SIM-Q MKII
Installation/operation instructions
DEIF A/S
Page 6 of 18
3
Installation
3.1
Connection
If a test function is wanted, an arrangement based on a resistor and a push-button can be
mounted as illustrated in the drawings below. The value of the resistor can be any value from 0
Ω
to the max. allowed insulation value. The SIM-Q MKII can be supplied from the IT system under
supervision, but it can also be supplied from another source, for example a 24 V DC source; see
the label for supply information.
The following functions can be selected by means of the switch that is available at the front of the
SIM-Q MKII: Monitoring, fault finding and test.
3-phase, AC
1-phase, AC
1-phase, DC
Recommended fuse size: max 2 A.
With the switch in monitoring mode, the SIM-Q MKII will run a fast measuring mode the first 15
seconds after a power-up. This mode can be used to perform a switchboard test. When a known
resistor is connected for testing, the auxiliary supply is disconnected and reconnected at the same
time (not shown in the illustration). The response time for measuring the known resistor will be
approximately 6 seconds. The two red LEDs will be illuminated, but the relay contact will not be
activated. After 15 seconds, the SIM-Q MKII automatically changes to normal monitoring mode.
As an alternative, the test can be carried out in fault finding mode. The response time will be 1
second, and if the set point is exceeded the relay output will be activated. If the switch is moved
to the “Test” position, an internal function test of the SIM-Q MKII is carried out. The reading on
the scale during the test is 0
Ω
, and the relay output is activated.
