are flashing.
7. Press the Start button. The Start button indicator will illuminate and the Reset button
indicator will go out.
8. Apply HV Power source.
9. Now apply some load. You can do this using the Sigma PC Load Control Software.
10. Check the voltage, current and power readings are as expected and that none of the
load bank indicator lamps are flashing.
11. Check the direction of the fan as it is rotating. Movable load banks are fitted with
automatic phase rotation sensors and will adjust the direction of rotation accordingly.
On static units the fan may run in the reverse direction if the phases are wired in the
wrong sequence. Cold air should be drawn over the fan motor and through the element
pack. If the fan rotation is incorrect, switch off and isolate the load bank before making
any alterations.
12. Remove the load (press the
O button on the Hand-held, or select <0> if you are using
the control panel).
The fan(s) should be allowed to run on for a few minutes until the equipment has cooled.
If a problem occurs during the load function test the Sigma controller may shut the load
bank down and the Reset button will flash. Refer to Chapter Five for further advice.
Chapter Three
Note: Attempting to
energise the HV power
source without the main
cargo doors closed
will result in the RMU
tripping.
