MainsPro, SW version 1.4, ©ComAp – January 2013
MainsPro Application Guide
immediately after the auxiliary power supply is turned on. If there are no failures detected by the unit
measurement, it is possible to provide Fault Reset by any of the mentioned means and so to put the
unit into fault-free operation. If the setpoint is set to DISABLED, the unit goes directly into the fail-free
state.
The purpose of this functionality is to allow automatic delayed return to mains in case that the mains is
completely lost and MainsPro unit is powered from the same mains voltage.
TEST mode
MainsPro provides a TEST mode, which enables phase-to-phase testing of 3-phase protective
features by single-phase power source.
The test mode may be activated by entering the init screen (entered by pressing the and
at the same time). Follow by button and then button. This will open the Test
mode activation screen.
Select Y to enter the TEST mode.
The voltage asymmetry protections are deactivated.
The following functions are fix-assigned to the appropriate relay outputs, regardless of their
actual assignment:
o Comm Trp Per to RE3
o f Sig to RE4
o U Sig to RE5
In TEST mode, the setpoint group TEST becomes visible. This group contains only one
setpoint – „Phase“. Use this setpoint to assign to which input is the 1-phase measurement
voltage source connected (U
A
, U
B
or U
C
).
All relevant protections are evaluated only in that phase, which is selected:
o If TEST/Phase = Ua, the following protective functions are evaluated:
Overvoltage and undervoltage on the U
A
terminals, with dual stage setting,
including the Alt parameters possibility
Overfrequency and underfrequency on the U
A
terminals, with dual stage
setting, including the Alt parameters possibility
Loss OF Mains protections on the U
A
terminals, with the Alt parameters
possibility
o If TEST/Phase = Ub or Uc, the following protective functions are evaluated:
Overvoltage and undervoltage on the appropriate terminals, with dual stage
setting, including the Alt parameters possibility
Please note: When testing on the terminals Ub and Uc, it is always
necessary, that the same measurement voltage as applied on terminals
Ub or Uc is also present at the terminals Ua. It is not used for testing
purposes, but serves for the internal synchronization of the
measurement process of the unit.
On the first measurement screen (homepage), the sign !!!TEST!!! is displayed in the bottom
line instead of the last trip information.
If any TRIP is performed during the TEST mode, no counters are incremented and the last trip
indication and timer is not affected.
In the TEST mode, it is possible to change setpoints, but some functionality, which is disabled
in the TEST mode (e.g. voltage asymmetry setting or assignment of f(RE)) is not active.
After return from the TEST mode, the unit goes back to its original setting including the
outputs assignment and the setpoint group TEST is hidden.
To return from the TEST mode:
Go to Test mode activation screen and select NO, or
Turn the unit off and on again, or
The unit goes back to the standard operation after 10 minutes from the last keyboard activity.
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