HS2-04SB1 Intermittent Starter Resets

The HS2 starter employs a solid state relay in the common or 0volt line of the autotransformer.  If this relay shorts, then the relays can arc when operating.   An arc drawn by a relay contact will reset the microprocessor.  The simple way to check the solid state relay is to measure the voltage on the autotransformer during the first 5 clicks of the relays.  During the first 5 relay clicks, the solid state relay is held off so the autotransformer should not measure any real voltage on the input terminals (terminals 1 and 6 are about 220 VAC).

Note: See the note on HS2-04SB2

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HS2-04SB2 Starter Resets Immediately on Prep

Most often, one of the current transformers is shorted primary to secondary.  To isolate the shorted transformer, back out the tube select and safety board (CB513).   Put the starter in service mode (service jumper on the interface board CB515).

If the starter does not reset on prep, then check the transformers for possible short primary to secondary.

 

Note:  An open secondary on one of the three current transformers can cause resetting.

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HS2-04SB3 Starter Resets After Prep

During any start (low or high speed), the current in the common of the stator winding is monitored via the current transformer on the mother board.  If, for any reason the current is not there or not continuous, then the starter will halt. When Prep is released:  If in high speed, the starter will apply AC brake then recycle (as if turning the starter on).   This recycle after prep is a software indication that there was a problem with the current.  Most of the time this is caused by an inverter or inverter driver failure.

HS2-04SB4 Intermittent High Speed Starts

There are two likely suspects for intermittent high speed starting.

1. If the relays have an orange plastic indicator in the housing (the Schrack relays), remove them.  These can become dislodged and cause intermittent relay operation.

2. The inverter driver board (CB512) is intermittent.  Check for cracked solder joints and re-solder as necessary.  The blocking diodes on the driver board have been known to go bad (open intermittently with operation).  These are diodes in series with the current limiting resistors of the driver transistors.  They are typically labeled 'CR' on the schematic and 'D' on the board.  They are D3, D6, D9 and D10.  Replace with a 1N2005 or better.

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HS2-04SB5 Auto Transformer blows the protection fuse, makes sound like very heavy current draw.

The autotransformer rarely shorts.  The most common problem with excess current draw and or blowing the fuse is that the solid-state relay that switches the power to the autotransformer either half-waves or intermittently half waves.

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Recent Service Inquiries

• Recent Service Issues:

• The most recent and common failures is the Inverter Driver Board (CB510).  Diodes on the board have been failing.  It is highly suggested that you order a new Driver board along with the Inverter board should the inverter board need replacing.

Last Updated February 14, 2011