KT-420-4 // PDF Download
58
L1
L2
L3
7
8
9
1
2
3
FI
FU
CF
Fig. 16: Motor terminals at the terminal plate for operation with external frequency inverter (FI) for reciprocating compressors with 40P motor
Reciprocating compressors with 40S motor
L1
L2
L3
U
V
W
Z
X
Y
FI
FU
CF
Fig. 17: Motor terminals at the terminal plate for operation with external frequency inverter (FI) for reciprocating compressors with 40S motor
Open drive BITZER reciprocating compressors are driven by external motors. For their motor terminals, see docu-
mentation by the motor manufacturer.
6.3
Voltage pulses at the motor terminals
The pulsed output voltage of a frequency inverter rises with a steep edge. The permissible range is indicated in the
figure below.
!
!
NOTICE
Risk of motor damage if voltage increase on motor terminals is too steep!
Observe the limits of voltage increase and voltage pulses at the motor terminals! If necessary, use sinus-
oidal filters.
t [µs]
3000
0
2500
2000
1500
1000
500
0
6
5
4
3
2
1
U [V]
1300
①
!
!
Limit
EN60034
based on
Fig. 18: Limits of voltage increase on motor terminals. White area: permissible range.
t: rise time
U: pulse voltage on motor terminals
①: limit based on EN60034
