B1 Primary Ballast - Lamp 1

Regulates the power to Lamp 1.

This ballast is used to power the Low-power setting and also, additionally with Lamp 1 Secondary Ballast, for the High-power setting.

B2 Secondary Ballast - Lamp 1

Co-regulates the power to Lamp 1 with the Lamp 1 Primary Ballast while in the High-power setting.

B3 Primary Ballast - Lamp 2

This ballast is used to power the lamp in the Low-power setting and also, additionally with Lamp 2 secondary Ballast, for the High-power setting.

B4 Secondary Ballast - Lamp 2

Co-regulates the power to Lamp 2 Primary Ballast while in the High-power setting.

R1/R4 Lockout Relay - Lamp ½

If the Current (CR1/ CR2) do not detect any current draw by the lamps, the Lockout Relay is switched on and the system powers down.

R2/R5 Lamp Trigger Relay - Lamp 1

Once the Current Relays (CR/ CR2) are enabled and detect a draw by the lamps, the trigger Relays are switched on. These relays allow the Voltage Relay (VR1/ VR2) to begin monitoring the voltage for the lamps. The delay in turning on the Voltage Relays protects them from the voltage spike Ignitors (S1/ S2) use to start the lamps.

R3/R6 Choke Start Relay - Lamp 1

The Choke Start Relays are activated by the voltage Relays (VR1/ VR2) and are used to turn on the Airflow Override Timer (T1) and the Lamp's Ready Signals. It also forces the lamps to operate at High Power until it reaches a Ready condition no matter what the Lamp Power Selector Switch is set to.

R3/R6 Current Relay - Lamp 1
Recommended Setting: 1.5A

Comes on when lamp draws current (i.e., it is ignited). When the Lamp is on it draws current, if the Lamp tries to ignite but draws no current, this relay will not come on and a Lamp Failure will be reported. The Lamp Failure will only occur after the Lamp Start Timer (C2T/ C3T) has expired which normally allows enough time for the Lamp to ignite. SPDI Part Number: MB-CR-115

VR1/ VR2 Voltage Relay - Lamp 1
Recommended Setting: 5

The Voltage Relay is used to indicate that Lamp has reached its operating voltage (normally between 250 and 300 volts). This relay is also used to turn on the Cooling Blower System which should maintain the lamp at its correct operating voltage. SPDI Part Number: MB-VR-115

C2T/ C3T Lamp Start Timer - Lamp 1
Recommended Setting: 4S

This is the time after which the Current Relay (CR1/ CR2) starts to take its measurements to see if the lamps are drawing any current. This delay allows the lamps time to ignite before indicating a Lamp Failure. Sometimes this is a separate timer labeled CON2T/ CON3T.

T1 Override Timer
Recommended Setting: 9S

This Timer is activated when either R3 or R6 (Choke Start Relays) come on. This timer acts as a delay in turning on the Pressure Sensor in order to give the Blower enough time to ramp up to speed and pressurize the Irradiator. The Pressure Sensor Relays will power down the system if there is no pressure once the lamps are ready. SPDI Part Number: MB-TM-1

T2 Delay Start Timer
Recommended Setting: 60S

This timer is used to lock out a re-start once the printer is turned off. This ensures the lamps have enough time to cool down. SPDI Part Number: MB-TM-23

T2 Blower Run On Timer
Recommended Setting: 60S

This determines the length of time the blower remains on aster the lamps have been powered down in order to cool them sufficiently ready for a re-start. Sometimes this is referred to as the Cool Down Cycle. SPDI Part Number: MB-TM-23

PR Cooling Pressure Switch Relay

If the pressure sensor in the UV Irradiator senses enough pressure to keep the lamps adequately cooled, the Cooling Pressure Switch Relay remains on and so the system remains powered. If the pressure in the UV irradiator drops, the relay will switch off and so power down the system and prevent the lamps from any overheating damage. SPDI Part Number: MB-IS-115

S1/ S2 Ignitor - Lamp 1/ 2

Provides the high-voltage spike needed to ignite the lamps. SPDI Part Number: MB-IG-3500

C1 Cooling Blower Contractor

Used to switch on the power to the cooling blower, which is used to cool the UV Lamps. It is activated by timer T3 (Blower Run On Timer) when the Cooling Fan Selector Switch is set to RUN, or it can be activated manually when the switch is set to TEST.

CAP Lamp Run Capacitors
Recommended Setting: >40µf

The capacitors are used to ensure a smooth power flow to the lamps. Capacitors are very important and are often overlooked in routine maintenance. A faulty capacitor can easily be mistaken for many other problems that often occur within a UV system. The recommended setting given here is for a High- Powered 45µf capacitor. SPDI Part Number: MB-CP-45

C2/ C3 Lamp Contactor - Lamp 1/ 2

Allows power to flow to the lamps, via the BALLASTS, the CAPACITORS, and the IGNITORS.

C4/ C5 High Power Contactor - Lamp 1/ 2

Enables power to flow to the Secondary Ballast (B2/ B4), which in turn increases the power output to the lamp. This contactor (and so the Secondary Ballast) only comes on when High-Power is selected or during the lamp's Power Up.