MULTI-MODE MAINS MODULE
BURST FIRED OR PHASE ANGLE
ZAX27A
X10646
INSTALLATION
L
N
Connections Shown For Manual Control
1
8
9
13
10
12
ZAX 27A
10K
5K
POT
0V
5V DC
0V
SW1
L
O
A
D
T2
T1
G
MODE SELECTION
SW1 (ON) = Phase Angle
SW1 (OFF) = Burst Fire
HS
FUSE
INTRODUCTION
The ZAX27A provides accurate and precise mains control in both burst fire or phase angle control modes of
operation. This printed circuit board firing circuit is capable of driving an external triac or thyristor pair power
devices for any load rating. Additional features also include an uncommitted op-amp, which may be used as an
error amplifier or comparator for or closed loop (feedback) control,
APPLICATIONS
Virtually all resistance heaters including ovens, electric furnaces, moulders, dryers, smelters, heating tapes,
stress relieving, space heating and heating mantles. This is unsuitable for use on inductive loads.
MAIN FEATURES
Dual mode control capability.
(phase angle OR burst fire)
Soft start delay function
Output overload & temperature protection
Current limit
Microprocessor control compatibility
5KV input and supply isolation
Suitable for slave firing triacs or SCR pairs
WARNING
1. This unit requires fusing. This should be a fast acting semiconductor-type (FF5A) fuse placed in series with the
LIVE (240V input) supply lead.
2. All HAZARDOUS LIVE terminals - isolate supply before commencing any installation work.
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