Safety
Information
Introduction
Product
Information
System
configuration
Mechanical
Installation
Electrical
Installation
Getting
Started
Basic
parameters
Running
the motor
Optimization
SMARTCARD
operation
Onboard
PLC
Advanced
parameters
Technical
Data
Diagnostics
UL Listing
Information
Unidrive SPM User Guide
69
Issue Number: 3 www.controltechniques.com
6.3 Output sharing choke specification
In order to achieve the best possible current sharing between paralleled
Unidrive SPM modules, sharing chokes must be installed between the
motor output connections and the drive’s motor connections.
Table 6-6 400V output sharing choke ratings
Table 6-7 600V output sharing choke ratings
6.3.1 Dual output sharing chokes
Table 6-8 400V dual output sharing choke ratings
Table 6-9 600V dual output sharing choke ratings
6.3.2 Cooling requirements for higher output
frequencies
Single OTL output sharing chokes - OTLX0X
Up to output frequencies of 300Hz, 1m/s airflow provides adequate
cooling.
Above 300Hz, the following equation must be used to calculate the
required airflow:
S = (f
0.75
/72)
Where:
S
is the airflow in metres per seconds
f
is the drive output frequency in Hz
Example:
Output frequency is 450Hz
S
= (450
0.75
/72)
= 1.4m/s
Dual OTL output sharing chokes - OTLX1X
The OTLX1X dual output sharing choke core does not see the change in
drive output frequency as this choke is a current cancelling choke. Only
the drives switching frequency has an effect on the core loss.
Therefore motor frequency is not an issue until higher frequencies cause
high copper losses due to skin effect.
Therefore with the dual OTL chokes, only 1m/s airflow is required.
Maximum output frequency for OTL chokes
The maximum allowable output frequency for OTL output sharing
chokes, singles or duals, should be limited to 1000Hz.
Model
Current
A
Inductance
μ
H
Width
(W)
mm
Depth
(D)
mm
Height
(H)
mm
Weight
kg
Max ambient
temp
°C
Min
airflow
m/s
Required
SPM module
Part No.
OTL401
221
40.1
240
220
210
20
50
1
SPMA/D 14X1 4401-0197
OTL402
267
34
242
220
205
20
50
1
SPMA/D 14X2 4401-0198
OTL403
313
28.5
242
220
205
25
50
1
SPMD 14X3
4401-0199
OTL404
378
23.9
242
220
205
25
50
1
SPMD 14X4
4401-0200
Model
Current
A
Inductance
μ
H
Width
(W)
mm
Depth
(D)
mm
Height
(H)
mm
Weight
kg
Max ambient
temp
°C
Min
airflow
m/s
Required
SPM module
Part No.
OTL601
135
103.9
242
170
203
20
50
1
SPMA/D 16X1 4401-0201
OTL602
156
81.8
242
170
203
20
50
1
SPMA/D 16X2 4401-0202
OTL603
181
70.1
242
200
203
20
50
1
SPMD 16X3
4401-0203
OTL604
207
59.2
242
200
203
20
50
1
SPMD 16X4
4401-0204
The OTLX1X parallel output sharing chokes can only be used
when two Unidrive SPM drives are paralleled together. For all
other combinations the OTLX0X output sharing choke must
be used.
Model
Current
A
Inductance
μ
H
Width
(W)
mm
Depth
(D)
mm
Height
(H)
mm
Weight
kg
Max ambient
temp
°C
Min
airflow
m/s
Part No.
OTL411
390
42.8
300
150
160
8
50
1
4401-0188
OTL412
470
36.7
300
150
160
8
50
1
4401-0189
OTL413
551
31.1
300
150
160
8
50
1
4401-0192
OTL414
665
26.6
300
150
160
9
50
1
4401-0186
Model
Current
A
Inductance
μ
H
Width
(W)
mm
Depth
(D)
mm
Height
(H)
mm
Weight
kg
Max ambient
temp
°C
Min
airflow
m/s
Part No.
OTL611
238
110.4
300
150
160
8
50
1
4401-0193
OTL612
274
88.4
300
150
160
8
50
1
4401-0194
OTL613
319
76.7
300
150
160
8
50
1
4401-0195
OTL614
365
65.7
300
150
160
8
50
1
4401-0196
CAUTION