Chapter 7 - System Description
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MNL000535
Revision 1
03/26/2018
BSGS eV / BULKGUARD eV
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
Confidential and Proprietary Data
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The optional J-T heater and heat trace zones are controlled by an AP1602 Thermal Control board via
thermocouple inputs and PID control supplied by proprietary onboard PID algorithms on the AP11.
The AP11 controller determines if the heater is above or below the operating setpoint, then sends an
appropriate digital signal to the SSR located in the eV ECC. Power is applied or removed from the
heated component as required via the SSR, and protected by a GFCB. The thermocouple signals are
monitored by alarm notifications. Low and high temperature alarms alert the operator to heater
temperatures outside normal operating conditions. A discrete hardwire shutdown circuit is provided
for the J-T heater that works off an imbedded temperature switch within the J-T heater. When the
switch trips, it opens the contactor and interrupts power from SSR to the J-T heater. Similarly, any
hardwired shutdown signal that occurs in the AP11 controller will also interrupt power from SSR to
not only the J-T heater, but also the heat trace zones.
J-T heater operating temperature setpoint and alarms are pre-programmed at the factory and should not
be adjusted in the field. Irreversible damage could occur to the equipment if the factory setpoint is
exceeded. Contact Versum Materials, Inc. DS&S Product Engineering before making any changes.
