M4557 - Model 9210 Nitriding Controller
RAMPR This opcode changes the temperature setpoint at the rate specified in deg/min. The option data is the ramp rate in degrees/minute. The temperature data specifies the final setpoint for the temperature setpoint.
RESET This opcode is used to clear all stacks and timers and starts a program. The temperature data is interpreted as a program number and the atmosphere data as a program step. The option data is not used. The RESET is useful in a weekend shut down program to restart the normal operating program.
SET_AUX The Set Auxiliary Instrument Setpoint opcode is used with other instruments in the process such as flow control or belt speed. The temperature data is the setpoint and the option data is the instrument number.
SET_BP This opcode is used to set the backpressure set point. The atmosphere data is the atmosphere setpoint. The options are None, Wait up & Wait down
SET_FCM This opcode sets the gas flow control mode. There are four options: Individual trim, Flow control
adjusts two valves, Ratio control – Maintains constant ratio between NH3 +, Auto switch – Switches between Options 1 & 2 based on the DA switch point.
•Individual Trim will adjust the Gas flow of a valve if Trim is enabled.
•Flow Control adjusts the flows of all enabled valves by the same percentage.
•Ratio Control maintains a constant total flow of gas into the furnace by adjusting only the Ammonia and Dissociated Ammonia flows. This does not apply to the Nitrogen or Aux Valves.
SET_FACT This opcode is used to set the CO factor or the H2 factor of the atmosphere controller. If the atmosphere type for the loop is set to dew point then the H2 factor is set; otherwise the CO factor is set.
The temperature data is not used.
The atmosphere data is used as the factor with decimal places ignored.
The option data is wait, wait up, or wait down. This allows the control loop to recover from the change before continuing the program.
SET_WAIT This opcode sets the band limits for the wait option or inquiry opcodes. The temperature data
specifies the temperature band ( i.e. +/- the value) and the atmosphere data specifies the atmosphere band.
SETPT This opcode is used to set the temperature and/or atmosphere setpoints. Either or both of the setpoints can be specified. The options are None, Wait up or Wait down. If both setpoints are specified the Wait applies to both.
SOAK This opcode is an unconditional soak for the time (in hours and minutes) specified in the option data.
TC_INQ The temperature inquiry is used to wait for the actual control temperature to reach the specified temperature setpoint.
The options are:
•wait, reach within band;
•wait up, reach or exceed the setpoint;
•or wait down, reach or be less than the setpoint.
SSi Manual SERIES | Page 46 of 46 |
