Ampcontrol MEC-1 - Operation Summary and Faults; DIP and Rotary Switch Settings; LED Indicators

Ampcontrol CSM Pty Ltd - ABN 35 000 770 141
ECDB006 MEC-1 User Manual
Rev 1 – MARCH/2020
MEC-1 USER MANUAL R0 13/03/2020 13:16 Page 15 of 18
7 OPERATION SUMMARY
7.1 DIP Switches Configuration
7.1.1 Remote Start
Switch Position
Function
Off (left)
Remote Start disabled. A remote start button (with a 100Ω resistor) must not be installed
On (right)
Remote Start Enabled. A remote start button (with a 100Ω resistor) must be installed
7.1.2 Latching
Switch Position
Function
Off (left)
Latching mode disabled. Trips will be automatically reset after the fault has been cleared.
On (right)
Latching mode enabled. Trips must be manually reset after the fault has been cleared.
7.2 Rotary Switches Configuration
7.2.1 Trip Level selection
The user can select the trip level via one of the rotary switches at the front of the unit. The trip level represents the threshold
for the series resistance. If the resistance is measured to be greater than this threshold ±3Ω, a trip will occur. The allowed
values for the trip level setting are 10Ω, 15Ω, 20Ω, 25Ω, 35Ω, and 45Ω.
The shunt resistance trip level is fixed at 1.25kΩ. A trip will occur if the pilot to earth resistance is detected to be below
this level.
7.2.2 Trip Time Selection
The user can select the trip time via one of the rotary switches at the front of the unit. The trip time represents the delay
after which a trip condition has occurred when the MEC-1 relay will de-energise. The allowed settings for the trip time are
50ms, 100ms, 200ms, 300ms, 400ms, and 500ms.
7.3 Indication LEDs
7.3.1 Status (Green)
LED state
Indication
Off
Power Off
Flashing
Power is ON and MEC-1 is running (relay contacts switched to the non-default state)
On
Power is ON but MEC-1 is not running (relay contacts in the default state)
7.3.2 Healthy (Green)
LED state
Indication
Off
Pilot is not healthy (series resistance above the selected setting or shunt resistance below
1.25kΩ)
Flashing
N/A
On
Pilot is healthy (series resistance below the selected setting and shunt resistance above
1.25kΩ)