Electronic Compartment Component Descriptions and Maintenance Procedures
2.2 Power Entry and Control Module
Additional Relay Outputs
Relay circuits LWH5 and LWH6 when used for purposes other than on/off control of low
wattage heaters can supply four separate outputs. A simple jumper on pins 1 to 2 on output
connector TB7 or TB8 makes this possible. With the jumper in place, each connector will
provide two independent outputs; see the diagram below.
Solid
State
Relay
Figure 2-8
2.2.3.5
Oven Functions
Temperature Monitoring and Control
The PECM_CTL board has two temperature monitor and control channels for use with the high-
wattage heaters (HWH). Each channel includes;
● RTD input
● Mounting location and connector for
setpoint module
● Comparator circuit
● PWM control signal output
The HWH control path is shown below.
24
Relay AC Supply Voltage
TB7 (LWH5)
or
TB8 (MWH)
LW5 & LW6 Relay Circuit Jumper Connections
Heater
A&B Common
Unused
AC Hot
SSRA Hot
AC Neutral A
Unused
SSRB Hot
To LWH Hot Load SSRB Load Hot
AC Neutral B
To LWH Neutral
● Control input (can accept an external
control signal from another module if
desired)
● Control output for HWH SSR module
● AC power output for HWH SSR
Usage
Sample
System Relays
SSRA Load Hot
SSRA Load Neutral
SSRB Load Neutral
Maxum II Reference Manual
Manual, 7/2017, 2000596-001