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PSR4/5 Power Supply Sizing
Danaher Motion’s Kollmorgen GOLDLINE® servos amplifiers perform as power converters
generating three-phase sine-wave current by pulse-width modulating a high voltage DC bus.
PSR4/5 Power Supplies produce DC bus, logic power, and shunt regeneration for one or more
BDS4 or BDS5 servo amplifiers.
The output power rating of the supply must exceed or equal the combined average power of all
servo drives operating simultaneously. Average power of an individual servo drive is based on a
power calculation of RMS torque and speed. The power supply output rating takes into account
losses and power factor such that no further derating is needed with respect to the motor output
power.
Output Power Rating Equations
N (RPM) x T (lb - ft)
7.04
Power (Watts) =
or
Watts =
N(RPM) x T (N - m)
9.55
PSR4/5 Power Supply Specifications
RTD
input
power
(KVA)
RTD
output
power
(kW)
Control
input
current
at 115
VAC 4763 Hz
Internal
dissipation
less regen,
(watts)
Standard
regen
Module
weight
lb (kg)
12
Main
input
current
peak
per
phase
(RMS) 2
sec
24
1.4
1.1
1.5
60
1
20
40
2.3
1.7
1.5
90
230
3
12
24
4.8
3.6
1.5
60
PSR4/5-220
230
3
20
40
8.0
6.0
1.5
90
PSR4/5-250
230
3
50
75
20.0
15.0
3.0
325
Internal 40
W
Internal 40
W
Internal 40
W
Internal
40W
External
PSR4/5-275
230
3
75
112
30.0
22.5
3.0
475
External
10.5
(4.77)
12
(5.45)
10.5
(4.77)
12
(5.45)
26.5
(12.1)
27
(12.03)
Model
AC line
input
voltage
+10 %
Number
of
phases
Main
input
current
cont.
per
phase
(RMS)
PSR4/5-112
115
1
PSR4/5 -120
115
PSR4/5-212
*See model number system for ratings of external regeneration modules
In addition to the power requirement, each power supply has a maximum axis configuration
based on logic supply requirements of individual BDS4 or BDS5 Amplifiers
Maximum Axis Configuration
Power supply model
PSR4/5-X12
PSR4/5-X20
PSR4/5-250
PSR4/5-275
Number of BDS4s (3 to 20
amp models)
4
4
8
8
Number of BDS4s (30 to 55
amp models)
6
6
Number of BDS5s
3
3
6
6
If the BDSs are mixed, the total number of axes that can be used would be the
maximum given for the BDS5s. Axis expansions limited to a maximum of 4
BDSs on either side of PSR4/5.
Regeneration Sizing
Shunt regeneration is required to dissipate energy pumped back into the DC bus during load
deceleration. The amount of shunt regeneration required is a function of the sum of
simultaneously decelerating loads. The loads need to be defined in terms of system inertia,
maximum speed, and deceleration time. In addition, the duty cycle must be known. The BDS
Regen Requirements Product Note details a calculation method to determine proper regeneration
sizing.
Transformer Sizing
PSR4/5 Power Supplies can be line connected to 3-phase 230-VAC power. Built-in soft-start
circuitry protects power supply components and eliminates nuisance tripping of breakers or fuse
blowing due to large in-rush currents. Transformers are required only for voltage matching
purposes. In this case, the transformer should have a 230-VAC 3 phase secondary and primary
voltage as required. The KVA rating of the transformer should take into account not only the
servo output load requirements but also losses in the system and power factor. The transformer
should have a KVA rating no less than the input KVA ration of the power supply if the full
supply ration is being utilized.
If the full output power of the power supply is not needed, the following calculation can be used:
KVA =
Load Power (watts)
.75 (1000)
Document Number: P-BD-700-1002
Revised 11/19/2003
Old Number (AB4000H)
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