Good news for TDC 2000 users concerned about extending the life of their Hiway! Yamatake has developed and is now shipping a new replacement voltage regulator for all TDC 2000 Hiway boxes. This initial product represents Yamatake's first step in a continuing commitment to support the TDC 2000 through at least 2025.
Honeywell notified Hiway users years ago of the importance of maintaining good voltage regulation in Hiway boxes. Aging electrolytic capacitors on the original voltage regulator can cause the regulator to product excess ripple in the DC output, which at sufficient magnitude can cause unpredictable erroneous behavior in the box. Diagnostic error codes may point to a failure elsewhere in the box. A faulty regulator can cause erroneous Hiway commands which can corrupt data in another controller on the Hiway.
The VREG by Yamatake is designed using the latest technology in power regulation. A check of the output voltage using a scope shows a very stable, clean output for all voltage levels - no ripple, no switching spikes.
Unlike the original voltage regulators used in TDC 2000 equipment, the VREG requires no periodic adjustments, and no other maintenance or calibration. The higher efficiency of this state-of-the-art design reduces power dissipation and runs cooler in the chassis, reducing the heat load for the cabinet. Note the absence of the large heat sinks used in previous regulator designs.