Operation Mode 0 To 2: One Valve Monitoring Per Machine Cycle; Operation Mode 3 To 8: Continuous Monitoring Of The Valve; Function Diagrams; General Information On Operating Modes - Dold SAFEMASTER BH 5904.02/00MF2 Betriebsanleitung

Operation Mode 0 to 2: One Valve Monitoring per Machine Cycle

At the beginning of a machine cycle the following conditions for the initial
state of the module have to be fulfilled, before the start signal of the safety
controller can activate the relays K1 and K2:
• The feed back circuit of the safety controller must be closed.
• The starting signal must be inactive.
• At the end of the previous cycle the valve has to have returned to it´s
initial position within the required time.
• The module must not show any stored fault.
The relays K1 and K2 are activated with the positive edge of the starting
signal of the controller.
The relaisy de-energise and the module locks out if the valve has not
reached it´s end position in the required maximum time or if the starting
signal is switched off before the valve has reached its end position. The
momentary state of the valve is indicated by the LED run1.
A started cycle is finished in all operating modes by interrupting the feed
back circuit.

Operation Mode 3 to 8: Continuous Monitoring Of The Valve

The valves are continuously monitored, and failures are only during
test cycles indicated by the semiconductor outputs 48 (release failure)
and 58 (starting failure). In the following cases the relays K1 and K2 are
de-energized or do not energise at all:
• If all signals except feed back circuit are not in initial state when auxiliary
supply is connected.
• If at the beginning of a machine cycle after the first activation by the
starting signal the valve does not reach the end state within adjusted
time. With the first activation the starting signal has to stay so long that
the end position can be indicated.
• If at the beginning of a machine cycle after the first activation by the
starting signal the valve does reach the end position and leaves this
position before the starting signal gets inactive.
• If at the end of a machine cycle (interruption of feed back circuit or,
when continuous monitoring, negative edge of the starting signal) the
valve does not go back into initial position.
• If the signal on S41-S42 does not correspond after max. 100 ms to the
state of the relays, when reinforcement of the contacts is selected.

Function Diagrams

A1/A2
start
feed back
circuit
K1/K2
valve
status
output
48
output
58
LED
run 1
LED
run 2
t start-1 <t max
t start-0 <t max
start test
monitoring
no signal monitoring
Operating modes without continuous valve monitoring (switch 10 = 0, 1 or 2)
Reset button
A reset button can be connected to terminals S33-S34 to reset the module
without disconnecting the supply voltage.
The reset requires pressing and releasing of the push button and all other
signals to be in initial state. Reset is only made if the push button is not
longer activated then 3 seconds.
Contact reinforcement
If more contacts are needed or higher currents have to be switched
then the unit can handle on K1, K2, the feed back contacts of external
contactors can be connected to terminals S41-S42 (2 NC contacts, see
pic. 2), which signal the status of these contactors to the BH 5904. The
BH 5904 monitors continuously if this input corresponds to the state fo
K1 and K2.
On failure (more then 100 ms after switching K1 and K2 no equivalent
status) K1 and K2 disconnect or do not energise at all. The module
BH 5904 can only be reset after removing of the failure by pressing the
reset button. Contact reinforcement is only available with functions having
continuous valve monitoring (switch 10 = 6, 7 and 8).
If contact reinforcement is not used, terminals S41-S42 remain open.
t max t max t max
permitted signal sequences after successful start monitoring, as long as feed back circuit is not interrupted
21

General Information on Operating Modes

t max t max
t max
t max
M8521_a
BH 5904.02/00MF2 / 26.01.21 de / 306A