Deif SGC 420 User Manual page 52

operates until the timer for the site battery expires. If the genset starts as a response to the condition of the shelter
temperature, then the genset operates until the timer for the shelter temperature expires. If the shelter temperature is more
than the high shelter temp set point when the timer expires, the DG run duration timer starts again. The genset continues to
operate until the shelter temperature is OK.
When the mains returns or the DG run duration timer expires, the controller synchronises the mains breaker to the busbar
when the Return to mains delay timer has expired. The genset cools and then stops.
Partially healthy
This function also supports a partially healthy function for the mains. If the partially healthy function is enabled, then a
mains failure is not detected when one or two of the phases fail. The mains continues to supply power through the available
phase(s).
Mains failure occurs only when all three phases fail. When a mains failure occurs, the controller starts the genset if:
1. The site battery voltage is less than the set point for low voltage or
2. The shelter temperature is more than the set point for high shelter temperature or
3. Items 1 or 2 occurs when the mains is partially healthy.
Go to Mains > Configuration and tick the box next to Partial Healthy Detection tp enable the partially healthy function.
NOTE It is recommended to keep Mains monitoring enabled when you monitor the site battery and to use the Shelter
temperature sensor input only when Site monitoring is enabled.
Site battery monitoring parameters
Module > Site Battery Monitoring
Parameter
Battery Monitoring
Low Voltage Threshold
Battery Monitoring Delay 5 to 300 s
Genset Run Duration
High shelter temperature parameters
To monitor the shelter temperature in site battery mode, go to Analogue Inputs > S1 Sensor, and set Use Input As
Shelter Temperature Sensor.
Analogue inputs > S1 Sensor > Shelter Temperature Sensor
Parameter
High Temp Threshold
Shelter Temp Hysteresis
Shelter Temp Monitoring
Delay
User manual 4189341341B EN
Range
Enable
Disable
12 to 60 V
1 to 720 min
Range
25 to 300 °C
1 to 100 °C
5 to 300 s
Default
Not enabled
60 V
20 s
270 min
Default
60 °C
5 °C
10 s
Description
Select to enable this function.
If the battery voltage is less than this set
point, then the battery is not OK and
cannot supply the load.
If the battery voltage is less than the low
voltage set point when the timer expires,
the battery voltage is not OK.
The genset operates for this time
duration when the battery voltage is not
OK.
Description
Genset starts when the shelter
temperature is more than this set point.
If the shelter temperature hysteresis is
less than this set point when the genset
is operating, the controller stops the
genset.
If the shelter temperature is more than
the high temperature set point when the
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