172-65316M-08 (MB12A/MB12AF/MB12B/MB12BF) 7 Oct 2021
5
To prevent overheating of the motor unit, determine the minimum operation cycle
interval based on the ambient temperature from the graph below.
Ambient
Temperature Range
and Operation
Cycles
Ambient Temperature* (°C)
* Within one cm of cover
Operation cycle: The time for one cycle of opening and closing the
valve
A: Time to cycle from closed to open
B: Time to cycle from open to closed
Example:
When the ambient temperature is 40 °C and the medium in use is
steam, allow for an operation cycle interval of at least 36 seconds.
When the operation cycle interval is less than this, the thermal
protector may operate, causing operation to cease until the motor
temperature has fallen.
Specifications for No-voltage Contact Microswitch
Standard Model
Manufacturer
OMRON CORPORATION
Model
V-105-1A5-T
Contact Capacity
(Resistance Load)
15 to 250 V AC, 160 mA to 10 A
15 to 30 V DC, 160 mA to 6 A
15 to 125 V DC, 160 to 600 mA
Small-load Model
Manufacturer
Yamatake Corporation
Model
V-3214EK-011
Contact Capacity
(Resistance Load)
5 to 125 V AC, 5 to 100 mA
5 to 30 V DC, 5 to 100 mA
Operation Cycle
1.0 MPaG of Steam at 185 °C
Air at 20 °C
O
per
at
ion C
yc
le (
s)
