Merseyside based food process plant supplier, Spooners Vicars is using
Allen Bradley Guardmaster's Prosafe range of trapped key interlocks to
ensure safe access via 32 doors on a 90m long triple hybrid continuous
bakery oven. Ovens of this kind include conveyors and microwave operation
in addition to more conventional heating systems, so safety is paramount
for bakery staff and maintenance operatives.
The access safety system comprises a rotary key switch (RKS) isolator
with electronic time delay, and 32 dual access trapped key interlocks.
Operating the RKS isolates the oven's electrical supply, initiating a
time delay to ensure that the microwave energy and resultant static
charges are dissipated before entry to the oven interior is enabled.
Upon expiry of the time delay, the isolator key is released and carried
some distance by the operator, finally being inserted into a special key
exchange unit with 38 removable keys, all identically coded, to fit any
door. If any of these keys is removed, the isolator key is trapped and
will remain so until all keys are returned to the key exchange unit. Only
then can power be restored to the oven.
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