Stulz Mini-Space DX CCD131A, Original Instructions Manual

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/09.2016/ electric_MS EN
Second Power Supply, incorporated in electric box (for size 2 only)
This option provides the connection of a second power supply. Both power supplies are switched on to the A/C unit.
A contactor circuit ensures that the priority is set on power supply 1.
All three phases of both power supplies are checked constantly on excess voltage, undervoltage, phase failure,
phase balance and correct rotation. In case of failure of supply 1 the unit is switched off. After a lapse of time which
can be set at the time relay (preadjusted: 10 seconds) power supply 2 is switched onto the unit. The unit starts by
the automatic restart which is integrated in the controller.
When the voltage of power supply returns, the unit is switched off again. On a second time relay a delay can be set
(preadjusted: 10 seconds), after which power supply 1 is switched onto the unit. The unit starts by the automatic restart.
Three Phase Control
The phase monitoring relay monitors a phase failure and a phase reversal. Excess voltage, undervoltage and the
phase imbalance are monitored in relation to the set values.
In case of a phase failure the phase monitoring relay is de-energized without delay and triggers an alarm. If the moni-
toring relay detects a wrong phase sequence during the A/C unit start, it is not energized and prevents the unit start.
You can adjust a triggering delay on the relay for the errors excess voltage, undervoltage and phase imbalance
(excess of the adjusted limit values).
Automatic restart
When the defective phase returns and if the voltage is within the limit values and the phase imbalance within the
adjusted tolerance, the A/C unit is restarted automatically.
For this, the parameter "Phase restart" must be set to "1", either in the menu "Config/Values/Misc." of the C7000AT
or by the command "phase start 1".
12.5 Electrical Options
Error Adjustment range Factory setting
Excess voltage
(upper limit value)
off, 106-173% 108%
Undervoltage
(lower limit value)
off, 50-94% 92%
Phase imbalance off, 4 - 20% 5%
Triggering delay 0,1 - 20s 3s