GE CS300 - Manual (Page 20)

GEH-6639
——————— INSTRUCTION MANUAL ————————
20
Chapter 4 - CONTROL DESCRIPTION
4.1 OK RELAY
The OK relay has a normally open contact which close at the end of the precharging phase if no alarm condition
is present (overtemperature, power supply on the regulation card +/-15V).
The contact is closed during the normal functioning of the device and also during an undervoltage situation. The
contact opens when a failure occurs (see the alarm conditions described above) or when the power supply is
switched off and the DC-LINK is completely discharged (C and D terminals).
4.2 PRECHARGE ENABLING CONTROL
Such input allows to delay the precharging phase with respect to the moment in which the power supply (U,V,W
terminals) is applied.
The precharging phase occurs supplying terminals 23 to +24V (available on the terminal strip).
(common on terminal 52).
4.3 MLP SIGNAL
The MLP signal is a digital output available on the terminal 32.
This signal is a sum of the undervoltage threshold (via S2.1-3 set) and the precharging phase.
It will be LOW with a 0.5mS delay after the undervoltage threshold is reached. The digital output will be again
HIGH, at the end of the precharging phase. (This sequence is repeated at every mains dip)
(see chapter 6.2 figure B).
4.4 ML SIGNAL
The ML signal is a digital output available on terminal 36
It is the AC mains voltage monitoring.
With “CV” jumper mounted (on), the ML signal will be LOW when the undervoltage threshold is reached.
The digital output will be HIGH when the voltage is above the threshold (see the above table).
With “CV” jumper not mounted (off), the ML signal will indicate, with a 150mS pulse, an undervoltage value
transition.
When the voltage comes back above the threshold value, this will be not revealed by the ML signal.
(see chapter 6.2 figure B).