Basler ICRM-7 User manual

Publication
9387900990
Revision
A
First Printing: 02/05
Revised: 08/05
Copyright
2005
FOR
INRUSH CURRENT
REDUCTION MODULE
I
C
RM-7
,
I
C
RM-1
5
INTRODUCTION
The Inrush Current Reduction Module (ICRM) prevents damage to a protected voltage regulator during power-up
by limiting inrush current to a safe level. Without inrush protection, the inrush current is limited only by the level of
the power source impedance. The lower the impedance, the greater the risk of damaging the regulator from
excessive inrush current. Devices with a pulse-width modulated (PWM) power stage are especially vulnerable to
high inrush current due to a large amount of capacitance inherent to the design. However, voltage regulators that
use SCR-type power stages do not require the protection of an ICRM since these regulators do not have a large
amount of capacitance in the power stage.
When a voltage regulator with a PWM power stage is energized, the ICRM limits the inrush current by adding a
high level of resistance in series with the voltage regulator power input. Once the inrush current subsides, the
series resistance diminishes quickly to allow nominal, steady-state current flow.
APPLICATION
Applications where a voltage regulator is powered by a permanent magnet generator (PMG), auxiliary winding, or
generator output (shunt fed) usually do not require the protection of an ICRM. These sources usually have a
higher source impedance which inherently minimizes inrush current. Also, these sources are typically connected
directly to the voltage regulator with no interposing relays, contactors, or switches. If this is the case, then no
inrush occurs since the source voltage ramps up to its rated value.
However, if rated or near rated voltage is applied to the voltage regulator, then some amount of inrush current is
expected and an ICRM should be considered. Typically, voltage regulators in these applications receive power
from a station service bus that is switched by a relay or contactor. Applications where a PWM type voltage
regulator is powered by a low-impedance source need an ICRM to minimize the amount of inrush current.
To summarize, if the voltage that powers the voltage regulator ramps up to nominal as the generator comes up to
rated speed, then an ICRM is not needed. If this is not the case, an ICRM should be used. If you are unsure
whether your application requires an ICRM, contact Basler Electric Technical Sales Support for assistance.
ICRM Versions
Two versions of the ICRM are available. Each version is uniquely suited to protect a specific family of Basler
Electric products. Table 1 lists each ICRM model, its part number, and the compatible products.
Table 1. ICRM Cross-Reference
Model Number Part Number Compatible Products
ICRM-7 9387900103 DECS-100
ICRM-15 9387900104 AVC63-12, AVC125-10, DECS-200
SPECIFICATIONS
The following electrical and physical specifications, type tests, and certifications apply to the ICRM.
CAUTION
If operating power is removed from an energized ICRM, a minimum interval of
five minutes should elapse before operating power is restored. This cool-down
interval allows the ICRM to regain its ability to limit inrush current.

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First Printing: 02/05
Revised: 08/05
Revision
A
Publication
9387900990
Electrical Specifications
Input Voltage: 90 to 277 Vac, 90 to 300 Vdc
Input Frequency: dc, 50 to 420 Hz
Input Current
ICRM-7: 9 Aac
ICRM-15: 18 Aac
Power Dissipation: 25 W
Physical Specifications
Temperature
Operating: –25 to 70°C (–13 to 158°F)
Storage: –40 to 70°C (–40 to 158°F)
Dimensions: Refer to Figure 1
Weight: 227 g (8 oz)
Type Tests
Dielectric: Withstands 2,000 Vac for one minute in accordance with IEC 60255-5.
Shock: Withstands 15 G in three perpendicular planes in accordance with IEC 60255-21-1.
Vibration: Tested in accordance with IEC 60255-21-2. Withstands 2 G in each of three mutually
perpendicular axes, swept over the range of 10 to 500 Hz for a total of six sweeps, 15
minutes each sweep.
Humidity: Qualified to IEC 68-1, IEC 68-2-28.
Certifications
UL Recognition: cURus recognition per UL Standard 508 and CSA Standard C22.2 No. 14.
CE Qualification: This product meets or exceeds the standards required for distribution in the European
community.
INSTALLATION
The ICRM may be installed in any environment where the conditions do not exceed the capabilities listed in the
Specifications section.
Mounting
For maximum cooling, the ICRM should be mounted on a vertical surface and oriented so that the ventilation
holes are located at the top and bottom of the unit.
Figure 1 shows the ICRM mounting dimensions. Mounting dimensions are identical for both ICRM models.
Dimensions are shown in inches with millimeters in parenthesis.
Connections
Figure 2 illustrates typical connections for an application using single-phase operating power. The ICRM is not
phase sensitive. Figure 3 illustrates typical connections for an application using three-phase operating power.
Table 2 lists the terminal connections for each voltage regulator that is compatible with the ICRM.
Table 2. ICRM Terminals Cross-Reference
ICRM Output Terminals
Voltage Regulator A-OUT B-OUT C-OUT
AVC63-12, AVC125-10 26 28 30
DECS-100 3 4 5
DECS-200 C2 C3 C4
CAUTION
Case may become hot during operation.

Publication
9387900990
Revision
A
First Printing: 02/05
Revised: 08/05
Page
3
Wiring requirements are subject to the specifications of the voltage regulator. Refer to the appropriate device
instruction manual for wire sizing, fuse recommendations, and terminal designations.
TROUBLESHOOTING
The ICRM contains no serviceable components. Replacement of the ICRM is recommended in the event of a
failure.
If the protected device is not receiving operating power, check the following:
• Verify that the ICRM connections between the power source and voltage regulator are correct.
• Confirm that the voltage supplied by the power source is sufficient to energize the voltage regulator.
If operating power is applied to the input terminals of the ICRM but voltage is not present at the output terminals,
remove operating power, disconnect all ICRM wiring, and perform the following procedure.
1. Connect a suitable ohmmeter across the A-IN and A-OUT terminals. The resistance measured across the IN
and OUT terminals should be approximately 2.0 ohms for the ICRM-7 and 0.5 ohms for the ICRM-15. If an
open circuit or short circuit is detected, the ICRM should be replaced.
2. Repeat Step 1 for the B-IN and B-OUT pair of terminals and the C-IN and C-OUT pair of terminals.
Figure 1. ICRM Dimensions

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First Printing: 02/05
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Revision
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Publication
9387900990
Figure 2. Typical ICRM Connections, 1-Phase Operating Power
Figure 3. Typical ICRM Connections, 3-Phase Operating Power