Magnetek Quattro DC Elevator Drive Benutzerhandbuch

 

c.  Pre-charge contactor PCM is then 

pulled in.  This provides resistor limited 
inrush current to DC bus capacitors 
from AC mains and separate rectifier. 

1.  If a Drive or Drive Sequence Fault occurs 

the Drive will immediately open the motor 
contactor, de-energize the Brake Pick, 
Brake Hold, and Drive OK Relays if so 
programmed.  May be caused by: 

3.  DC bus is Pre-Charged 

a.  With pre-charge contactor PCM closed, 

separate resistor and rectifier circuits 
limit capacitor charging inrush current. 

a.  “Fatal Error” drive Faults including loss 

of serial communications 

b.  Bus voltage is monitored during pre-

charge to verify proper voltage build-up.  
(See 6.a. below) 

b.  Opening of the contactor power Safety 

circuit while the contactor is pulled in 

c.  Loss of correct motor contactor or 

Brake Relay feedback. 

c.  Target bus voltage is nominal input 

VAC (INPUT L-L VOLTS (A5)) X √2. 

2.  If an Alarm occurs, the drive will signal an 

Alarm but continue to run.  May be caused 
by: 

4.  Mains contactor is closed 

a.  As measured DC bus voltage nears 

target value main utility power contactor 
UTM closes. 

a.  Drive Alarms including motor overload, 

drive over temp warning 

b.  Aux contact feedback from UTM 

indicates to controls that main utility 
contactor is closed. 

b.  Loss of correct feedback from Brake 

Hold relay or Brake Switches 

c.  Open motor thermostat circuit 

c.  Then Pre-charge contactor PCM is 

opened.  (See 6.b. below) 

d.  Speed command is held at zero due to 

conflict with the analog speed 
command polarity and the run up/ run 
down logic 

5.  Boost converter is turned ON. 

a.  DC bus voltage is boosted to a higher 

level as programmed by the Boost 
Level parameter setting in order to 
achieve near unity power factor and low 
harmonic content of the Quattro drive. 

e.  Encoder Fault (C1) set to disabled 
f.  The drive is or was being limited by 

the motor torque limit setting (Hit 
Torque Limit) 

b.  Motor field controls also turn ON to 

begin regulating motor field current 
and/or operate main motor armature 
circuits. 

g.  Speed feedback is failing to properly 

track the speed reference (Speed Dev) 

h.  DC bus voltage drops below user 

specified percent of the input line to 
line voltage 

c.  The boost converter will remain ON as 

long as any field or armature current is 
being provided to the motor.  (See 6.c. 
below)  Time-out of the DSPR (Drive 
Stand-by Power Reduction) feature or 
other command may turn the Boost 
converter OFF when drive is idle 
although standby field will still be 
present.  In that case as new pre-
charge cycle must occur before drive 
re-start. 

When power is first applied to the Quattro 
drive, or after it has shut itself down via a 
DSPR time-out, the internal DC bus must be 
pre-charged before operation can resume.  
The following sequence will occur: 
1.  Power is applied to the Quattro drive 

a.  Control power may be applied before or 

after 3-phase main power 

b.  Some OEM drive versions may have a 

built-in control transformer 

6. Problem 

prevention 

a.  If DC bus voltage does not rise at the 

expected rate to the expected voltage 
level during pre-charge a “Charge 
Fault” is declared.  

c.  Drive controls should become active 

but no contactors should operate 

2.  Quattro drive receives command to 

‘energize’ 

b.  UTM and PCM are interlocked with aux 

contacts such that UTM cannot be 
picked unless PCM is already closed.  
Once picked, an aux contact of UTM 
seals the same circuit allowing PCM to 
be dropped with UTM remaining ON. 

a.  This command may be from serial link 

software or hardware logic command to 
deliver motor field current in 
preparation to start. 

b.  AC input voltage from mains is 

measured and verified to be adequate 
according to the setting of the VAC-
input adjustment parameter. 

c.  In the event of a major drive Fault, UTM 

will be opened to disconnect utility lines 
from main power devices of Quattro.  

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